DECEMBER CPR KART-BEAT NEWS
Hi!
we're announcing the winner of the last bare chassis for November so head over to our Facebook page (click the picture below) to see who won! And you've guessed it - we're doing it again this month too! So if you missed out, get back on the horse and have another crack - To be in the draw for December's free Chassis, head over to our Facebook page and share the competition picture. It's drawn January 1 so HURRY, you'll get it just in time for Christmas!
NEW COMPLETE DIY RACING GO KART KITS
Our new range of CPR DIY Racing Go Kart Kits put you in the drivers seat for a fraction of the cost of other brand new racing go karts, but with maximum fun factor! Build it your way, by following our easy assembly guide. Enjoy the project fully and ensure you know exactly how to repair the kart in case of any mis-haps. There are several model options with or without engines depending on your intended use. In stock and ready to go right now! Delivered free of charge - of course!
NEW STICKER KITS
Our new range of CPR Performance Bodywork Sticker Kits make you look smart for a fraction of the price elsewhere. Professionally designed and produced, these kits are the perfect way to freshen up your kart. Available in CPR Red/Magenta and CPR Blue, to suit CPR PSCC1 and PSCC2 bodywork as well as CRG NA2. They are also very easy to adapt to almost any other bodywork. Why not freshen up your kart today? At just $99 delivered?!
NEW CPR PERFORMANCE BUILT ENGINES - IN STOCK!
Want the fastest engine at the track but without the fuss of building it yourself? WANT IT RIGHT NOW? Our CPR performance built engines are in stock and ready to go - in fact if you buy yours before 3pm today, it will go out on a courier today (assuming it's not a weekend or a public holiday).
That means you'll be winning races now, not in a few weeks!
Our Performance built engines have all the internal upgrades needed to ensure a strong reliable race motor, including billet con-rod, upgraded pistons, heavy duty valve springs, high lift and duration cam, re-worked genuine honda carbs and more. Plus you get all the external upgrades meaning you'll have an engine that looks trick, runs beautifully, and keeps you at the front time and time again.
Our engines have been designed to win Group 1 and 2 legally at Ipwsich in QLD but can be used wherever you like. You can view the full list of specs in engine product details page.
Click the picture above to view our range, and start winning races!
NEW 9 Keyway Ultimate Project Complete Axle Kits
It really is the easiest, most convenient way to set up your new project. With our new 9 keyway position axle you'll be able to position any of the hubs wherever you like, and you can even cut the shaft down significantly without running out of positions! Our complete hub to hub 40mm axle assembly offers every little nut and bolt required to complete a drive axle assembly on your project. The weld on brackets supplied allow quick and easy fitment of the bearing hangers, making the whole process a breeze.
If you're building a ride on mower, bar stool racer, wake boarding winch, a non-standard kart, off road buggy or anything requiring a driven rear axle then this little kit will have you laughing because you can use the time we save you making your dream project look awesome... oh, and you can also buy our kit in 5 different anodised colours! Gold, Blue, Red, Black and Silver!
Click the link above to get yours today!
Oh, and did I tell you we're throwing in a free Hydraulic Brake system as well? Yeah maybe I did.
BUY an Ultimate Project Complete Axle Kit & GET THIS FREE:
WIN! A BARE CHASSIS BY SHARING US ON FACEBOOK!
WANT TO KNOW WHEN NEW PRODUCTS ARRIVE?
Just 'like' our Facebook page and you'll see every new product update as it arrives. It's easy, just head across to our Facebook page and click 'Like this page' at the top of your screen. You can click the pictures above to view our page. Once you're done, you'll see Cut Price Racing product updates in your newsfeed! We won't spam your facebook account, because we only post when it's something important! If you don't have Facebook, don't worry, just sign up to our newsletters (scroll right down to the bottom of this email) and we'll try to keep you updated. Generally, our Facebook page is more accurate with stock because it's updated daily or weekly whereas our newsletter is compiled monthly.
FREE NOVEMBER GIVE-AWAYS! LOVE FREE STUFF.
Order over $50 in October and receive a free Digital Tyre Pressure gauge valued at $12.95! Get an Aluminium Flywheel for just $50 with any Upgraded Lifan 6.5hp (10+ hp) engine ENCLST1 valued at $159 - wow! That's a bargain! Avoid costly and potentially dangerous stock steel flywheel explosions for a tiny price. Buy one of our BRAND NEW ULTIMATE PROJECT Axle kits with 9 Keyway locations and everything you need to get any project up and running for just $429 and receive a free Hydraulic Brake Kit valued at $99! What a deal!
SHOP WITH US ON YOUR MOBILE PHONE OR iPAD
There has been so much demand from you all to get our site fully mobile phone compatible, so we've listened to you again and just launched our new mobile store so it's even easier to buy from us no matter where you are! It works great on mobile phones and iPads or android tablets too! So if you're at the track and don't want to forget to buy something, why not put your order through on the mobile store right where you stand, next to your kart where you can see exactly what you need?
NEW BANK ACCOUNT DETAILS
On 1 July 2013 our bank account details changed - if you're paying by bank transfer to ensure you use our new bank account details rather than the old ones. The correct bank details are listed on our invoices and in our store. To check them click the Westpac logo to the right.
WIN $100 GIFT VOUCHERS AT ARCHERFIELD, QLD
If you're in Brisbane, looking for an inexpensive place to race, try Barry's facility out at Archerfield Speedway - it's a sealed Bitumen track with a low daily one off fee and no compulsory annual licensing fees! There's a $100 Cut Price Racing Store Credit Gift Voucher up for grabs every race meet until January 2014, so if you want to be in the running, click the picture of the track below to learn more about Archerfield Raceway.
NEW CREDIT CARD FACILITIES
Once again you said you wanted credit card facilities, and we listened. We can now accept Visa and Mastercard on our website and over the phone. So if you've been putting of buying that part you need because we haven't had the convenient payment type you wanted, well now you can pay any way you like!
And we still accept PAYPAL and Bank Transfer for those who prefer those methods.
NEW HIGH QUALITY WET RIMS SET Bearing or Bolt on fronts
Don't be fooled by our crazy low prices, the finish and build quality of these rims are absolutely first class. And we've got a set no matter your kart type. Senior or Midget, bolt on or bearing fronts. They're all the same price, and they're all the finest quality. You simply can't go wrong with these rims! Seniors are 180mm wide rear, 130mm wide front. Midget are 130mm wide rear, 130mm wide front. Click the picture above to view our full range.
NEW PROJECT STUB & WHEEL KITS!
You can't go wrong with our range of project kits, complete with all necessary fabrication work for fast, easy, and simple connection and bolt-up of our components. Pictured above is our Complete Huffy Slider Conversion kit - and hopefully you'll be catching my drift - or yours!
And if you need something in the front, our Stub Axle (Spindle) Project kits will suit you perfectly! Click the link above to view our project 40mm rear axle kits, or click the link below to view our project spindle kits.
FAST DISPATCH SPEED MEANS FASTER POSTAGE!
CLEAN UP ON RACE DAY - CLEAN LIKE A BOSS!
NOVEMBER CPR KART-BEAT NEWS
GUIDE - PROJECT GEARING SELECTION
GEARING UP
#35 Gearing Explained
INTRODUCTION - About this guide
You can also read this guide on our website by clicking here.
When customers choose #35 pitch gearing (which we highly recommend for projects due to the 2-piece split sprockets and removable link chains – see our chain guide for more information) I am often asked the question “What is the inside diameter of your split sprocket?” and “What is the outside diameter of an x tooth sprocket” so I’ve decided to write this informative but straight-forward guide focussed on explaining what needs to be done to fit our standard race kart sprockets and gearing your project.
Generally, when gearing your project, you have 3 problems to overcome.
1. Fitting the sprocket to your axle
2. Ensuring the overall sprocket size does not foul on the ground or chassis
3. Selecting a practical starting gear ratio
This guide will run you through the decision making process as well as provide technical details on the products so that you can decide if #35 race kart gearing is suitable for your project. I’ll run through these three sections quickly but informatively in the hope I don’t bore you, but that you have easy access to the information needed to get it right the first time.
PART 1 - Fitting the sprocket to your axle
Our #35 sprockets are a split sprocket which is ideal in situations where the sprocket is driven ‘inboard’ on the axle (ie: between the axle bearings). They are easy to remove and install making gearing a breeze to get correct, or to change out a worn sprocket.
You can find our full range here: http://www.cutpriceracing.com.au/store/home.php?cat=351
The centre bore size A is 116mm.
The PCD Diameter(B) is (6x) 132mm (centre of 6mm holes on opposite sides of sprocket)
All standard race-kart sprocket hubs will accept our sprockets. We can supply sprocket hubs to fit most metric shaft sizes – 25mm, 30mm, 35mm, 40mm.
You can find sprocket hubs to suit here (Click your axle size and keyway width to find your hub):
25mm/6mm, 30mm/6mm, 30mm/8mm, 35mm/6mm, 35mm/8mm, 40mm/8mm
The hubs will accept the sprocket perfectly. All you need to do is slide it onto your shaft. Select the correct size shaft version of the sprocket. If you have an imperial size shaft, we cannot offer a solution, but some people have successfully adapted the metric hubs to an imperial shaft.
PART 2 – Ensuring the overall sprocket size does not foul on the ground or chassis
Your new #35 sprocket will differ in sizing depending on the number of teeth you have chosen. Circumference will determine the number of teeth you will have. The reason the size differs is because the pitch of the chain determines the length required for one full link or tooth.
For those uninterested in the math, please skip this paragraph. #35 pitch is 9.525mm, so for every tooth, the circumference must be increased by 9.525mm. In addition, the height of each tooth is about 5mm so we need to add approximately 2.5mm extra from the centreline of each tooth (or approximately 5mm to the diameter) This means we have a formula #TEETH x 9.525mm = Pi x Diameter. Or we could write it as #teeth x 9.525mm divided by Pi = Diameter plus 5mm. Translating back to diameter, our smallest sprocket (53T) has a diameter of 53 x 9.525 / Pi (3.141592) = 166mm.
Your chain will sit around 3mm proud of the tip of each tooth, so you’ll need to add approximately 6mm to the diameter of the sprocket to get the correct clearance amount.
Here’s a table of diameters:
#Teeth
Dia mm
Dia w/chain mm
53
166
172
54
169
175
55
172
178
56
175
181
57
178
184
58
181
187
59
184
190
60
187
193
61
190
196
62
193
199
63
196
202
64
199
205
65
202
208
66
205
211
67
208
214
68
211
217
69
214
220
70
217
223
71
220
226
72
223
229
73
226
232
74
229
235
75
232
238
76
235
241
77
238
244
78
241
247
79
244
250
80
247
253
81
250
256
82
253
259
83
256
262
84
259
265
85
262
268
PART 3 – Selecting a practical gear ratio
Once you’ve determined your limitations in relation to ground and chassis clearances, the next step is to determine the best gear ratio. There are several things to consider, including:
- Desired Acceleration
- Desired Top Speed
- Minimum operating speed
o One of the most important considerations is the minimum ‘fully engaged’ clutch speed. Most stock clutches engage around 2000rpm. With a governed 4-stroke engine, that means you have a working range of somewhere between 2000 and 3500rpm. If you select too tall gearing, and you constantly operate the kart at speeds which bring the motor close to or below the 2000rpm engagement point, you will encounter clutch problems as the clutch is continually slipping.
The following table gives approximate speeds for gearing. It is recommended not to use gearing in the orange sections, and red sections will almost certainly result in mechanical failure.
Tall gearing (lower ratios) may struggle to gain rpm if the power of the engine is not enough to overcome the torque of the axle. This is more pronounced the larger the wheels are, so bear this in mind.
Always select the shortest gearing (highest ratio) first and work your way down with rear sprocket sizing to ensure you do not damage your clutch and that you can ensure your project will get mobile initially.
Min = Minimum cruising speed @ 2000rpm (clutch fully engaged)
Max = Maximum speed @ 3500rpm (governed)
Max (last column) = Maximum speed @ 7000rpm (un-governed)
Senior rear rims & slicks 11x7.10-5 265mm dia 832.52
Sprocket Sprocket Final 2000 3500 7000
Clutch Rear Ratio Min Max Max
12 53 4.42 23 40 79
12 54 4.50 22 39 78
12 55 4.58 22 38 76
12 56 4.67 21 37 75
12 57 4.75 21 37 74
12 58 4.83 21 36 72
12 59 4.92 20 36 71
12 60 5.00 20 35 70
12 61 5.08 20 34 69
12 62 5.17 19 34 68
12 63 5.25 19 33 67
12 64 5.33 19 33 66
12 65 5.42 18 32 65
12 66 5.50 18 32 64
12 67 5.58 18 31 63
12 68 5.67 18 31 62
12 69 5.75 17 30 61
12 70 5.83 17 30 60
12 71 5.92 17 30 59
12 72 6.00 17 29 58
12 73 6.08 16 29 57
12 74 6.17 16 28 57
12 75 6.25 16 28 56
12 76 6.33 16 28 55
12 77 6.42 16 27 54
12 78 6.50 15 27 54
12 79 6.58 15 27 53
12 80 6.67 15 26 52
12 81 6.75 15 26 52
12 82 6.83 15 26 51
12 83 6.92 14 25 51
12 84 7.00 14 25 50
12 85 7.08 14 25 49
13 53 4.08 25 43 86
13 54 4.15 24 42 84
13 55 4.23 24 41 83
13 56 4.31 23 41 81
13 57 4.38 23 40 80
13 58 4.46 22 39 78
13 59 4.54 22 39 77
13 60 4.62 22 38 76
13 61 4.69 21 37 75
13 62 4.77 21 37 73
13 63 4.85 21 36 72
13 64 4.92 20 36 71
13 65 5.00 20 35 70
13 66 5.08 20 34 69
13 67 5.15 19 34 68
13 68 5.23 19 33 67
13 69 5.31 19 33 66
13 70 5.38 19 32 65
13 71 5.46 18 32 64
13 72 5.54 18 32 63
13 73 5.62 18 31 62
13 74 5.69 18 31 61
13 75 5.77 17 30 61
13 76 5.85 17 30 60
13 77 5.92 17 30 59
13 78 6.00 17 29 58
13 79 6.08 16 29 58
13 80 6.15 16 28 57
13 81 6.23 16 28 56
13 82 6.31 16 28 55
13 83 6.38 16 27 55
13 84 6.46 15 27 54
13 85 6.54 15 27 53
18 53 2.94 34 59 119
18 54 3.00 33 58 117
18 55 3.06 33 57 114
18 56 3.11 32 56 112
18 57 3.17 32 55 110
18 58 3.22 31 54 109
18 59 3.28 30 53 107
18 60 3.33 30 52 105
18 61 3.39 29 52 103
18 62 3.44 29 51 102
18 63 3.50 29 50 100
18 64 3.56 28 49 98
18 65 3.61 28 48 97
18 66 3.67 27 48 95
18 67 3.72 27 47 94
18 68 3.78 26 46 93
18 69 3.83 26 46 91
18 70 3.89 26 45 90
18 71 3.94 25 44 89
18 72 4.00 25 44 87
18 73 4.06 25 43 86
18 74 4.11 24 43 85
18 75 4.17 24 42 84
18 76 4.22 24 41 83
18 77 4.28 23 41 82
18 78 4.33 23 40 81
18 79 4.39 23 40 80
18 80 4.44 22 39 79
18 81 4.50 22 39 78
18 82 4.56 22 38 77
18 83 4.61 22 38 76
18 84 4.67 21 37 75
18 85 4.72 21 37 74
Not Recommended
(either gearing too tall, or sprocket diameter too close to ground)
Certain damage to drivetrain (too tall gearing or sprocket fouls)
13" Off-Road wheels 13x5.00-6 290mm dia 911.06
Sprocket Sprocket Final 2000 3500 7000
Clutch Rear Ratio Min Max Max
12 53 4.42 25 43 87
12 54 4.50 24 43 85
12 55 4.58 24 42 83
12 56 4.67 23 41 82
12 57 4.75 23 40 81
12 58 4.83 23 40 79
12 59 4.92 22 39 78
12 60 5.00 22 38 77
12 61 5.08 22 38 75
12 62 5.17 21 37 74
12 63 5.25 21 36 73
12 64 5.33 20 36 72
12 65 5.42 20 35 71
12 66 5.50 20 35 70
12 67 5.58 20 34 69
12 68 5.67 19 34 68
12 69 5.75 19 33 67
12 70 5.83 19 33 66
12 71 5.92 18 32 65
12 72 6.00 18 32 64
12 73 6.08 18 31 63
12 74 6.17 18 31 62
12 75 6.25 17 31 61
12 76 6.33 17 30 60
12 77 6.42 17 30 60
12 78 6.50 17 29 59
12 79 6.58 17 29 58
12 80 6.67 16 29 57
12 81 6.75 16 28 57
12 82 6.83 16 28 56
12 83 6.92 16 28 55
12 84 7.00 16 27 55
12 85 7.08 15 27 54
13 53 4.08 27 47 94
13 54 4.15 26 46 92
13 55 4.23 26 45 90
13 56 4.31 25 44 89
13 57 4.38 25 44 87
13 58 4.46 25 43 86
13 59 4.54 24 42 84
13 60 4.62 24 41 83
13 61 4.69 23 41 82
13 62 4.77 23 40 80
13 63 4.85 23 39 79
13 64 4.92 22 39 78
13 65 5.00 22 38 77
13 66 5.08 22 38 75
13 67 5.15 21 37 74
13 68 5.23 21 37 73
13 69 5.31 21 36 72
13 70 5.38 20 36 71
13 71 5.46 20 35 70
13 72 5.54 20 35 69
13 73 5.62 19 34 68
13 74 5.69 19 34 67
13 75 5.77 19 33 66
13 76 5.85 19 33 65
13 77 5.92 18 32 65
13 78 6.00 18 32 64
13 79 6.08 18 31 63
13 80 6.15 18 31 62
13 81 6.23 18 31 61
13 82 6.31 17 30 61
13 83 6.38 17 30 60
13 84 6.46 17 30 59
13 85 6.54 17 29 59
18 53 2.94 37 65 130
18 54 3.00 36 64 128
18 55 3.06 36 63 125
18 56 3.11 35 61 123
18 57 3.17 35 60 121
18 58 3.22 34 59 119
18 59 3.28 33 58 117
18 60 3.33 33 57 115
18 61 3.39 32 56 113
18 62 3.44 32 56 111
18 63 3.50 31 55 109
18 64 3.56 31 54 108
18 65 3.61 30 53 106
18 66 3.67 30 52 104
18 67 3.72 29 51 103
18 68 3.78 29 51 101
18 69 3.83 29 50 100
18 70 3.89 28 49 98
18 71 3.94 28 49 97
18 72 4.00 27 48 96
18 73 4.06 27 47 94
18 74 4.11 27 47 93
18 75 4.17 26 46 92
18 76 4.22 26 45 91
18 77 4.28 26 45 89
18 78 4.33 25 44 88
18 79 4.39 25 44 87
18 80 4.44 25 43 86
18 81 4.50 24 43 85
18 82 4.56 24 42 84
18 83 4.61 24 41 83
18 84 4.67 23 41 82
18 85 4.72 23 41 81
And remember, we're here to help you get out there racing!
You can always be sure your items will leave the same day you order as long as you've made payment by 3pm that day. Sure, it's a big claim, but I know shopping online is all about getting it before the weekend race day, and that's why I'm absolutely dedicated to getting our gear out the same day you order. I believe so strongly that this is a critical component of our business that I've devoted the last two hours of the day to ensuring just that. Don't be surprised if I can't get to the phone during these times as we're probably flat out! Just leave me a message and I'll call you back asap.
I know if you've bought from us before, you've had a great experience. Nothing's changed with our focus - we still want to help the average Australian race, but we're expanding our range every day so I'd love for you to check out our latest website updates and see if we can help you again, today. Go on, visit our store at http://www.CutPriceRacing.com.au - I mean, surely you've got a couple of minutes for fun?
Cheers,
Paul Jones
Managing Director
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E&OE. Offer ends 30/11/13 or if stock sold out. Prices subject to change without notice.