Bought the new ex27 robin engine.
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Doc Sprocket
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If all you are changing is the engine, top speed will remain the same (assuming both new and old engine are governed to spec 3600RPM, and gearing is appropriate). More detail is required.
Is there a way I can make it faster without fooling with the engine? do want to mess with the warranty on the engine.
r97
Measure twice cut once
Let us know your kart's rear tire OD (measured), the number of teeth on your axle sprocket, and the number of teeth on your jack-shaft sprocket. With that info we can get you the theoretical top speed of your kart. It's also worth mentioning that Subies are apparently factory set for 4000rpm, not 3600. Just so I don't have to look it up again later... the 40 series has a 1:1 high range and a 2.43:1 low range.
Adjusting the governor, or completely removing it can get you to speeds of about 5000-5500rpm, but either of those would likely be a violation of the warranty.
Adjusting the governor, or completely removing it can get you to speeds of about 5000-5500rpm, but either of those would likely be a violation of the warranty.
r97
Measure twice cut once
Rear tire diameter?
r97
Measure twice cut once
Theoretical top speed is now 40mph, expect 35 to 40. If you want to go faster your should try changing your gear ratio.
souperman000
New member
Change the number of teeth on your sprocket.
I would tell you how many, but I have never been good at gearing. (Does he need less teeth on the sprocket right?)
r97
Measure twice cut once
What kinds of speeds do you want (keep it reasonable)? What kind of terrain will you be riding on (street, grass fields, dirt trails, hills, sand, etc)? Estimate on weight of kart with passenger(s)?
souperman, the answer to your question depends on which sprocket were talking about, and if he wants to increase or decrease top speed.
souperman, the answer to your question depends on which sprocket were talking about, and if he wants to increase or decrease top speed.
Blazkowiez
Kart Aficionado
Think 35-40mph.
This is a good thing, your kart isn't designed for the speed you desire.
This is a good thing, your kart isn't designed for the speed you desire.
Blazkowiez
Kart Aficionado
A small list of parts on your kart which are improper for this speed:
Tires (NON HIGHWAY SERVICE, not built for that speed)
Tie rods and Ends - Pressed not machined
Spindles - Improper caster and camber
Wheels - Pressed not machined
Brakes - Work great at 30mph, however at greater speed are not adequate.
Wheelbase - too narrow and center of gravity is too high
So basically over 40 your eyes will water and you will start to violently shake followed by any sharp turn ending up flipping the kart.
r_chez_08
Should be in the shop...
Good advice blaz. However if you still want a little more speed then you can change your axle sprocket to say, a 54t one. I have a practically new one if you wanted to buy it. This would increase top speed from 36mph to 40mph.
I would not reccomend speeds faster than this in a yard kart
I would not reccomend speeds faster than this in a yard kart
But I have a 60t axle sprocket. wont a smaller one make top speed slower?
DeathStarr89
Loose Nut
No, faster top speed however it'll accelerate slower.
souperman000
New member
r_chez_08
Should be in the shop...
Deathstar is correct. However,. although acceleration will decrease, you have a good motor and clutch setup which should handle it.
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