need more speed

[briggs33]

i just finished putting together my rupp continental. i put a 8hp briggs on it but i would like it to go faster. its running off the jackshaft so i was thinking about gearing it a different way but i wasnt sure. i already ported the block when i rebuilt it (back to stock) and no governer . does anybody have any ideas to what i can do to get more speed? its got plenty of torque

 

[jesse8931]

new carb or you can mess with your jetting

 

[briggs33]

i got a nine horse kawi motor and i could prob use the carb of that and how long does a staight pipe have to be to have the correct back pressure for the exhaust valve not to burn up?

 

[jesse8931]

a straight pipe isnt gonna have any

 

[briggs33]

thats what i was thinking but my friend was like yeah it does so idk but does anybody a tilly carb for sale cheap?

 

[briggs33]

oh and do i have to do mods if i put a tillotson carb on lie fuel pump or have to run alcohol...?

 

[kbs8ball]

goin fast is all about gearing... an 8hp properly geared should fly...if it has 12" tire a 72 tooth rear sprocket and a 12 tooth clutch..its only gonna go so fast...even if it has a v twin in it.

 

[kbs8ball]

its all in the MATH. :lol: ya should of learned this in school.

 

[jesse8931]

its all in the MATH. :lol: ya should of learned this in school.

thats why iam soo slow :doah:

 

[GTO]

Yep, change your gears. :thumbsup:

 

[briggs33]

ok i got a 14tooth clutch that goes down to a sprocket on a jackshaft then runs over to another sprocket which runs over to the rear hub and wheel (all on the same side) should i change the second sprocket connecting to the wheel?

 

[kbs8ball]

thats a big clutch...both my running bikes have 12 t clutches...need to know how many teeth on each sprocket on the JS and the sprocket on the rear wheel.

 

[GTO]

If you have a 1" shaft, it will be cheaper to keep the 14T clutch and change the size of the sproket from the clutch.

Usually you have a 12 T clutch going to something like a 18T to a 12T to the sprocket. Count your teeth on you JS sprockets you want to go with a smaller one coming of the clutch for more top end speed. Too small and you'll burn your clutch.