How is an fs1 engine restricted ?

[Candygold16]

Any information on the restriction of an fs1 engine would be very helpful !

Is it the exhaust ?
The bore ?
The jet or other component in the carb ?
The sprockets ??
And if it is the carb components where can i get upgrades to fit the mikuni carb ??

Thanks
Candygold16

[allspeed]

Any information on the restriction of an fs1 engine would be very helpful !

Is it the exhaust ?
The bore ?
The jet or other component in the carb ?
The sprockets ??
And if it is the carb components where can i get upgrades to fit the mikuni carb ??

Thanks
Candygold16

Fs1(non pedal)
The down pipe is 28mm instead of 32mm,the two peice standard exhaust has a small diameter tube running through it.
The gearing is 13/39 instead of 14/39
The carb is not restricted and the Main jet is the same size
The port timing slighltly milder,how ever i have tried both barrells back to back and the difference isnt worth worrying about.
You fit a one peice pattern pipe and a 14 front sprocket and it gives round 45mph,

[garyb]

and theres a small pipe in the disc valve cover that weakens the mix Tedward lets in air

at least i fink thts what it does cant see any other reason for it?

[fizzydoctor]

and theres a small pipe in the disc valve cover that weakens the mix Tedward lets in air

at least i fink thts what it does cant see any other reason for it?

Thats where the oil comes in from the autolube pump you only get air coming in when your oil runs out

[allspeed]

and theres a small pipe in the disc valve cover that weakens the mix Tedward lets in air

at least i fink thts what it does cant see any other reason for it?

Nope thats not a restriction,thats where the oil pump feed pipe connects on the autolube bikes.It must be blocked off if using pre-mix

[Candygold16]

When you say the gearing is that another word for like the ratio of the sprockets ?
Thanks for all of youre help guys !
Candygold16

[allspeed]

Yes, 14 front 39 rear on pedal models,restricted 13 front 39 rear.Same ratios inside the gearbox on both models.Bear in mind though the engines probably ben messed with anyway,most are.

[garyb]

and theres a small pipe in the disc valve cover that weakens the mix Tedward lets in air

at least i fink thts what it does cant see any other reason for it?

Nope thats not a restriction,thats where the oil pump feed pipe connects on the autolube bikes.It must be blocked off if using pre-mix

so it is what a doughnut, thats why i dont have a restricted bugger