Restriction

Steviemeaks · Post by **Steviemeaks** » Fri Dec 12, 2014 8:17 pm

What items restrict post august 77 bikes

fizzydoctor · Post by **fizzydoctor** » Sat Jan 03, 2015 1:09 pm

It is mainly the exhaust, which is reduced to 28mm from 32mm, if you fit the earlier one piece exhaust you should see some improvement

pertheswede · Post by **pertheswede** » Sat Jan 03, 2015 5:47 pm

There was also some restriction in the cylinder on the early UK FS1-E's (73-77). They went from having a 6hp "FS1" cylinder to a 4hp "F5B" one, which had worse porting etc

Steviemeaks · Post by **Steviemeaks** » Sun Jan 11, 2015 9:32 pm

Cheers for this lads helps a lot

Yamaha FS1-E Owners Club Forum

Restriction

Restriction

Re: Restriction

Re: Restriction

Re: Restriction