39mm Keihin FCR flatslides

Jaffa · Post by **Jaffa** » Tue Sep 20, 2011 9:18 pm

I have a set of 39mm flatslide carbs off an OWO1 fitted to my YZF 750 using a 1/4 turn quick action throttle.
Problem is the throttle action is very heavy.
OK for short races of 5 or 6 laps but longer races are a struggle.
Any suggestions to make the throttle lighter?
Stuart

davemfox2 · Post by **davemfox2** » Tue Sep 20, 2011 11:13 pm

Trace the cables make sure it's a free run, lubricate the cables, check the action on the carbs is not sticking etc..

Dave

Jaffa · Post by **Jaffa** » Tue Sep 20, 2011 11:23 pm

New cables, no kinks, action smooth and not sticking.
It seems the spring is just too strong to close the slides.
Stuart

Yoniboi · Post by **Yoniboi** » Wed Sep 21, 2011 7:40 am

You're just going to have to look for a different twist grip and go for one with a greater leverage/ longer pull. That, or try finding some lighter springs. Iff you're using a two cable throttle the spring shouldn't need to be that stiff (as you're closing the throttle with the return cable), Different story on a dirt bike, one cable, system where the spring is the only thing closing the slides when you back off on the gas.

sbutler · Post by **sbutler** » Thu Sep 22, 2011 3:08 am

I agree, I think a different throttle tube & some lighter springs. I run the standard tube & softer springs on my flats & it works well. Give that a try matey..
Regards Steve.

Jaffa · Post by **Jaffa** » Thu Sep 22, 2011 9:03 pm

Steve,
Where did you get your lighter springs from?
Congratulations on winning Retro class in St George by the way.
Regards
Stuart

sbutler · Post by **sbutler** » Wed Sep 28, 2011 2:23 am

Jaffa wrote:Steve,
Where did you get your lighter springs from?
Congratulations on winning Retro class in St George by the way.
Regards
Stuart

Thanks it was great to retire on a good note thats for sure.
Try any car accessary shop has a huge range of springs Stu. Give them a go you'll find one for sure, just take your with you & you will be able to feel the differance.

sickle44 · Post by **sickle44** » Wed Sep 28, 2011 11:29 am

RETIRE??

Your not retiring from Racing are you Steve??

spook · Post by **spook** » Wed Sep 28, 2011 5:43 pm

sickle44 wrote:Your not retiring from Racing are you Steve??

Racing is like smoking, you never give up...you only stop. The urge will be always there.

You serious Steve????

sbutler · Post by **sbutler** » Thu Sep 29, 2011 3:10 am

Yes guys Im retired, I think it was time. I have had enough [for now]
I still have the P6 GSXR which I will sell at some stage. I have to do a couple of things first, & if I still have the it, I might have a trott at the Barry Sheene meeting, just for a laugh, but that will be about it. Nothing serious of corse?
Unless we get an invite to support the world superbikes at Phillip island, I wouldnt mind have a gallop around there on something with only 110hp. Should be nice & safe.

sickle44 · Post by **sickle44** » Thu Sep 29, 2011 10:36 am

Well then, if you can't be encouraged back on to the track,

Here, here, ............ To Mr. Butler then.....

I sure hope you aren't letting a scare keep you off, just saying because of the 110hp comment.

sbutler · Post by **sbutler** » Fri Sep 30, 2011 12:39 am

No mate, I just felt it was time I hung up the leathers. Ive done everything & more than I wanted to do in my return to racing. So after winning the Retro Championship, I felt it was just a good time to go.
Like I said, If I still have the 1990 GSXR I might have a wobble at the Barry Sheene meeting, but I even doubt that. You know when the time comes & It did for me. So for now its relax back & rest a while..

sickle44 · Post by **sickle44** » Sat Oct 01, 2011 1:57 pm

Well then,

Like I said,

, here here!