39mm Keihin FCR flatslides

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Jaffa
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39mm Keihin FCR flatslides

Post by Jaffa »

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
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Post by davemfox2 »

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

Dave
1993 YZF 750 SP with Yoshimura half system
RG400
GSXR 1100WT

Jaffa
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Post by Jaffa »

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

Yoniboi
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Post by Yoniboi »

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.
If you're going to take a shot at me let me know so I can duck...!

sbutler
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Post by sbutler »

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.
96 GSXR 750 racer gone
90 GSXR 750 racer gone
ZRX 1200 Roady to enjoy.
Retired TeamExup racer.

Jaffa
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Post by Jaffa »

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

sbutler
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Post by sbutler »

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.
96 GSXR 750 racer gone
90 GSXR 750 racer gone
ZRX 1200 Roady to enjoy.
Retired TeamExup racer.

sickle44
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Post by sickle44 »

RETIRE??

Your not retiring from Racing are you Steve??
Michael
Yes Yes I know, I said, I'm building a project YZF1070

Basement is done now, 850 finished and gone...
Gotta get the new siding up on the house.
Fixing the FZ1 up, cleaning up garage and then I might even begin

spook
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Post by spook »

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
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Post by sbutler »

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. :poke
96 GSXR 750 racer gone
90 GSXR 750 racer gone
ZRX 1200 Roady to enjoy.
Retired TeamExup racer.

sickle44
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Post by sickle44 »

:cheers

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.
Michael
Yes Yes I know, I said, I'm building a project YZF1070

Basement is done now, 850 finished and gone...
Gotta get the new siding up on the house.
Fixing the FZ1 up, cleaning up garage and then I might even begin

sbutler
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Post by sbutler »

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..
96 GSXR 750 racer gone
90 GSXR 750 racer gone
ZRX 1200 Roady to enjoy.
Retired TeamExup racer.

sickle44
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Post by sickle44 »

Well then,

Like I said, :cheers, here here!
Michael
Yes Yes I know, I said, I'm building a project YZF1070

Basement is done now, 850 finished and gone...
Gotta get the new siding up on the house.
Fixing the FZ1 up, cleaning up garage and then I might even begin

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