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Sean_McCutcheon

motocrossing with Z-start and no perch adjuster

29 posts in this topic

I have a yz450f with the z-start and I am using the external adjuster right now. I am planning on doing a my first motocross race on the 24th of April. I was wondering how people are doing on the starts without the perch adjuster which lets you use the clutch to get your RPM's up. I am afraid that I won't get as good of start without the clutch. After the start I will not need the perch adjuster anymore. I have only ridden in the woods so far and so no need for the clutch lever. I know the start is very important in a motocross race especially since there are a lot of people in my class that are at the same level as me as far as speed on the track. So it is important to do well on the start. I have the perch adjuster, but don't want to put it on.

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I had the same problem and it was very difficult to get a start, so now I am useing the clutch lever and I seem to be doing great! Without the lever it is very very tough! :)

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Jason, how did your clutch work this past weekend? Did you resolve your issues with it?

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Renegade, I did do much much better, I found the preassure plate and throwout to be rubbing on the inside of my clutch cover and actually wearing a deep groove in it. So Sean is going to send me another gasket. I just hope that the clutch cover is not weakened from the grooves. I filed down the throwout as per Sean, but the preasure plate is still rubbing, hopfully the gasket will do the trick!!!! :)

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Jason, you're not the only YZF owner who just recently had this rubbing problem! Keep an eye on the clutch cover, and if it becomes a problem, I recommend you give the guys at rekluse a call.

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This is the first time I've heard of this problem. I guess I better take my cover off tonight and inspect. I can't remember if mine had two or three gaskets.

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I do have the same wear marks especially the center and the two on the right and left!!!!! :)

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I got three with mine I had not noticed any marks. But one thing I was figuring was why the gaskets, why not a spacer instead?

Then I figured Production cost :)

BUt I would pay a bit more for a spacer instead.

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Mine came w/2 gaskets only though I would imagine they are sending out 3 now.

Just me or wouldn't the clutch basically be limited (via cover/rekluse interference) to slipping like a bastage? :)

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Just me or wouldn't the clutch basically be limited (via cover/rekluse interference) to slipping like a bastage? :)

Yes, because the throwout's travel was limited after the clutch warmed up. Due to heat expansion, the throwout 'bottomed' against the cover and reduced the effective clutch pressure. That situation could lead to excessive slippage, and a very toasty clutch pack.

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Ego/John, EFM sells an aluminum spacer made by Cometic, it is approximately 3/8" thick so it will be much more than 3 gaskets. It does increase oil capacity though. :)

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The generation 1 and 2 z-starts came with an aluminum spacer instead of the cometic gaskets. I retained that when I upgraded to the gen 3 product. I don't think I have anywhere near the clearance issues you YZF fella's are having.

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Yes, because the throwout's travel was limited after the clutch warmed up. Due to heat expansion, the throwout 'bottomed' against the cover and reduced the effective clutch pressure. That situation could lead to excessive slippage, and a very toasty clutch pack.

This = toasty?

clutch

clutch 2

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Mine are almost that bad I hope this gasket cures the problems because I have been fooling with this clutch alot! :)

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This = toasty?

Color is an indicator, but what you really want are flat 'steels' and non-glazed frictions with plenty of meat on them. A new clutch pack couldn't hurt. Cheap insurance. :)

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A new clutch pack couldn't hurt. Cheap insurance. :D

mo money

mo problems

:)

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im new to the auto clutch, do i understand correctly, i can chug down to a stop, without the beast stalling, just gas and go?? like a honda 50 for example, and/ or pull the clutch for fast starts. that would be a huge bonus for me, i keep stalling the sucker going too slow in technical stuff.

would a flywheel weight be any advantage if i had the rekluse? ?

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