yfz seems to have lost power... (updated)

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Aug 23, 2004 | 05:06 PM

#11

Hozed

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yfz sems to have lost power... valves???

Quote:

Originally posted by: stevendsm95gst
time for new rings?

that was my first thought.... but it starts right up and seems to run fine... i was told to check the vavles first.

Aug 23, 2004 | 06:23 PM

#12

patient

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yfz sems to have lost power... valves???

hi does anybody know the specs for these valves. Thanks

Aug 23, 2004 | 07:24 PM

#13

briansgi

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yfz sems to have lost power... valves???

Quote:

Originally posted by: Hozed
the past 2 times ive been out riding it just doesnt have the same power... i am hoping its the valves... i am told they tend to tighten up on these type of motors which would explain why i cant here them tapping... anyone else got some input???
it revs and starts up fine... but the power just aint there like it was.

Clutch possibly slipping??

Aug 23, 2004 | 08:49 PM

#14

thunderalley400ex

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yfz sems to have lost power... valves???

Even if it starts up fine it could still be fried rings. That is probley your problem...

Aug 24, 2004 | 02:41 AM

#15

Trinity748

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yfz sems to have lost power... valves???

How could the rings be gone already? he has only had it 5 months... That does'nt make any sense that the rings would be so worn at this point, unless there was a defect of some kind. Although i'm not sure what that would be.

Aug 24, 2004 | 03:14 AM

#16

deathmetal

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yfz sems to have lost power... valves???

How many hours do you have on it? Compression check?

Aug 24, 2004 | 07:13 AM

#17

Hozed

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yfz sems to have lost power... valves???

i am going to my dealer today... i tend to ride up near the rev limiter ALOT... so rings wouldnt surprise me... but i was told by a few guys who run dirtbikes that vavles will do the same thing... who knows...

Aug 29, 2004 | 09:10 AM

#18

Hozed

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yfz sems to have lost power... valves???

ok, ive checked my valves... intake needs to be between .004 - .006
i can just barely fit a .004 in them... and the exhuast needs to be .008 - .010 i can just barely fit an .008 in them.
the gauges slide in very tight and it take some wiggling on a few on them... but IMO this isnt off enough to make to much of a difference.
any input?

and if anyone knows how much compression these things are supose to have could you let me know, thanks.