powervalve/top end problem still!

[moff747]

I recently posted a question about the possibility of my power valve sticking. I have tried various jetting and have checked the movement of the power valve. I have good bottom end power and good mid to top, when it all works properly! as I said before bottom end power is consistant, It dosent seem to come on the pipe at WOT, at 3/4 throttle the power always come on and I can then roll the throttle fully open. Could it be the reeds? The plug gap? The problem is very anoying as the bike can be upredictable. The bike is 2002 ec 300 with fmf gnarly using 98ron fuel at 50:1 putoline mx5.

[Link]

Didn't see your other post but did the bike "come on the pipe" before or has the bike always ran this ? & do you meen unpredictable that the bike runs on the pipe sometimes and sometimes it dosn't?

[moff747]

I mean upredictable as somtimes it comes on the pipe and somtimes dosent. It does it mainly after a period of low revs or slow riding (no more than 1/4 throttle). Once the bike revs up cleanly and does come on the pipe (after playing with the throttle) it will go fine untill another period of loww revs.

[MattR]

It sounds like it is getting too much fuel and starts to load up. Then, you have to wait until it cleans out as you get on the throttle. I have been facing a similar dilema on my bike.

It definitely won't hurt to pull the reed valve assembly out and inspect it's condition. I just ordered some reeds for mine, since I noticed them not sealing on the manifold. Also, on black carbon fiber reeds, you can hold them up to some light and see if you light is passing through the fiber mesh. A couple of my reeds had light passing through (looks like pin holes). Both of these would let more fuel enter the chamber and richen the mix.

[GMP]

Matt,

The light test is not a very good way. The thin CF will show light through brand new reeds. Also the reeds may not touch the cage on all sides, but they should be very close. The main thing is that they are not frayed or delaminating on the edges. Mine looked perfect @ 46 hrs.

[moff747]

Ok, I will check my reeds when I get a chance. I havent checked them yet on this bike. If they seem ok but are a little curved can they be reversed to make them sit flat on the block? or is that not recomended.

[infected]

this sound so familiar... now that uve mentioned it, i am currently experiencing the same thing and i understand what u mean on the unpredictable part. if i were to ride 1/4 throttle for about 15 mins, and immediately have it wide open, i'll end up having a fouled plug. it is really that bad, to the extend that i cant use a B8EG or B8EGV or any iridium plugs during races cause it will only last the first few laps. it was frustrating at first but i somehow learnt to live with it. dunn get me wrong, but ive tried numerous jetting, changed the reeds a few times but its still the same. honestly i dunn think that the valve is sticking. i resent to the fact that maybe my bike is jus born this way and spent more time riding it with a spare plug on hand (of course!).. i sure will appreciate any help u guys could provide or any part that i may overlooked.

[kim]

Does this change with altitude or later in the day, even a slight bit.
I'm just trying to determine if it could be jetting and altitude and/or a slightly clogged airfilter does make some difference.

My bike used to do the same and it did change with different jet settings

Kim

[moff747]

I ride at the same altitude just above sea level. I have some Aktive T2 reeds to try. Has anyone used these? if I still have the problem I will try some re-jetting . It seems a 40 pilot is quite small going by what other people use in ec300's.

[kim]

Well, does the change of jetting make a difference on the way the bogging occurs, ie at different revs/throttle position ?

K