How easy is it to service an EXUP valve?

[Mad Dave]

Hi all,

My R1 has a big stuttery hole in the power delivery, but is fine once you get high up in the revs. Its been suggested to me that this is probably due to a jammed EXUP valve. So, does anyone know how easy this is to sort? Bike is an 03 R1.



Dave

[N Dentressangle]

http://www.cartestsoftware.com/fz1/exupmaintenance...

Any use?

[Mad Dave]

That looks perfect - thanks mate

[EvoBarry]

Mine seized up over winter, in the closed position...which mean 80mph tops and not exactly spritely getting there either. You're main issue is the bolts holding it on tbh Dave, if they crack off easily the rest is childsplay. Mine's sweet as a nut now and the bike hauls well.

[Mad Dave]

Cheers Barry. Mine's jammed open so i've got nothing low down but i've still got plenty of top end - you just have to wring it's neck I did Rockingham on it a few weeks ago which was interesting, trying to pull it up out of the low speed corners - either crawl out of them in 2nd or risk high siding at 12k rpm in 1st hehe

From looking at it today there are two assemblies which form part of the exup valve - one at the base of the downpipes and one behind the right hand side footpeg. I'm guessing the one on the downpipes is the one I need to get at and you're right, the bolts are going to be a bh - they're all corroded!

I'll have a bash at them next weekend if I get a chance

[EvoBarry]

Yeah, access to mine is best on the LHS of the down pipes, the cover comes off easily but the three allen bolts holding the valve in place are the b'stards. Had to drill one of mine out in the end, and thats pretty much what the dealers/engineers said was the usual outcome

The best suggestion I was given was to bin the whole thing and get a Yoshi full system

[accident]

no help at all
but i did the exup on my 2000 r1 and it all came apart no trouble at all.
some copper grease on the bearing and its all fine and has been for 10000 miles now.

[EvoBarry]

Mines an 03 Fazer1000 with 18k on it though, its seen some weather over the years and typically Yamaha used the lowest grade of metal possible with their fasteners :rollseyes:

[Mad Dave]

Is it FI? If so, its probably essentially the same lump as in my R1. Let's hope my EXUP valve comes apart easy enough

Thanks guys

Dave

[EvoBarry]

Nah, mines the Gen1 so the carb'd version