bender 88 yamaha exciter, no power,please help

J

jayp13601

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Joined
Mar 15, 2004
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3
it idles just fine , but on the stand i can only get about 6 grand out of it, just wont seem to come into it. if im on it it will go for a little bit then bog out if i let off it will idle again, untill you sit for a min then it'll go a little more. if i stay on it it will just quit .tried cranck seals.seems to be gettin enough fuel.this does have a pipe , clutch, filters and bender racing did modify and tune it while the previous owner had it.but it did sit for a couple years .one time for about 5 min i actually got to ride it
 

carb tuning

My wife had an 87 exciter, that after getting it "tuned up", the needle jets were clipped in the wrong position, and the sled road good for a few miles and after it warmed up, it would bog down and not have any power. After adjusting the needle jets position, it ran like it had before the "tune up."
 
:twisted: Had a problem like that on my old kawasaki and it drove me nuts for years, I know not the same brand but it ended up to be my stator.Sounds exactly like the same problem but could be a number of thing. Still have that kawasaki and still ride it once in awhile BOY! when that sled was running good it was unbeatable (1978) fast for a 440 liquid and one of the first liquids in their time. sorry for going on but brought back old times,I think I might go out and fire her up, maybe next year I plan on riding tomorrow. :twisted: :twisted: :lol: :lol:
 
:twisted: Sorry jay start with a compression test and do the basics first. clean the carbs ect, it sat for years so do the basics. Did you get a book with this sled to do your own work?Check over sled and someone will try to help. Never had that sled but heard they had problems with pistons. :twisted:
 
They didn't have problems with pistons, they had problems with carbs. The first problem with the original butterfly carbs was a finnicky-starting issue - you had to pull the choke, then pull the string until it kicked ONCE (one pull), then drop the choke to nothing and pull twice more. Due to customer complaints, the carbs were updated to round-slides - this introduced an even WORSE problem... at certain RPMs, the round-slide carbs would resonate and cause the gas in the bowls to cold-boil - this caused an increase in the bowl pressure, which prevented new gas from being pumped in, and caused the jets to suck on bubbles, causing severe lean condition which would burn the pistons.

I have an '87 Exciter that I've owned for 7 years. I think its got about 50000 miles on it, of which I put on about 15000. I've had to rebuild the top end ONCE, due to one of the pistons wearing way beyond its limit and snagging on an exhaust port on a down stroke. Other than the damage caused by that, both pistons were in PERFECT condition. In the last couple of years, its become my "sleeper", having been replaced by RX1 :4STroke:.


So my advise to anyone with an 87-90 Exciter.... if its got round-slides, chuck-em and put on a pair of Mikuni B38-34's (which happen to be the same carbs as current model VK540 uses).
 
Not to hijack this post or anything but....I was always courious about why Yamaha used the butterflys on only the Phazers? That was why I always assumed that Phazers started so easy. Besides normal cleanings, I've never had a lick of problems with the carbs. Question #2, why doesn't Yamaha use a rack mount on the Exciters like they do a Phazer? Just wondering.... :shock:
 
To answer question 1: they all seem to start easy, except for 87 Exciter. The type of carbs are not nearly as important as the compatibility with the engine.

2: Exciter *did* have rack-mount carbs. When it still had butterfly valves. Slide carbs don't like to be hooked up in a rack since there is nothing turning between them--- they both need cables to pull straight up.
 
:Moon: HEY! BASTARD THEY DID HAVE PISTON PROBLEMS. I'm just trying to give the guy some advise and help, lighten up!!! Bastard does know his sh#$#t but the way he comes off kills me. Season is over now hope you figured it out and just maybe IIII was right, could have been a # of things but tell us if III was right . have a good summer. :o| :o|
 
me again

i think ive got it down to the carbs, there was 390 main jets in these things which seemed a bit big to me .so im trying 330 and 340 which seem to make it much better but its still not just pulling on the top end not much power after about 6 grand . could any one tell me how there carbs are set up . this is piped , ported, polished. or ill just have to try messin ,but it s really to warm now , idont know .
 
:? You should e-mail lazybastered for some info, he does know his stuff about this sh###t on this sled. Go to the member list and ask him what to do and what to use. Just don't want to see you dead in the snow come next year GOOD LUCK!!!! He is on the rx-1 forum of this board I am sure he will try to help and get that sled ripping again.
 
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