86 phaser rim problem

YZViper366

YZViper366

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Joined
Jun 23, 2011
Messages
349
Age
33
Location
Bismarck, ND
Ok I have a 86 phaser that's got a new top end, new crank seal this thing will start but I can't get it to rev up over 4000 rims what could be my problem I have checked for rub through and stuff in the wiring harness.

Could it be a stator? Ignition coils? Anything else? And how do I test this stuff?
 
I am having the same problem with my sons phazer. I have cleaned and checked clutches (springs,rollers ect. ) changed reeds changed plugs. Cleaned carbs. Did a compression test it's fine. It still does it. I also disconnected the tors and replugged them together. Any suggestions would be helpfull
 
guys check to make sure both rubber plugs are in the bottom of the carbs in the right places one should cover the pilot and the other the middle tube they must be soft and not rock hard too .....
 
Yamaha Nutz said:
guys check to make sure both rubber plugs are in the bottom of the carbs in the right places one should cover the pilot and the other the middle tube they must be soft and not rock hard too .....
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What do those rubber plugs do??. I remember when I did the carbs last they were in there. But I think they were a little hard.
 
they control the amount of fuel being drawn in by the pilot and by pass circuit if they are rock hard they are not sealing and letting excess fuel by causing a rich condition that you will see at about 3500 to 4000 rpm and up basically you can get a hole shot for about 30ft and then it will load up bad many times the sled will barley move
 
Yamaha Nutz said:
they control the amount of fuel being drawn in by the pilot and by pass circuit if they are rock hard they are not sealing and letting excess fuel by causing a rich condition that you will see at about 3500 to 4000 rpm and up basically you can get a hole shot for about 30ft and then it will load up bad many times the sled will barley move
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Are the rubber plugs still available threw a yami dealer. Might as well replace them if they are hard not soft correct. Is there any other thing I should check. The sled runs good at idle and to half throttle at cruising speed. But when hammered on it just won't rev.
 
Thanks for the part number staggs. I hope this takes care of the problem. My buddy said a guy around here had the the same problem. Pretty much changed everything and stil couldn't fig it out. Ended up selling it. I just hope I don't end up going that way. But don't now what else to try after these plugs in carbs if that don't work
 
the carb plugs is a good post!

you can check for this by running the sled and holding it wide open when it gets into that area its bogs down, let it kill the engine and pull out the spark plugs, they should be wet looking, youll confirm the extra fuel is leaking past the plugs and making for a over rich scenario. Its basicly like opening up the choke.
 
mrviper700 said:
the carb plugs is a good post!

you can check for this by running the sled and holding it wide open when it gets into that area its bogs down, let it kill the engine and pull out the spark plugs, they should be wet looking, youll confirm the extra fuel is leaking past the plugs and making for a over rich scenario. Its basicly like opening up the choke.
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So I want to hit the kill switch when it bogs ?? And then check. Cause it won't kill on it's own. He drove it last year like that and it would die or anything just wouldn't rev out all the way.
 
ya, if it wont kill it but bog it down just reach over and hit the kill switch and let it coast to stop, pull out the plugs and it should show it being very rich if its leaking past the plugs.


one other thing I remember on them phazers, check the fuel vent hose off the gastank, sometimes they like to get flat over time and it doesnt let adequate ventialtion to tank and then the f-pump cant move the fuel easily. really shows up when your on the mainjet, sometimes they will quit and then start back up, but be ok low speeds, but no flow for higher demand higher up in rpm.

check carb plugs first, yamanutz is right on the money on those!
 
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Ok I will go run it now. And see. We're is the fuel vent hose located on the gas tank (I know dumb question but just want to be sure). Also someone had told me about a fuel filter possibley. Is that under the seat ??
 
Ok. So I went out and to the phazer to wot. And of course it didn't do the bog at 4-5k. Well it had a little sputter around 4800. But kept reving. What rpm should this little guy run wide open. Also. Could this be that it will let it rev because there is no load on the track. I know I could get it to 6300-6500 but let off. Think I could get it to go to 7k. But with no load on it this little guy sounds like it's screaming and don't want to hurt it lol
 
youll need to ride it, not run it on a jackstand, the stock phazers run at 6800-7000rpm peak.
 
Ya that's what I thought. Hopefully can get it out and do a couple pulls on it this weekend. One other thing I noticed was there is a new belt on it but it sits down in the secondary 1/8-1/4 inch. Could the secondary spring be sacked and need to be replaced. This could be the cause of the slow climb from 6-7 grand correct. Or under load possibly y it won't rev all the way. I checked all springs end of year last year to make sure won't broke. But guess didn't think if it being sacked out. I have no clue how old it is.
 
Luke600r said:
Ya that's what I thought. Hopefully can get it out and do a couple pulls on it this weekend. One other thing I noticed was there is a new belt on it but it sits down in the secondary 1/8-1/4 inch. Could the secondary spring be sacked and need to be replaced. This could be the cause of the slow climb from 6-7 grand correct. Or under load possibly y it won't rev all the way. I checked all springs end of year last year to make sure won't broke. But guess didn't think if it being sacked out. I have no clue how old it is.
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no the belt sitting that far down means 2 things either you have to remove shims in the secondary or the belt is junk ( or good for a spare) on the ypz clutches it is hard to get then to sit even level with the top of the secondary also confirm for us this sled is bone stock right ....it has stock mains (143.8 pilots (95) and the reeds are stock and not junk boysens ? bad boysen reeds will also give you the top end rich symptom that you say you have ...that aside from the plugs in the carbs
 
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Is got a dg pipe on it (junk I know) but don't have a stock one. 145 mains. And stock piliots. That's what dg said to run. Yes it does have boysen reeds in it. They maybe have 50 miles on um. Belt is the same about 50miles on it. Last 2 rides if the year last year is when I noticed the rev problem. Could barley get 50-55 mph out of it. Doesn't bother my son as he is 12 and doesn't really ride it like he stold it but I knew it wasn't right. But also knew we weren't gonna get to ride it anymore last year so put it away and didn't worry about it. So got it out today of course trails not open yet but like I posted earlier. With no load in it. It seamed fine. Hopefully will get to test it in next couple days and see if it still won't rev. Or get any mph out if it
 
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