What am I missing? 93 Phazer help

snowman · Dec 11, 2008

I am really getting pissed at this old sled.
It doesnt want to run,I have replaced the cables completley took apart the carbs and cleaned everything in them.
I can get it started but it doesnt want to idle.
I have adjusted them per yamahas spec's choke and throttle play are within range.
once it does start it seems real boggy under throttle til about 4500 rpms (on the jack stand).
Lost for ideas. anyone have any thoughts besides throwing the pos in the garbage.
Or a decent sled mechanic that knows how to work on these antiques in the south puget sound area.
The sled is for my 8yr old daughter otherwise it would be a ball of fire right now.

Linc · Dec 11, 2008

When you cleaned the carbs, did you put the rubber plugs back in the right holes?

MARCUSO · Dec 11, 2008

Take some wd40 and spray it on the crank seal. If anything changes in idle, you might have a crank seal leak.
Those sleds have a diaphragm fuel pump I believe, and if there is a hole or a leak in on of the gaskets or layers, it might not be getting the fuel it need.

My et340 did this at one point, and the 480 had a lot of the same systems/

CreteRider · Dec 11, 2008

snowman · Dec 11, 2008

yep plugs are in the right spot. I will try the wd-40 trick.Thanks

mark · Dec 12, 2008

Things to check

1. A fouled plug
2. Throttle overide switch
3. Mouse nest in the muffler or some kind of restriction
4. Reed valves
5. Freeplay in oil pump cable, what kind of oil do you use? I've had problems with Phillips Injex mineral based oil.
6. Check compression, should be 85 or 120, can't remember for sure.
7. Take the head off and clean the carbon off, it makes big diiference in performance.

Bauer · Dec 12, 2008

Linc said:
When you cleaned the carbs, did you put the rubber plugs back in the right holes?

x2 My buddy accidentally did this.. One way to check is to take off the air box boots. If it runs better this may be the problem. Another thing you may check is the vent for the tank.

snowman · Dec 12, 2008

checked comp. 95 lbs first pull 120 on the 2nd. both cyl the same.
checked for leaks on the crank seal nothing.

i am lost !!!!

snowman · Dec 12, 2008

any one had any success changing the carbs to mikuni flat slides?
these butterfly carbs are crap?

Bauer · Dec 12, 2008

snowman said:
any one had any success changing the carbs to mikuni flat slides?
these butterfly carbs are crap?

No need. I have a 93 and never had 1 problem with it.. Serious about the rubber plugs in the carbs though.. You put them over the holes that you wouldn't think.. As said before my buddy did this and it would hardley move itself. Fiddled with carbs, left boots off for a test run, RAN SCARY good, said welp... we fixed it. Put the boots back on same bogging. Did that about 4 times before we figured out the wrong holes were plugged.

O ya and make sure your oil lines are hooked up while your in there..

MARCUSO · Dec 12, 2008

snowman said:
any one had any success changing the carbs to mikuni flat slides?
these butterfly carbs are crap?

I know this is pretty obvious, but I had a screw come loose on a butterfly carb, and it ran like crap.. it was for linking both carb butterflies, so only one opened..
YOu should also test your stator, it could be acting up.. so many things .

Linc · Dec 12, 2008

Have done a few flat slide or round slide carb conversions, they work awesome.

spudman720 · Dec 12, 2008

Check the pilot jet. Sounds like it could be plugged. Very small hole, doesnt take much to cause problems.

snowman · Dec 13, 2008

yep the plugs are in there correct as per manual, I pulled all the jets,needle valves,tubes you name it.cleaned them all
I was starting to think stator as well...how do you test it.
anybody have some flat slides they want to sell that will work?

MARCUSO · Dec 13, 2008

snowman said:
yep the plugs are in there correct as per manual, I pulled all the jets,needle valves,tubes you name it.cleaned them all
I was starting to think stator as well...how do you test it.
anybody have some flat slides they want to sell that will work?

I tested my outboard motor stator with a fluke meter with a loop. It showed the pulses per minute on each spark plug wire, and one wire was not showing as high RPM. I know there is a better way, but that is how I figured it out.

chadincolo · Dec 15, 2008

Another obvious question, how old is the gas? For some reason my son's phazer will not run worth a crud if the gas is over 4 months old...most sleds will run on older gas, but for some reason, his will not. Might sputter over, but won't run. Drain and replace, it will run fine. It's just sensitive I guess.

snowman · Dec 16, 2008

nope gas is new, I think I am going to trash the Butterfly carbs and try some TM flat slides on it as soon as I find some for it at least.

Looking for a pair of Mikuni TM 36-38 mm Flat slides carbs..

retiredpop · Dec 24, 2008

Bauer said:
No need. I have a 93 and never had 1 problem with it.. Serious about the rubber plugs in the carbs though.. You put them over the holes that you wouldn't think.. As said before my buddy did this and it would hardley move itself. Fiddled with carbs, left boots off for a test run, RAN SCARY good, said welp... we fixed it. Put the boots back on same bogging. Did that about 4 times before we figured out the wrong holes were plugged.

O ya and make sure your oil lines are hooked up while your in there..

So which ones do you plug? Service manual shows the pilot jet open and the other 2 plugged but is it right?

Bauer · Dec 24, 2008

retiredpop said:
So which ones do you plug? Service manual shows the pilot jet open and the other 2 plugged but is it right?

Pretty sure it's the other way around. Pilot should be capped.. Let me go double check the Clymer manual..

BRB...

Yup pilot capped. I think thats what throws people off. You would think the opposite.

Heres the breakdown Part #15 is the pilot #27 is the cap. HTH

http://www.gvpowersports.com/fiche_...ry=Snowmobiles&make=Yamaha&year=1993&fveh=567

Well that didn't work... But just select carburator in the drop down box and it will give you the detail.

retiredpop · Dec 24, 2008

Thanks, it sure doesn't help when the Yamaha Service Manual is wrong.

What am I missing? 93 Phazer help

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