1986 yamaha phazer. fuel issue - Snowmobile Forum: Your #1 Snowmobile Forum
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Old 02-11-2010, 04:51 PM   #1 (permalink)
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Unhappy 1986 yamaha phazer. fuel issue

So I brought my phazer home from my girlfriends house a couple towns over and let me tell you the thing ran mint over there. No issues at all.

I get it home and the thing bogs and cant even make it up the hill. so im like. carbs. cleaned them. again, and again, and again. about 5 times. the fuel pump was cleaned. The fuel lines were replaced. pulse line replaced. i see some air in the carb lines. I did an engine swap, same issue. Tried a diff wiring harness, it seemed to fix the issue, but now it was a different kind of bog, it was a starving for fuel bog. Like at random it cuts out. before it just had no power and the engine lugged every time you hit the throttle then it got some power and went. what happens now is ill park the thing and it will take off just fine because i think fuel is loading up in the engine, but when im riding casually and I give it some throttle the thing bogs and loses power occasionally. does anyone get my point?

So i know that at times the engine is starving for fuel. but at the same time i richened the needles out 4 turns to get the thing to richen up enough for ok riding.

and it uses like a tank of gas in 2 hours now. whereas at my girls house it would last for like a whole day of riding on one tank with the needles at 1.5 turns.


Im really feeling like this might be a jetting thing, but even if i changed the jets the thing would still go through gas just as fast right? so it cant be that right? cause that much gas isnt normal.

ill try to find out the altitude for y'all. please help me out on this.
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Old 02-11-2010, 05:15 PM   #2 (permalink)
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I checked the altitudes on google earth and they're pretty much the same only 100 feet higher where i live. what the heck!? i dont think its a motor problem cause two motors acting the same way i think not.
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Old 02-11-2010, 06:15 PM   #3 (permalink)
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did you try rebuilding your pump? maybe it isn't giving enough pressure to the carbs so it isn't atomizing right, which would make it need more fuel to run right.
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Old 02-11-2010, 06:19 PM   #4 (permalink)
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clogged/kinked tank vent line? fuel filter?
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Old 02-11-2010, 06:38 PM   #5 (permalink)
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To the fuel pump post: I did rebuild it but the thing is is that I've never ever had problems with them. everythign looks ok inside. I didn't use a rebuild kit just cleaned it. Did i sandwich the gaskets right? I did them like this.

top/papery gasket/plastic circle/rubber gasket/center/rubber gasket/plastic circle/papery gasket/bottom.

checked plugs, they look almost dry. healthy, but i have a feeling theyre getting too lean.

Fuel filter guy: I am not even running a vent line, just the fitting is exposed, it's always ran mint like that.

the fuel filter is original i think. i DID carb cleaner blast it, maybe i freed up a whole lotta dirt in it, but i really really doubt it. Maybe the line going from the fuel filter to the top of the tank has a pinhole causing an air leak?

I totally turned down my chokes so there cant be any rich issue there.


but it uses alot of gas cause i have to run it at 4 turns out on the screws.
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Old 02-11-2010, 06:42 PM   #6 (permalink)
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It also sounds like a stupid 4 stroke quad when it is idling sometimes. like only when i run it lean and it idles. it doesnt have that 2 stroke crack to the sound. maybe it is running on one cyl. at times. if that helps or not?
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Old 02-11-2010, 06:45 PM   #7 (permalink)
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i was just thinking, if a small piece of sand or something put a pinhole in the diaphragm of the pump it would cause it to not function properly... I would spend the $20 and put a rebuild kit in it, it can't possibly hurt anything
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Old 02-11-2010, 06:53 PM   #8 (permalink)
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If i put my mouth on the fitting that the pulse line goes to on the fuel pump and i blow and suck i should feel it retracting and coming back forward right?


^^^^^^^^^^
HAHAHAHAHAHAHA
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Old 02-11-2010, 06:56 PM   #9 (permalink)
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because if it was bad it wouldnt do that I don't think? do you follow me or no?
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Old 02-11-2010, 06:58 PM   #10 (permalink)
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maybe... idk that was just my thoughts.
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Old 02-11-2010, 06:59 PM   #11 (permalink)
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Yeah, I feel you man.


and i was laughing of the very unintended sexual implication of my post
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Old 02-11-2010, 07:08 PM   #12 (permalink)
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could there be water in my gas? would water cause it to lean out? and how do you dump old gas. i think its illegal and my dad complains constantly i dont want to listen to him. im running out of ideas...
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Old 02-11-2010, 07:09 PM   #13 (permalink)
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I know you have those crazy Mikuni butterfly carbs (cause I have same in my Phazer), maybe they are out of sync? I know the repair manual says not to seperate the two carbs because of difficult syncing...that or sounds like the fuel pump to me. I recently replaced the Mikuni fuel pump in my Phazer, $35 shipped to me
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Old 02-11-2010, 07:15 PM   #14 (permalink)
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No the butterfly things are synced. kinked pulse line from the crank? idk though i ran that pulse line all winter so far no problems
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Old 02-11-2010, 07:17 PM   #15 (permalink)
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More I think about it...if I were you I would buy a new fuel pump, 86 Phazer uses a Mikuni df52-21-d, I think it may have been replaced by new #, but google it. If you are going to be riding on trails it just makes sense to replace a 24 year old pump and at $35 it is a very cheap investment and with luck may cure your problem
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Old 02-11-2010, 07:20 PM   #16 (permalink)
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yeah youre right. The dealer would probably sell that too.. ill look around and let you all know if i come across anything. thanks guys. if you have any more suggestions let me know.
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Old 02-11-2010, 07:24 PM   #17 (permalink)
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Hey Tyler, the dealer is going to nail you hard on the price of a pump (probably sell it to you as a Yamaha part, $175 I think). Google the Mikuni number (with or without the d at the end of number) and you will find alot of places to buy them at for well under $50
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Old 02-12-2010, 07:11 AM   #18 (permalink)
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Just get the rebuild kit for the pump, much cheaper (about $15).
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Old 02-13-2010, 05:47 PM   #19 (permalink)
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maybe im way off on this but ill give it a shot. sounds like what my 89 was just doing. those 2 rubber plugs in the carbs where in the wrong spot. check out this link hope it will help you.(link thanks to snow pro..)


bhttp://www.snowmobileforum.com/attachments/yamaha-snowmobiles/12024d1265506945-need-help-89-phazer-picture-001.jpgrace t
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