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need mechanical information on yamaha raptor

tyandzoe

By tyandzoe
in Yamaha ATV Forum

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tyandzoe Newbie

tyandzoe

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My son has a yamaha raptor yfm50rt. It is idling fine, but when I put it in gear and give it gas it seems to loose power and die. I changed the oil, new spark plug and took off something to do with the fuel before it goes to the motor. i cleanded the air filter and thought about the carbuator but wasnt for sure I have the manual and read it,, but it says it may be a clogged fuel cog...but it doesnt say where that is. And I was putting grease in the fittings where the front pivots and the fitting fell off. Does anyone have a good idea on how to put that back on. I have a little common sense about motors but limited...pretty good for the mom... thanks for any help..

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Raptor8 Proficient

Raptor8

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usually when they cough and die under load it indicates a lean condition, like a vacuum leak between the carb and the engine. perhaps a little vacuum nipple missing? On those little buggers there is also a restrictor in ther intake [sounds like you found it] and not sure, but many had a restrictor in the exhaust as well, but these should not keep it from running... hmmm. Look at the 'safety swith' on the back of the bike where the lanyard is supposed to be. If there isn't a key in the switch it won't run over idle. I'll bet that is it. The switch has to be plugged into the harness and there must be a key in the switch [the key with the lanyard on it].

Sounds like you are very thorough, let me know what happens OK? happy to help.:cute:

What color was the working end of the sparkplug you removed? hopefully brown or tan.

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Raptorman224 Explorer

Raptorman224

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Well I'm not sure about how to put the fitting back on, but earlier today i was having the same problem on my Suzuki 80 (Dirtbike). What i did was clean the carb and cleared out some sediment build up and i blew air into the little pipes sticking out of the carb that. (they should be connected to clear tubes) to clear some debris out of that. It seemed to work for me but i'm not sure. Your jetting might be off or might be blocked with debris which would change your fuel/air mixture which might be causing that problem. "If there is blue smoke coming out the muffler, then either the rings are stuck in the piston or there is wear on the valve stems/seals or the piston/rings." Hope this helps, keep us posted : )

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Raptor8 Proficient

Raptor8

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as for the fitting, hopefully it is just a screw in zerk, put it could be a push-in as well, does it have threads or barbs on it? you might put a piece of tape over the hole until it gets reinstalled just to keep the dust out...

Raptorman224, do you have any other ideas? I'm quite sure it's just a zerk, but don't rem if it is screw-in or push-in. Thanks for the help 224!

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tyandzoe Newbie

tyandzoe

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thanks guys for all your help. I looked at the fitting and it doesnt have any thread on it so maybe it just broke off in there. I guess I could try to get another one and push in...I did notice today that the plastic thing that conects the lanyard is broken and hanging down... I am going to try to mess with that in a while...great advice...:biggrin:

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Raptor8 Proficient

Raptor8

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well that is certainly good news! I don't know about that fitting problem, I thot all those front ends were sealed. Perhaps a picture from a parts catalog? that would help greatly.

Most larger dealerships have catalog access, like chaparral, pro-caliber, etc. I use pro-caliber since I used to work there [before it was pro-caliber.]

:cute:

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