yamaha blaster motor problems

[littlekeb]

i traded my bike for this because it was to small and it ran good for about the first 4 days but used 7 or 8 spark plugs. then yesterday it started to run worst and today it wont run at all. it is getting to much oil for somewhere. i have to premix my gas and it is mixed to about 35:1 to 40:1 with belray mc-1. i have only one plug that will make it run for a couple of seconds and that is a champion.
thanks
joel

[derek01raptor]

Hi Joel
Firstly, you should get 12 months out of Spark Plug before changing them as part of a maintenance thing.

My first thought was Rings/Bore. If you have excessive wear here you will heavily oil your plugs. You may need (or someone with a few tools) to pop the hood and take a look in the bore of your new purchase.
Second thought was to check your intake end. You may have a blocked air filter or dirty jets giving you a rich mixture?
Can you go back to the dealer/person you bought the bike off? You may have been shafted mate...
Maybe you could give us an idea of the year etc?

The champion plug may be a "hotter" plug giving you false results. - Using the incorrect plug will eventually cause damage to your engine.
Let us know a bit more?

[littlekeb]

i was going to go ahead and take the head off and see what everything looks like but i really didnt feel like it but i guess now i will.
i just cleaned the carb and took the airfilter off and it didnt help any. the only jet with numbers on it i found said 32.5 is that stock or not. the hole in it is really big compared to what i have messed with. old vw's mainly. i dont know what all has been put on it. it has boysen stickers on it but i dont know if it has them in it and it gots good comp. i dont know the number but i will try soon to check it.
i might be able to trade back but i really dont want to. the begining of spring i was planning on rebuilding it and make it read for race. so i might just have to do it sooner. i really dont think that i got shafted but i could be wrong. the one thing i am wondering if it might be the gasket to block off the trans from the crank case or something like that and it is letting oil seap in and burn it up.
i dont know the year but have the serial number off of the frame if anyone knows a place to get the year.
i put a new plug in it and it ran like a dream again but when i tryed to run it the next morning i got about 30 feet after warming up and it spudered and died. if you clean the plug it will run for like 20 sec and then die again. i think it is only putting out like 100 or 1000 volts. i dont have a book on it and i was trying to find out what wires where what so i could hook a light up to it and i found the kill wire from the motor and it read one of those. i think it was 1000. also it isnt putting out much juice for the light i was only getting like .5 volts.
also before this started to happen it would sometime would let something loose like blowing out a junk of carbon and there would be alot of smoke but then it would stop. the stock silence was taken apart and there is no baffle and the pipe is a aftermarket with no name. it is steel color.
thanks
joel

[dirtdemon4life]

Sounds like a simple fix.

Jetting.

[SirFallsALot243]

My thoughts exactly max. Blaster needs to be jetted, in a big way. Id check that long before ripping apart the motor.

[littlekeb]

well before i got it the guy i dont think had a problem with it but when i got it the spark plug was loose. so what should i do get a small jet and is the one i got aftermarket/larger or what. also i get really good fuel milage compared to my old bike ad it was a cr60r.
thanks
joel

[hardlydangerous]

What size main jet is in the carb?

Sounds to me like you have a bad crank seal or case leak and it's sucking in transmission oil.
Does it smoke a lot or does the smoke stink?

[littlekeb]

i only found one jet in it that had numbers on it and i cant remember where it was but it had 32.5 stamped in it. and it does smoke a whole lot and it really doesnt smell. i was thinking the same thing because sometimes it does smoke alot like it is spiting out some trash and burning it and other times it doesnt smoke as much. also how do i check the transmision oil in it. i was told there is a sight gauge somewhere on it but i cant find it anywhere.
thanks
joel
ps the main bearings on the crank are going out. they are making lots of noise.

[hardlydangerous]

Well then that's half of your problem.
check the bearing by removing the stator cover, then grab onto the flywheel and lift it up and down. if you can feel ANY up and down movment or hear any up and down movement the bearings are shot and the crank needs to be rebuilt.

The 32.5 is the tiny little pilot jet
The main jet is the big one in the middle of the carb (hex shaped). It screws into the long brass tube (needle jet)
if it's missing that is the 2nd half of you problem

[littlekeb]

the brass hex thing is there but i dont hting there is anyhting else. the crank does need to be rebuilt and new bearings. it moves alot. today it is doing something dif. it has either no throttle to half throttle then full and it will only run at half choke. no low end power.
thanks
joel

[twoofeach]

That Blaster is evolving. Pack your bags, we're going for a long ride here. Before you start throwing money at that thing, you need to find out exactly what is wrong with it. You might as well take off the head and check the cylinder, rings, etc...

[littlekeb]

well either way i am waiting until the start of spring to do anyhting major with it for money reasons. but when i do get into it i am going to get a weisco crank, big bore kit, fmf exhaust, and some type of upgrade for the carb. hopfully a 34mm one. so when i do all this i will not have to worry about the stock head clynder and crank.
joel

[littlekeb]

right now i am just trying to get it working good enough to go play around on.
joel

[littlekeb]

i was thinking that the problem might have something to deal with the cdi unit or the strator. it is only putting out like .1 volts for the lights. could this have anyhting to deal with it. i just checked my old spark plugs and there is like 0.5 ohms from the top of the plug to the electrod and from the top of the plug to the ground it has like 1,000,000. also just remebering if i take an old sparkplug and put it to the side of the cylinder it still sparks with a blue spark but will not run more than 30 sec. on it and put a new plug in it and it will run just fine.
thanks
joel

[TRXman86]

hummm? you may want to just take it to a shop and let them do a troubleshoot. sounds weird. but of course if the crank is loose, that is a major problem and you should NOT even try to run it. unless you want to buy a new case for it. as far as a carb, they are 26mm stock, i would go with a 30 or a 32 if possibly. 34 may be a little big, but maybe not if you put in a 240 kit. thats a big upgrade. hope ya figure it all out

[littlekeb]

yeah i figured it out. since the guy before me didnt jump it much the crank being loose wasnt much of a problem but since i jumped it alot i think the flywheel was coming in contact with the stator and cause lots of problems.
joel

[hardlydangerous]

If there is any play in the crank stop running it or it will cost you a heck of a lot more when you destroy the crank and cases. fix it before it breaks down