Engine wont start (yes I've searched)

[Jeff T]

Thanks for those links, I've actually read through most of them prior to posting but I'm going to save them for any future problems i have. I'm almost positive that the problem is the magnet coil. I checked the resistance from black to blue and white to black and got no reading. Seems like the coil is shorted so im returning it for a new one. I'll let you know what happens once i get the new one installed.

Thanks for the help!

 

[Al.Fisherman]

Thanks for those links, I've actually read through most of them prior to posting but I'm going to save them for any future problems i have. I'm almost positive that the problem is the magnet coil. I checked the resistance from black to blue and white to black and got no reading. Seems like the coil is shorted so im returning it for a new one. I'll let you know what happens once i get the new one installed.

Thanks for the help!

http://www.motoredbikes.com/showthread.php?t=29813

 

[Jeff T]

I received the new coil a few weeks ago and just got a chance to install in a few days ago as i have been traveling. I am happy to say that it has fixed the "no spark" problem but the engine still will not start. I thought it may have been stale fuel so i drained out all the fuel in the tank. Then i took apart the carburetor to make sure there was no blockage or grime. Everything looked good, I emptied out the fuel that was left in the carb fuel bowl. I then replaced the carb, added a new fuel mix to the tank and tried again with no luck. Fuel is successfully getting from the tank into the carb because if i hold the prime button too long i can see fuel come out the air intake.

I live on a large hill so i have been riding it down the hill in order to attempt a start (can get up to 30mph), no luck however. I can hear the piston moving up and down and when i give it gas it just has a low bogging noise but no acceleration. Once i pull the clutch out the engine stops. I have looked inside the cylinder and not seen any flooding, nor do i believe it is the head gasket because there is good compression when i try to crank the motor by hand.

It seems that it might be a problem with the carb or an internal problem in the cylinder. Since im getting a spark and fuel in the carb its hard to say what is wrong.

Any ideas?

 

[Al.Fisherman]

I can't (63) but my son (34) can and I'm sure at 21 you can also. Have help, remove the air cleaner, spray a SMALL amount of starting fluid in the carburetor while holding up the rear wheel spinning it with the clutch engaged. My son starts our bikes quite often showing people how easy it is to start. Remember that starting fluid has no lubricant and will wash the cylinder clean. If it starts you have a carb problem, if not a electrical (also timing) or compression problem. You might want to remove the exhaust system eliminating any possibility that it's a factor. I have a problem pull starting a small 800w (2 cycle) generator at times (if it sits awhile). I drilled a very small hole, large enough that the tip extension (like a straw) of a starting fluid can can get into. The foam filter is installed, I give it a short shot and starts no more then 2 pulls. I also have my 5500W (4 cycle) 5th wheel electric start generator set up the same way in case the battery craps out, with the same results.

Also check or recheck the clutch to the fact that when released it is in full engagement.

 

[Jeff T]

So i tried the starting fluid but still no go. I removed the engine head to have a look around and everything looks good as far as compression goes, i can hear the air intake puffing out air as i turned the engine over so i know there is compression. There is fuel in the carb, but the weird thing is that when i spray starting fluid directly into the spark plug hole then try to start it I still get nothing. I first tried spraying it into the air intake as well but no luck there either.

It seems like the spark plug isnt firing once its under compression but its a brand new plug and the spark looks strong when outside the head. I also have another spark plug that I tested and the same thing happens. I went back through my wiring to make sure there were no areas that might short when the plug is under compression but everything looks good.

Do you think the timing could be causing the problem? It would seem like I would hear the engine start regardless of timing when i spray starter fluid into the cylinder.

 

[Jeff T]

Fixed!!!

Ok everyone I finally got the bike running a few days ago. Turned out that when i replaced the magneto coil (the initial problem) I installed it upside down. The white wire was on the top and the blue was on the bottom. This resulted in a miss timed spark, 180 degrees off. Once i flipped around the magneto it started up.

Just in case anyone else is having a similar problem make sure to check that the magneto is installed correctly, blue wire on top and white on bottom.

 

[HeadSmess]

ya goose

good you admitted it so as to help anyone else out though