Blaster wont start

Nickmazz

New Member
Nov 12, 2012
84
0
0
Ok So i just rebuilt top end. On my 2005 yamaha blaster with a pro circuit pipe and oil block off kit. I run 32:1. When i kick it really hard it pops but dont run. I have a 360 main jet in which i think is to big. I want to know what size main jet i should use . Why it wont run. and why do i keep fouling plugs.e
 
My cuz who is a mechanic didnt do one. It ran great till i let it sit overnight then i started drove down the driveway stalled out and i couldnt get it started
 
Sheared flywheel key!! 'Bout willing to bet money on it. Pull the cover and flywheel and take a look at it. The engine is probably popping because the ignition timing has been thrown off too far for it to start.

Once you figure out the no-start problem, it would be smart on your part to follow blaaster's advice and perform a leakdown test. They are easy to do and can save your engine's life.

Oh, and you'll be in the 290-300 main jet range with your mods and no airbox lid installed.
 
How do you fix a sheared key. I dont think its that cause it ran good then just bogged down. and stalled.
 
You'll need a flywheel puller to get the flywheel off. Other than that, it is a simple job. Do you have a service manual for your Blaster? If not, there is a FREE downloadable one stickied here you can use. It goes into detail about disassembling the engine.

If a flywheel key shears, you usually get little to no warning. The engine often just bogs out and dies and won't re-start. Sometimes, it will pop or backfire, but it won't fire back up.

The only other real problem you could be having (if the key is OK), is a broken reed petal. Worth checking, too.
 
How do you fix a sheared key. I dont think its that cause it ran good then just bogged down. and stalled.

I would lay my money on no leak test, no heat cycles.

Piston siezed in cylinder, maybe then sheared off the woodruff key in the flywheel.
 
Nope it is not siezed. I took carb off and kicked it over it ran for like 10 seconds and died.A wierd jet came out of the float bowl. Very small the flat head engraving were the screw driver goes is cracked so i cant put it back in nor can i find a replacement. Starting to give up on this thing. Takin it to a mechanic soon