stoped then wont start

[Sparkie]

Hi
I have a yamaha blaster 2004. It started with first kick but had no power in any gear and it spitted. Then made a funny knocking noise and died. Wont start at all now. Changed air filter fuel filter plug and cleand carb. All is still stock parts. After it died it kicked harder.
Any help?

 

[speedyslyder]

? sounds like you need to take it apart and inspect it...there is many vids on youtube..if you need help,
a lot of people will post to you just give them time

 

[Sparkie]

maybe need to replace the piston?

 

[Larry's Shee]

Start by removing exhaust and take a look at piston/cyl. No matter what you find do a leakdown test before you tear it down any further. An air leak may have caused the problem. After test remove reeds and look through there for damage. If you don't find damage to piston, look at flywheel/stator. If all good, pull clutch cover.

Highly suggest getting a Clymers or find the download on here.

 

[jus_me]

Leak test and compression then report back..

 

[Sparkie]

What do I look for when looking at the piston/cylender

 

[Blaaster]

If the piston is damaged I can assure you that you will know as soon as you see it.

 

[speedyslyder]

if it did indeed make a funny noise and your assuming it came from engine? nobody is going to know unless you take it apart.Something broke...take exhaust off and look for damage metal shavings? look for metal shaving on carb boot side after taking carb,boot and reeds out....Maybe have someone look at it that has experience..

 

[Blaaster]

Leak test and compression then report back..

Just to reiterate before pulling anything apart, compression/leak test first to help see what caused it.

Your first port of call is to look before you leap into the engine.

 

[Larry's Shee]

You look for UGLY : http://lmgtfy.com/?q=Damaged+2+stroke+pistons+images

 

[tfaith08]

Like Larry's Shee"s post implied, the problem could very well exist outside of the crankcase and cylinder.

When you say harder to kick, is it only harder when you're fighting compression or is it the entire way through?

EDIT: Like Larry's Shee's FIRST post

 

[Sparkie]

Okey so I removed the motor and the piston, and sleeve is damaged. Can I take it to an engineering shop and let the machine it and put a 68mm piston in? And what other mods do I have to make if I want to do this?

 

[Blaaster]

It all depends how scored the bore is and if it will machine out.

 

[Sparkie]

the damage is very little can barely see it

 

[tfaith08]

A hone may work as long as it doesn't put you out of spec on clearance.