Any motorcycle mechanics on here
 

As above any one on here a bike tech

Whats the prob then matey???

I just bought a 2000 yz80 just had a engine build but can't get it to start so looking for the timing marks

You need to find top dead center (T.D.C) To do this you need to have the spark plug out and put a screwdriver throw the plug hole.
Remouve the flywheel cover, and spin flywheel till the piston comes up to the top, and rock the flywheel to make sure the piston is at the top, if there is no marks on the flywheel that you can see then spin the flywheel intill the piston comes back up to the top, you shoud have marks on the 1st go or 2end go. you shoud have an arrow pointine to a mark on the crankcase

I hop this might help.

Is the plug getting wet and is it sparking and also make sure its got the right grade plug this is important and don't use a iridium plug just a normal NGK will do the job
...

Then as SRIDGETT said you need to find TDC then check out the timing points on the stator bracket .... pics would be good when u have found TDC

Hi guys I can't find any timing marks on it just need a pic to check with what I got yes it sparks and the plug is wet it's had also got the correct plug in it

Will check what sridgett has posted in the morning

have you tried fitting a new spark plug 2 strokes can eat plugs

If its a single cylinder 2 stoke you don't need any timing marks, make sure its sparking and that the magneto is working too

It's a brand new plug the engine has just been rebuilt at a motorcross shop but they can't look at it now for a few weeks

If its just bin rebuilt, wipp out the plug and listen as you turn it over if you hear that its got compression, also make sure the earths are touching clean metal

I'd still try another new plug

Yep I agree also heat the plug up before you fit it

It's got good compression and sparks it defo has timing marks somewhere but I can't find it as if the stator plate is in the wrong place it will spark when it ain't meant to

I did heat the plug as well it back fires every now and then

I also have tried another plug with no joy

was it a new plug

No a used plug

I will go get another new one 2moro

Post a photo of the stator plate.

What's been done to the Carb, has it been cleaned?
How old is the fuel?

I was just in the same situation with a husky 610 left kick I even sent the hole ignition system off from the generator to the plug to be bolted on to a test bike!
Problem with mine turned out to be the carb and after re building it with new O rings and seals and getting the idle / mixture right. It now starts spot on

Cheack the reads mate common on two storks they break up and it will never start.

Cleaned the carb out it has fresh fuel the reeds are sweet I just had a cough been on it all morning will get pics now

http://i725.photobucket.com/albums/w...B1130A4FA2.jpg
http://i725.photobucket.com/albums/w...E5357E46DB.jpg
http://i725.photobucket.com/albums/w...03AF12E2DA.jpg

These are the marks I can find but don't know what is what

did the engine builder only have a chisel and a lump hammer in his tool collection

Know the builder built the top end and bottom end the guy I bought the bike from fitted the flywheel and stator plate but stripped the threads on the fly wheel so can't get it off

Should the line on the flywheel line up with the stator plate

All sorted now so many little things I had to do but it now runs just need to set the idle and mixture will get someone that knows what they are doing to sort it

Guys just one more problem it's running back wards I do to know where the timing marks are meant to be but I do know that moving the stator platrand starting it again is not solving it

What you mean the bike drives back???

Yes mate it's running backwards as in if I put it in gear it will reverse lol

I have retarded the ign as far as it will go as well just found out it has a longer piston as it was bored to 100cc it has 3 base gaskets on it if I take them off and go with one the piston will hit the head

LOL 6 speed's in reverse. That's funny you said that mate as i was at a mates house chating about bikes and he had a mate who had the same prob. what you got to do is rotate the timing 180 degrees.

It defo was a surprise. I can't move the timing on it mate

y not mate???

Because the way the loom is mate it won't rotate 180

AAh can you not move the loom and then rotate?

No mate what if I took the windings of the stator plate and switched them around would that work

Not sure mate try it and see if not what you need to do then mate is take the timing system off and rotate the engine 180

Before you do anything I won't to see a vid of you flat out backwards in top gear lol