The mighty backfiring saga (Well hopefully not a saga!)

[Ivan]

Nah, Ivan one is lighting and the other is the ignition stator.

Yip a lighting coil and a stator coil.

Lighting is not needed and is putting extra drag and weight on bike you dont need.

I know you know this SKunk its for any one else who is confused as to why you would bother.

[koba]

They are both stator coils, one for lighting and battery and one for coil.
Doesn't really matter anyway, aslong as u get it sussed!

[koba]

Updated ===

Things found what i should of looked for before the weekend anyway (rushed)
-Spark Plug Cap, had electrical tape around it because half of one of the sides was missing. Result - Replaced with a NGK spark plug cap what looks good

-Took the plug out.
The plug looks very very gray! and is slightly wetish for a couple of threads.
looking at this http://www.skunkworks.net.nz/Spark_p...ding/index.php (thanks skunk)
it appears to look like number 27 Woo! - Too hot or lean / pre ignition range.
also the plug was a B9ES (the colder type)

Going to whip the flywheel cover off and check the timing out now.

Another important point!

The plug will look "lean" as you put it because it is running HOT!
Plug colour isn't just an indicator of mixture strength; it is basically a measure of HEAT, excess heat can be caused by lean mixture AND/OR incorrect timing.

Therefore you are correct and prudent to be checking both aswell as other things that could make it run hot such as air leaks after the carb or whatever.

[quallman1234]

Now where would i get different size jets from? Preferable in stock? Im going to start by riching it up by 2 - 3 jets. Also is there a way i can measure what jet is currently in there or do i need a special tool?

Thanks for ya help
Cheers
Kyle

[Ivan]

Now where would i get different size jets from? Preferable in stock? Im going to start by riching it up by 2 - 3 jets. Also is there a way i can measure what jet is currently in there or do i need a special tool?

Thanks for ya help
Cheers
Kyle

Yeah man.
They numbered and youl soon tell thebigger the number the bigger the hole in it but sometimes it can be theother way round take it out either 6mm or8mm will do the trick go to TSS or what not and say can I get a jet richer than this grab a few while your there they only like 50 cents or something they aint much then youve got more to muck around with it

[koba]

$11.50 from TSS (as new parts) a couple of weeks ago.

I think motomart have a decent selection in stock because they do dyno tuning and the like but I think if you go to the parts counter and ask for them they will order them in as new parts and thats why they cost alot. not sure on that.
I think there is someone selling them on atrdme for $5 each or so.

Your carb will probably be a mikuni (but may not be) but there are a few different types of those with different jets.
Remember there is more to it than just main jets aswell, they are only for full throttle operation.

Also remember they may be numbered as "130" but actually be drilled out to more like 150 or somthing.

Drilling is somthing that you can do to try it cheaper BUT ,in short, it ain't as good or accurate.

Pull the carb apart and see what the jets are like and write down all the numbers on them. I may have a few you can try to start with to get an idea where the jetting is at.

Remember if you are running premix on a bike intended for injection (yep!) the jetsize must go up aswell.

The jets will probably be causing it to run lean but still check the timing first and make sure that is all set to original spec so you are only dealing with one thing at a time.

Start reading...

[quallman1234]

$11.50 from TSS (as new parts) a couple of weeks ago.

I think motomart have a decent selection in stock because they do dyno tuning and the like but I think if you go to the parts counter and ask for them they will order them in as new parts and thats why they cost alot. not sure on that.
I think there is someone selling them on atrdme for $5 each or so.

Your carb will probably be a mikuni (but may not be) but there are a few different types of those with different jets.
Remember there is more to it than just main jets aswell, they are only for full throttle operation.

Also remember they may be numbered as "130" but actually be drilled out to more like 150 or somthing.

Drilling is somthing that you can do to try it cheaper BUT ,in short, it ain't as good or accurate.

Pull the carb apart and see what the jets are like and write down all the numbers on them. I may have a few you can try to start with to get an idea where the jetting is at.

Remember if you are running premix on a bike intended for injection (yep!) the jetsize must go up aswell.

The jets will probably be causing it to run lean but still check the timing first and make sure that is all set to original spec so you are only dealing with one thing at a time.

Start reading...

Cheers man. Im going to the take the carb down to motomart now. See what they can do for me. It only occurs at full throttle btw. Im just going to go wild and see if a couple jets higher will do the job. Problem a dump idea but they are cheap as.

[quallman1234]

Ok ive gone up 3 jets richer. That should be a good place to start from.

[koba]

Ok ive gone up 3 jets richer. That should be a good place to start from.

Awesome.

[quallman1234]

update, When skunk stole my stator we noticed that the clipy thingy slidy thing what u line up shit with (Forgot the name completely out of my head!) what keeps the fly wheel on straight and lined up, was just a piece of metal, will have to try find one.

[k14]

Woodruff key??

[koba]

That could lead to the timing being out....

[Skunk]

It had a thin piece of steel metal that wasn't big enough in it. WTF!? The timing was either out or moving all over the place I reckon because the flywheel wasn't tight either.

[koba]

It had a thin piece of steel metal that wasn't big enough in it. WTF!? The timing was either out or moving all over the place I reckon because the flywheel wasn't tight either.

Damn! That is crazy shit!
I have a vivid imprint in my brain of a big backfire out of the carb, a shitty sheetmetal key would do that!
It does sound like the mainjet was woefully inadequate ASWELL as the timing being shockingly shit.


Should be a decent bike when it is sorted right.

[quallman1234]

My memory is back.

Wood Ruff key.