Re: help needed!
 

Airbox shouldn't make any difference to firing you could take it of totally and the bike would be fine until it snuffled up a leaf or some such!

Could be many things fuel injectors, faulty plugs, work top down to find the fault, don't dive straight in and start taking things apart, check the simple stuff first, I read that you checked the spark that doesn't mean they spark well right through the rev range, buy a new set try them, worst case you've got some spare!

Yes the gaps on the plugs can change, and it can cause a missfire.

Re: help needed!
 

I don't think there is but I will recheck it

Re: Carb cleaning help please.
 

Well, decided to take the carbs off and done it. A fair bit of fuel came out of them and i've got it in the clear container. Gues what whater mixed with fuel :(
Next step clean the carbs inside so where do i start...

Re: Carb cleaning help please.
 

The only thing that changed before it started missfiring was changing the battery.....what happened that you knew it was old? did it go bang and than flat? was it not cranking to start.

Re: Carb cleaning help please.
 

Biggest issue might be that the drain tube which runs from the tank filler recess down through the tank and out the rear has rusted through, it's not uncommon. This lets water directly into the tank from rain/washing.

It's been discussed before but I'm not sure if anyone has managed to successfully "sleeve" this tube, others will advise, or search.

Re: Carb cleaning help please.
 

As you've found water in the fuel usually gives this symptom of fine at tickover but doesn't like to rev. Reason being the idle jets are a bit above the mains so have better chance to be in clean fuel.

Take float bowls off, blow through any holes you can see with compressed air, that will do most of the gain for least complexity.

Just dropping the water out of them has a pretty good chance of curing it for now.

Well except it would be completely unrideable and run like a very lean bag of crap...

Re: Carb cleaning help please.
 

That drain hole is a right tw*t.

Zoran TIG brazes them back together which seems the best way. I also heard of someone using the head of a rivet to hold it.

Re: Carb cleaning help please.
 

I've managed to clean the carbs, not much of a dirt inside them but there was some. Also drained the tank and found some more water but not to much. After all that I'm happy to report that bike is happy again and revs like crazy. thanks for any advice thats been given