ok.. problem is...

between 0 and 4000 rpm the bike runs on 3 cylinders (or sounds/feels like it is at least)

between 4000 and 10000 rpm the bike runs on 4 cyl and is fine and has full power.

over 10000 rpm it drops back to 3cyl and behaves like it does under 4000 rpm..

i have replaced spark plugs, HT leads, and checked the wiring to the coils.

any ideas ?

reg/rec on its way out ? coils fscked ?

are you ceratin its running on 3 cylinders?does it do this when you rev the bike at standstill as well?

i dont thing its the reg rec as its part of the charging system and not the ignition system.it could be an issue with the coils or relative wiring but never rule out fue(carb)l related issues,especially if it happens everytime.



william

This might help you at least get rid of any electrical issues!

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 0324085098" onclick="window.open(this.href);return false;

i'll keep an eye on that thanks gavsta, been wishing i had the cash to just buy your bike in one piece since you listed it in the first place! i'll be watching your carbs too!

Hi all, quick update..

it was / is the coils.

i've borrowed some coils and leads off an RF900 that belongs to a friend and the bike runs sweeter than it has ever run before.

now i just need to buy some of my own, hehe

make it run on 4

if you want new coils look at dynajet site they do list coils of correct ohms etc i have a set on my 73a that were on my kwak 1000rx work just fine hope this helps :)