mr benn

kinked or trapped vacuum or fuel hose?

Yam dealers in the UK buy their parts wherever they like. Why would the US be different?

plug, cap or coil breaking down when it's hot?

what seems to be the problem?

Waterstone Brighton '64

you want an Akrapovic on that. had one on mine. sounded lurvely.

what's leaking from it? are you going to attempt this yourself?

you junked the oe airbox and fitted individual pod filters? one size up on the mains is nowhere near enough. you will need to go up maybe something like an increment of 20 - you've made a huge change to the airflow. if you continue to run it without rejetting you will melt valves and possibly pistons.

that 7k thing is likely to be the code for the exup not working right. it's probably siezed.

forks go through yokes on all bikes don't they? USD forks have huge fat outers that won't fit into the RWU fork yokes on the earlier bike - so no.

Take it back!

It's not Yamaha policy in the UK............dealers over here are quite happy to take your money!

Is the head not bolted through the cylinder block into the lower crankcase?

Have a job - ThunderCat has no exup valve. 8000 is often used to indicate a TPS fault.

Good choice. You really should go here: http://trx850.motomaniac.net/forum/index.php and register. Loads of TRX info, people and stuff!