as said above, could be anything.....another option is a clogged air filter, causing it to flood. clean the filter or leave it off (temporary) and see how it goes.

Not got a garage, so a bit restrictive at the moment

I've had my Avanti barrel re-sleeved with iron. I think Ron Moss will sell an un-plated barrel for less than the plated.....another option ?

If heat is a major consideration, have you considered the Avanti 225 ? Plug and play with enlarged barrel and head fins. Runs a lot cooler than standard.

I'm sure you can fill a V5 application form in without the reg' number.

If it's been registered in the UK before you should then get the V5 back with the reg' .

.........................or you may not !!

Looks like the LCGB are kicking ass !

https://www.gov.uk/government/publicati ... ion-o37319

A lot of "performance" engines run at 17/16 static so if you aimed for that at 6000 revs it should be ok.

Could be timing. At 21* you may be retarding under 10*......maybe worth a strobe to check your timing at 6000 revs. Copied from CamLam: Timing when the stator is positioned fully advanced will give you around 21 to 22 degrees when the engine is not running (you cannot check this). When you scooter i...

Standard Avanti 225 with Franspeed Race and TMX35, fully loaded: GPS 84mph .......only done it once but hit the 80mph on more than one occasion.

What does "courius" mean