[PeterS]

Do you have any idea of the hp output is at around 5000 rpm Pete? That 45 mph is on you current bike as set up ?

Is there room for a larger than 14 tooth sprocket on the front ( an hour on the lathe would see the centre bored out of a larger one ready to weld on .... I know you've thought of that) but is there room?

Originally Posted by Ironside

renault-megane-dci wrote:-


Have you been looking over my shoulder ?, spookily accurate. I'm not sure what you mean by 'waste mode'.



I'm currently using the highest gearing I can find off the shelf, 14 x 36. I can't go smaller on the rear sprocket without going larger on the front because the chain has no clearance over the swing arm. The gearbox sprocket has un unusual design and without cutting and welding, is only available in 14t from the USA at $40 + shipping + import duty +VAT (ask me how I know). So I'm kinda stuck with it for the moment.

Peak tourqe for an unmodified engine is 5,500 rpm. which equates to 45 mph. and a quarter throttle. I should try a run at this speed to see what happens.

Although the fuel economy is important, the bike has to remain useable, having only 4 gears means that I dont have a spare gear to use as overdrive.
I've read somewhere that there is a vehicle called the TRX 125, which shares a similar motor but has 5 gears, if I could get one of those engines things might be different. Unfortunately it was never imported into the UK.



Thanks sendler, I don't think I'll bother with that then, time and money would be better spent on an AFR meter to set up the carb properly. Even at today's fuel prices, the payback time won't be too long.

Thanks for the feedback
Ironside.