b40rt

Should be worth a read, very interesting. You also have to try longer swinging arms, shock angle, spring rate, damping characteristics ..........

Hamish, Martin M would be my first contact for this sort of info, he might have spare flywheels rather than chop up an original.

Chamfer the leading edges, should reduce the on/off.

You couldn't ride a twin shock, you mean ?

Get a twin shock, you know you want one. (Biffyt is on the buckie again)

Formula Ford, Renault, XR2, Mini .........

Apico works well on every bike I have fitted them to.

http://www.thepoke.co.uk/2014/09/10/21-amazing-analogies-used-by-english-students/

Not so sure he could win SSDT first time.

Not SWM' s, early Italjets were similar to Bultaco.

" Race gas for high altitudes. " biilyT ​Don't know anything about this, however if you want any info on cheap brass jets let me know.

This leaves fuel. Fiddle with the air box = bullyt with his Wal-Mart battery drill trying to make his air box a collander.

Parameters - you can't change the elevation, temperature, humidity or wind. You can "fiddle" with the air box. So that leaves ..............

"My plug is whitish" = lean,the rest is just a bit patronising.

[quote name="billyt" post="374858" timestamp="1409585524" I need more air less fuel at the higher elevations, but how? Any suggestions? Your words. Obviously you checked the plug colour, it was black ?

Do you understand the difference between rich and weak ? Whether you use a jet or a laptop to achieveit, its the mixture that's important.

Because a larger main jet ritchens the mixture, your trying to weaken it. Delivery system might be different but principal is the same.Running weak also causes the overheating you describe.

Worth a try, also a new plug.

Have you tried petrol directly into the cylinder ?

Post removed, to many closed minds.

Think your analysing this toooo much. In my opinion the bars should be somewhere around vertical, trial and error to find your sweet spot.

Most modern shocks have the body at the top, worth checking.

Can those shocks be mounted either way up ?

Speak to inmotion bultaco.

Neil Dawson might be able to give you some info, think he has had his done. (His is a bit newer though)