Suzuki 2 Strokes

UPDATE:

New curve:
1000 - 3000rpm: 12°
3000 - 9000: 22 °

Bike runs good but loses power @ 6000rpm: probably fuel/air regulation

Hi guys,

I bought a suzuki t500 from 1974 last year. I rebuilt it and he is almost finished.
I programmed the ignition myself and the bike shifts good and drives very well till 5000 rpm, then he loses power.
He doesn't fall out and he has this in every gear.
The color of the spark plug is nice coffe brown..

My Ignition advance curve
1000 - 2500 rpm: 10°
3000 rpm: 14°
3500 rpm: 20°
4000 rpm: 24°
5000 rpm: 28°
6000 rpm: 33°
7000-9000: 35°

Specs:
Mikuni vm34 carburator with main jet 290
Overhauled engine
Ignitech tcip88 ignition
Stainless steel exchaust systeem


Is there anyone who knows what i can try to get the problem solved?

Thx in advance!

Hi John,

The first thing I notice is your ign, curve is too far advanced, 35 degrees BTDC is 7mm BTDC. On my race engines I don't go over 2.9mm BTDC ( 22 degrees BTDC) up to 3k rpm and then it retards from there onwards (HPI Ignition). Try a straight ign. curve of 21 degrees BTDC and see how it goes.

Cheers Geoff