- Joined
- Jan 3, 2008
- Messages
- 329
I've got (amongst others) a 750 Commando which was running very hot, appeared to have got to the bottom of that by setting the timing properly with a degree wheel. Now it won't run worth a damn, it runs like the choke is on all the time and smokes like a 2 stroke! I'm about to lift the head (tomorrow) but before I do I'll run the things I've done to cure this past you clever people and see if I'm missing anything!
Changed the carb (single Mikuni) with another Commando I have
Changed the complete ignition system including coils
Wired the ignition direct to the battery in case I was getting a voltage drop
Checked valve lift & Clearance (My Interstate has just run a bloody cam so I know what it looks like)
Compression reads over 150 PSI on each side and leakdown shows it still holding 110 PSI after 5 Minutes
Checked engine breather isn't blocked
Changed plugs coils & leads
Checked valve timing & put in new valve chain & tensioner as the old one was worn.
All to no avail!
Problem I have is I don't mind lifting the head as its only an hours worth of work but what the hell could be causing this?
I've reason to believe this motor is very low mileage standard 750
Very confused of Perth :evil:
Changed the carb (single Mikuni) with another Commando I have
Changed the complete ignition system including coils
Wired the ignition direct to the battery in case I was getting a voltage drop
Checked valve lift & Clearance (My Interstate has just run a bloody cam so I know what it looks like)
Compression reads over 150 PSI on each side and leakdown shows it still holding 110 PSI after 5 Minutes
Checked engine breather isn't blocked
Changed plugs coils & leads
Checked valve timing & put in new valve chain & tensioner as the old one was worn.
All to no avail!
Problem I have is I don't mind lifting the head as its only an hours worth of work but what the hell could be causing this?
I've reason to believe this motor is very low mileage standard 750
Very confused of Perth :evil: