6 replies to this topic

[Ol timer]

just gave the mini a bit of a service and noticed plugs in 1 and 2 are a bit sooty. 3 and 4 look fine.
Any ideas where to start ?

[timmy850]

Check the plug gaps

Check the resistance of the leads

Check the rotor and cap contacts are clean

Check there's no air leaks on the carb/manifold gaskets

Check there's no leaks on manifold plugs

[Ol timer]

cheers timmy. Will start on it tomorrow

[Ol timer]

Check the plug gaps
Check the resistance of the leads
Check the rotor and cap contacts are clean
Check there's no air leaks on the carb/manifold gaskets
Check there's no leaks on manifold plugs

replaced plugs, cleaned rotor cap and contacts. looked a bit scored on one corner of each contact in the cap.. haven't measured the leads yet. had enough for the evening replacing the starter motor

[miniGTS]

I have a similar issue. In my case it's 1 and 2 running lean and 3 and 4 rich. 1 is more lean than 2. I have newish accuspark, rotor and cap, newish leads, newish plugs. I haven't checked for vacuum leaks yet but gasket is newish and carbs rebuilt and reasonably balanced from what my limited experience with tuning carbs and a length of tube tells my ear.

As a test I swopped the dashpot assemblies to see if it made a difference and it didn't.

Is it possible that my valve clearances are out? Or unlikely to be valve clearances?

Edited by miniGTS, Today, 05:42 PM.

[imack]

It sounds like one jet is stuck down or set up lower than the other.
Remove the suction chambers and set both jets to the same height below the bridge using a digital vernier gauge.

[miniGTS]

It sounds like one jet is stuck down or set up lower than the other.
Remove the suction chambers and set both jets to the same height below the bridge using a digital vernier gauge.

I've done that.