UK_Lee's Starter-Clutch investigation.

The Starter Clutch's WILL interchange! -As long as you keep it complete with it's gear. The gear itself is the same - same number of teeth , same pitch , same diameter - BUT - the machined collar that the 'clutch' grips on are of different diameters. Hence if you use an 1127 gear, you must use an 1127 clutch - and the same with the 1052.

We tried the 1127 unit on a 1052 crank - fits perfect! Just to check, we put the 1052 starter on an 1127 crank, again a perfect fit.

The bore of the gears are the same - as is the overall height of each unit. They will definately interchange without any problems!

The 1127 unit is a far superior design, as mentioned above, it uses multiple rollers (about 40, NB - the correct term is a 'sprag' clutch) - the rollers are housed in a machined billet steel case, about 4mm thick.

The 1052 uses only 3 lage rollers & springs, and is housed in a thin steel plate (about 0.8mm thick) casing - which makes the 1052 unit very weak indeed. If you look closely at the 1052 unit in the pics (sorry about the blurred ones!) you can see where the springs/rollers have actually punched out of the side of the plate steel case.

The 1052 unit in the pics is completely shagged, all 3 springs have made a break for freedom through the thin casing, and the effective pressure on the rollers is drastically reduced. The starter clutch will 'slip' in this condition, and i suspect thats what is happening to Ali's unit.

So the good news is, the now he (and all the other 1052 owners) can safely uprate to an 1127 unit - and it's a bolt on mod -I know- I've proved it!

The other thing is, i'd expect it'd be easier to get hold of a used 1127 unit anyways - looking at the design, and from past experience, i'd have no qualms whatsoever about fitting a used 1127 starter clutch, in fact i'd rather have a used 1127 one that a new 1052 unit.



All praise gratefully received!