3 replies to this topic

[MR-SKIMMED]

I have recently replaced my inertia starter with a recon one from a motor factors & now i have a rough? starting noise

I previousley had this solid bodied type
http://www.minispare...ty=pb&pid=38390

& i now have this type with the removable clamp
http://www.minisport....au/prod264.htm

As the adverts state, the minispares one is 9 tooth & the minisport one is 10 tooth, i can only presume the pitch/number of teeth is not compatible with my lightened non verto flywheel or is it just a duff starter?

[bmcecosse]

The clamp type is a very old unit! They went to end-on brushes many many years ago! But both 9 and 10 tooth should be ok - although 9 is better because it is lower geared!

[tiger99]

To get the gears to mesh, some compromises have to be made. You can't have a perfectly formed 9 tooth gear, and a perfectly formed 10 tooth gear, meshing with the same ring gear, with the same centre spacing. The design of gears with such a small number of teeth has to be compromised anyway. Proper involute gears should run nearly silently, but those never will. Because it is only the starter, which is used for a few seconds at a time, that is ok. It may be just that the tooth profiles do not conform very well, plus the ring gear will have been worn to match the profile of the old gear.

If you pull the starter out, and check for obvious damage to the pinion and the ring gear, or the presence of metal particles, and none are found, it is probably nothing to worry about.

Different problem, different ring gear design, but a while back I changed a preengaged starter and the new one sounded very different to the original, although it looked much the same. Presumably just new gear running on old, because it worked well for a very long time.

[MR-SKIMMED]

Thanks for the answers, cheers

I will take it back & get it changed for a like for like 9 tooth that i used for the surcharge, i think the 9 tooth will be better as i dont want the ring gear to wear to a 10 tooth then have to replace it in the future to a 9 tooth & it be sloppy or have the problem of hunting down another 10 tooth. I dont think i could live with the noise of the 10 tooth anyway, its the same kind of noise as you hear when someone is trying to start their car when the engine is already running it cant be good for the ring gear