Wico Impulse mags

hi colin i recently bought a wico A mag for my bristol crawler. Its a twin cylinder version, and the rotation was the wrong way, independent ignition supplys reconditioned it and changed the rotation for me, i am not sure what they had to do but it is possible gary millward

It can. You need the other rotation cam and either get another or modify the flange so that the impulse stop pin is on the other side. You may just be able to rotate the flange through 180deg. For your wallet's sake don't get Ind. Ign. to do it!! ttfn Roland

I also would'nt advise using ind ign to do it. It cost over =A3300 to do mine but due to the rarity of a mag to fit a jowwett engine' it left me with little choice. Gary M

"Colin Jacobs" wrote:-

Changing the rotation of the mag is just a matter of fitting the right cam. The impose drive itself is a little more complicated - first the spring has to be removed from the outer barrel and replaced the other way round (a jubilee clip makes a good spring compressor). Then the driven member is replaced with one for the appropriate rotation (the orientation of the ears which engage with the barrel different) the catch plate itself can be simply turned over. Then finally the stop peg must be moved to the other side - probably by fitting the appropriate flange or end plate.

what direction does it currently go? and is this the early A or the A1. i might be able to help with remains of wico's and cams.

thanks Martyn

I take it the Jowett is an air cooled flat twin? If so, there are many possible alternatives as horizontally opposed engines were a pretty popular configuration. Coventry-Victor, Norman, Stuart Turner, Petter, Douglas, Onan - all made 180o engines. Further, vertical twin two strokes (like Stuart Turner P55's, for instance) also use the same magnetos.

regards,

Kim Siddorn.

"gary millward" said

I also wouldn't advise using Ind Ign to do it. It cost over £300 to do mine, but due to the rarity of a mag to fit a Jowett engine, it left me with little choice.

Kim The engine is a flat twin, but its watercooled. I probably jumped the gun a little with this mag. I bought it off ebay as it looked to be the correct one with the jowett coupling etc, upon delivery i found the rotation to be the wrong way. The info i got from ind ign was that there were only three specs of wico mag that were fitted on the jowett engine, but not fitted on anything else, it looks like i was seen coming.

regards Gary

Ah. To be fair, they were only responding within their brief, I suppose, but a little voluntary information could have saved you drinking vouchers.

Could I be rude and ask you what it cost and what they did to it? I've heard they are expensive, but never in detail.

regards,

Kim Siddorn.