March 6, 2021 at 4:17 pm #13892Darren SetterParticipant
Hi. Does anyone know of a good 2 stroke mechanic in the Bristol area?
I took my normally very reliable Simson S50 off the road last year to replace the kickstart shaft, and while I was at it I replaced the cheap Chinese carb with a new original one. I also installed a new piston/rings/cylinder kit as the exhaust thread was worn on the old one. I also fitted a 12v kit to give me brighter lighting. Everything went back together fine, but no matter what I do it just won’t start. There is a spark, at what appears to be the correct time (using dial gauge and xenon light), there appears to be compression, air is being sucked through the carb, but it just won’t fire up. I’m at a loss as to what to do next, so would be happy to pay someone to sort it out if I were happy they knew what they were doing!
Any suggestions would be welcome,
March 7, 2021 at 1:35 pm #13905SkorpyParticipant
Maybe Kellaway Motorcycles, 168 Kellaway Avenue, Avon, Bristol, BS67YQ ? They were once MZ dealers and had credits in a Haynes ETZ manual I once had. I have no idea if they retain any interest in maintaining MZ’s or similar, equally I have no experience of them.
March 29, 2021 at 8:13 am #13944‘AAA DummyMember
Done all that Darren and more. You have my sympathies. Even fitted a new Mikunu. It fired up third kick – Hurrah but not since, not never.
Tell me does your plug ever get wetted with petrol, mine is always bone dry.
March 31, 2021 at 7:08 am #13951Derek ReynoldsParticipant
Two people with the same problem?
Dry plug – fuel starvation. Check filters in the fuel tap; carb inlet.
Check float needle operation and float position. Check all jets for obstructions. Check for no air leaks between carb and crankase.
Can’t help with the Bristol issue. Shropshire Hills.
April 1, 2021 at 8:57 am #13955Darren SetterParticipant
Thanks for the replies!
The problem was, I made too many changes at the same time, which made it difficult to fault find. Yesterday I swapped the carb for the previous one, which didn’t work, but when I changed back to the new one again it fired up, and is running fine. I did take the new carb to pieces and check everything while it was out, so maybe that made a difference.
April 2, 2021 at 4:31 pm #13959Derek ReynoldsParticipant
I’m sure we’ve all been there and done that at some time!
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