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Starting issues R12
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- Posts: 39
- Joined: Fri Jan 26, 2007 3:44 pm
Starting issues R12
I have a 1938 model R12 military with Bing 1/24/12 carburetor and the original military air filter. No choke function...
Problems are starting the bike. I have correct and good spark plugs, can easy change the ignition point for later (retard) and good compression. Even with repeated "tickle" the carburetor, kicks without ignition and different positions on gashandle the bike will not start. It may seem like it is not going fuel to cylinders. The plugs are completely dry even after repeated attempts. I take a little start gas and sprays directly into the cylinder through the plug hole, insert the plug and try and have start attemt on the cylinder.
I suspect simply that the gasoline not come to the cylinders, and perhaps a little narrow mixture. After 15-20 minutes attemting the bike starts and runs perfectly.
But even when the bike is hot I often struggles a lot to start.
Anyone have some experience with similar problems??
Best regards, Frode
You have a Bing on this bike?
Vintage German Motorcycles
www.vintagegermanmotorcycles.com
mike@vintagegermanmotorcycles.com
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- Posts: 39
- Joined: Fri Jan 26, 2007 3:44 pm
Yes, I have a Bing on this
When I started the restauration it was both a Bing and SUM With the bike, but the condition on the SUM was bad.
It is only one Bing, and a manifold.
I think the intake gaskets is in good condition. I have used "startgas" in actual area when the bike runs (idle) to hear if the speed on the engine increase. But nothing happens with the speed. It seems to me more or less the same amount of fuel is still in the float after several kicks at the starter. I can see this when i "tickle" the carb, and gasoline come out of the overflow immediately. No smell of gasoline or wet at the sparkplugs.
Perhaps the smartest thing to do is start dismantel the carb and have a look if I can see some obvious problems.
Best regards, FRode
The correct carb for a single
Vintage German Motorcycles
www.vintagegermanmotorcycles.com
mike@vintagegermanmotorcycles.com
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- Posts: 39
- Joined: Fri Jan 26, 2007 3:44 pm
I am not aware I could buy
What kind of airfilter do you recommend for use with the SUM carb?
Best regards, Frode
Hello, you need 1) Sum
1) Sum Baumuster 769 on carburetor
2) R 11 und R 12 tow carburetor Typ 6/406 SP und 6/407 SP,
Amal Vergaser links und rechts für BMW R 11 oder R 12 (6/406 & 6/407)
3) Bing possible but 2 Carburetor (as a replacement)
Jürgen