Not Really a China Bike but... BMW 750 Airhead question

Ok my buddy has this 74 BMW 750 airhead which was left to him by a friend that had passed away. Now the bike is in fairly good condition but it sat for a while while my buddy was sick and plus a year after. we finally manned up and picked up the bike.
We have it started and running and does pretty good tooling around except i think a gasket or seal in the left hand carb is bad.

When ever he makes a left turn in he pi$$3$ fuel. We havent taken it to the BMW repair shop or taken the carb apart.

Any ideas on why it would do that.

Thanks

Gardo,
I'd guess it is the float bowl gasket or maybe the float is set too high.
Example at:
http://cgi.ebay.com/ebaymotors/BMW-A...-/220734298035
Not saying this is the right size gasket kit.

Oh, you know the rule, the bike does not exist without photos.

I'll see about him sending pics of the bike

And the Pics have arrived

http://i122.photobucket.com/albums/o...s_Bike/004.jpg
http://i122.photobucket.com/albums/o...s_Bike/002.jpg
http://i122.photobucket.com/albums/o...Bike/001-1.jpg

I think your problem is that the engine has fallen over onto its side?

Would be handy for keeping your feet warm on I suppose.

gardo,
Nice looking BMW. Thanks for posting the photos.

Quote:

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Originally Posted by barnone

gardo,
Nice looking BMW. Thanks for posting the photos.

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Thx barnone the idea is to get her back up and running right. the only customizing we'll be doing is stich work on the seat that will say "in memory of Draco"

Isn't that the engine that Jim Bryant retrofits into his CJ750s? If so, he's the guy to ask about this fuel leak. (And that also makes it a Chinabike question.)

Check out Jim's work at www.bmwsidecar.com

Now thats an awesome website

Awesome bike dude great story. Grab a repair manual for it and jump in. :thumbsup:

Quote:

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Originally Posted by jape

I think your problem is that the engine has fallen over onto its side?

Would be handy for keeping your feet warm on I suppose.

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Lol.

Thank you very much of the pics of the old BMW.

I was very close to buy BMW R75 like this:

http://www.ohtm.org/albums/album532/71Bmw_2.jpg

She had front disk brake and original side bags. The seat has been changed too to awesome comfo seat.

She was so beautiful and perfect I had to use all will power I had to not buy her and get a real adventure! Only after reading how much it would cost to rebuild transmission and cardane I managed to give up.

Man, don't really want to memorize it. It was more like once in a lifetime chance I missed.

Very common on carburetors. The carb is over flowing due to either a stuck float or the inlet needle valve has been damaged. I suspect the latter..

What you need to do is to dis-assemble the carburetor and clean it thoroughly, and then possibly adjusting the float level. You should buy a carb rebuild kit (not expensive) and rebuild it to be 100% sure it is fixed.

What has probably happened is the fuel has gummed up given that it has been sitting for quite a time and the fuel inlet needle valve (controlled by the carburetor float) either has some varnish build up on it causing it to not seal, or the rubber itself has deteriorated to a point that the float bowl valve will not close once the float bowl is full or there is some crud from the fuel tank (rust usually) that has gotten in there and is not allowing the carb fuel inlet valve to shut once the float bowl is full.

If in Beijing, I'll offer to clean it and rebuild it for free as long as you buy the rebuild kit and a couple beers along the way. 2 to 3 hours of work to do it right and adjust it. Not an expert...but I like tuning and playing with carburetors for some reason ....

papadad

Quote:

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Originally Posted by papadad

...If in Beijing, I'll offer to clean it and rebuild it for free as long as you buy the rebuild kit and a couple beers along the way. 2 to 3 hours of work to do it right and adjust it. Not an expert...but I like tuning and playing with carburetors for some reason ....

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Now that's a post with style! You'll have a lot of friends in this forum, especially our friends in Beijing!

This also gets me thinking: In California I was privileged to join several "tech days" organized by buddies who, like me, ride a KLR650 but, unlike me, know a whole lot about that very wrench-friendly bike. Now that we have a quorum of JH600 owners here in Shanghai, I'm thinking we should be organizing regular tech days to share info and teach each other about mods and maintenance. It would seem there is similar potential in Beijing.

This forum is great for sharing knowledge, but there's nothing like doing a procedure on your bike under the watchful eye of someone who's done it before.

cheers

papa, thanks for the info, if i was in beijing i would take you up on that offer, esp the Beer LoL