Tuesday, November 18, 2014

Le Carburateur Diabolique...

The TY has been a source of significant frustration over the past couple of weeks. As you can see, the bike is finished, but essentially unrideable unrideable. The more perceptive among you will notice the lack of a chain, but that is not the problem.

The real problem is the carburetor. It is possessed. When I stuck the bike in the back of my garage (10+ years ago) it had multiple problems. One of the problems was that it would only run at hysterically high revs. It would not idle and it was not very interested in starting. Those same problems exist.

First I suspected a massive air leak into the cylinder. So... I removed the cylinder and applied a seal to the base gasket. I also went through the intake manifold/reed cage assembly and again I checked for leaks, and/or torn rubber in the manifold and then I applied a sealant to the gaskets and reassembled.  After all of this, there was no change...hysterical revving persisted so I disassembled the carburetor and cleaned out the idle jet and the main jet. Both appeared to be free from obstructions. I started it up again, but no change...hysterical revving persisted...something was clearly wrong, and it appeared to be beyond my limited skills.

I'm going after this problem on two fronts. First, I have a spare Chinese Mikuni carburetor which I initially picked-up off of eBay for my Bultaco Campera. Dimensionally it is identical to the Mikuni which is presently fitted to the TY (it is the original carb that came on the bike). This carburetor will be installed if my rebuild of the stock carburetor does not help. The rebuild of the stock carburetor will begin just as soon as I get the gasket/seal set from  TY Trials and my new ultrasonic cleaner. I am going to figure out this carburetor.

On a happier note, I have solved the kick-start problem, the new gas tap works perfectly and the Electrixworld ignition appears to work as advertised.

So...I am going to learn how to rebuild and properly clean my carburetor, and if I am just too thick to get that done, I will install a new carburetor. One way or another I am going to ride this bike. It is way to beautiful to set quietly in the garage.

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