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Eviltwin,
That fitting originally had a hose that went to the airbox to recirculate the fumes from your crankcase. It is supposed to make some smoke when the engine heats up. You can either run a hose back where it is supposed to go (probably the bottom of the airbox) or to a catch can that is ventilated so it doesn't build up pressure, or just leave the endof the hose open to the atmosphere but routed to behind your rear tire (in case it pukes out some oil) or K&N makes a special filter that goes on the end of the hose.
Your other problem sounds like it is probably carburation. If it bogs down after it warms up I would suspect too rich, so possibly float level, sticking needles or gummed up slides.

Ken

AHRMA 412
Vintage racing - old guys on old bikes
 

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Rosko,
I like to do that too. That way I feel like I have some horsepower and can spin up the rear tire like a bad boy. It is one of my poser secrets. It is best if you use a really cheap tire like one of the K81 or K70 knockoffs. They are hard as a rock and can really slide around.
Ken

AHRMA 412
Vintage racing - old guys on old bikes
 

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Joe's right. Check your plugs. What they look like will tell you what might be going on. Black and wet and oily = Bad. Black and gas wet = not as bad. Rusty dry and electrodes missing = replace your plugs. Post what they look like. Filthy air filters = Bad. If you use individual air filters you will probably have to rejet the carbs, but OEM air filters are expensive (and ugly). What are you going to do with the bike? now might be the time to start on modifying it so replace the pipes too as long as you are going to rejet anyway.

Joe is also right about the 50psi trick. I wish I had remembered that one. It is the best when you seat a new tire using lots of PSI and then forget to reset the pressure. That in combination with the mold release compound and not pumping the brake back up can be very entertaining for everyone involved.

Ken

AHRMA 412
Vintage racing - old guys on old bikes
 
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