intake manifold construction

[RS Thornton]

I'm putting this here and in the lounge, just hoping to find someone with the answer.

How do you bond the rubber part of the carb holder to the metal part?

I did not notice before but the carb holders have a metal part and a rubber part. I am trying to figure out if you can separate them and then reconnect them. If I can do this it might be possible to mount a different set of carbs on my royal star. I would take the rubber part that fits the carb and connect to the metal part that matches the head. Any ideas?

[mixelpix]

Re: intake manifold construction

Originally posted by RS Thornton
How do you bond the rubber part of the carb holder to the metal part?

I don't think you want to bond it. you should be able to find a proper gasket or cut one yourself. I did, however, just find that my custom cut gasket had blown to bits from backfiring through the carb, so you might want to find some heavy duty gasket material - valve cover type was what I used (from local auto store.) Looking at the replacement one I have since fitted, it is pretty thin and seems to have some kind of metal worked into the material.

the carb holders have a metal part and a rubber part. I am trying to figure out if you can separate them and then reconnect them.

I don't think so.

If I can do this it might be possible to mount a different set of carbs on my royal star. I would take the rubber part that fits the carb and connect to the metal part that matches the head. Any ideas?

I'm sure there is a way. might not be pretty, but there's a way... Avoid the gooey substances though for this kind of work. Perhaps you could use the stock air boots and figure a way to connect the bigger carb venturi port to the stock boot. Prolly easier than working around the limitations of the existing cylinder head bolts. Prolly also a good idea to keep the distance between the venturi and the head as short as possible. You can test for air leaks in your connection by pouring or spraying starter fluid around the connections and see if the rpms increase. Be careful when using aerosol spray cans - don't let the spray enter into the air intake side, then your rpms will increase because of that, not a leak you might have. And have a fire extinguisher nearby! I might be wrong here, but considering the jetting for WOT you may also need to factor in the size of the stock port vs. the new size of the carb for performance with the throttle wide open (WOT).
Good Luck
-pdk

[Dennyz]

It may be possible to fabricate an adapters that adapt the boots from the carbs that you want to use to the Royal Star's head. Like the old four-barrel carb adapters for cars, but in minature. Not familiar with the Royal Star, I am only guessing.

[RS Thornton]

I think I have to build a custom piece out of aluminum and then use something like a 1' piece of heater hose to connect. I found a picture of something like it on a Vmax that had 41mm carbs instead of the Vboost. Going to give up on a spring roll out though, I have 4 bikes and only 1 is ready to go and spring is too close. I'll get the bikes back together and try again next winter.
Thanks for the help.