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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
32mm info
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<blockquote data-quote="Nigel Spaxman" data-source="post: 95897" data-attributes="member: 2907"><p>I started with some castings from Terry Prince. I machined them with a grove that matched the rubbers perfectly. I bored the outside end to 34 mm and then made a sudden step down to 32mm then tapered to 30 mm at the head. I like the sudden step, it think it makes the bike go faster. (just like on the Goldstar). Some racing Amal carburetors had a small step built in (10TT9 and some GPs) I have found on manifolds grooved properly that the rubbers are not a problem. It doesn't work when the groove is wrong. It turned out the front carburetor was to far back to fit in the cut out in the tank, so I had to shorten it. I put a small bronze pulley ontop of the carb so that the cable can make a sudden bend about 120 degrees. It doesn't help that the Mikuni is quite wide. The MKII might be better in that respect. Also on Mikunis the air screw is always on the right which makes it really hard to adjust it on the front cylinder. (you can get the idle screw on the left) They do work really well though and they are cheap. I have VM 34mm. Starting and idling is excelent as is fuel economy. I could find the settings I used if you need that. I have two front heads also, I found the rear carb was no problem. Manxes and Goldstars don't need rubber mounted carburetors because the float bowls are on rubbers.</p></blockquote><p></p>
[QUOTE="Nigel Spaxman, post: 95897, member: 2907"] I started with some castings from Terry Prince. I machined them with a grove that matched the rubbers perfectly. I bored the outside end to 34 mm and then made a sudden step down to 32mm then tapered to 30 mm at the head. I like the sudden step, it think it makes the bike go faster. (just like on the Goldstar). Some racing Amal carburetors had a small step built in (10TT9 and some GPs) I have found on manifolds grooved properly that the rubbers are not a problem. It doesn't work when the groove is wrong. It turned out the front carburetor was to far back to fit in the cut out in the tank, so I had to shorten it. I put a small bronze pulley ontop of the carb so that the cable can make a sudden bend about 120 degrees. It doesn't help that the Mikuni is quite wide. The MKII might be better in that respect. Also on Mikunis the air screw is always on the right which makes it really hard to adjust it on the front cylinder. (you can get the idle screw on the left) They do work really well though and they are cheap. I have VM 34mm. Starting and idling is excelent as is fuel economy. I could find the settings I used if you need that. I have two front heads also, I found the rear carb was no problem. Manxes and Goldstars don't need rubber mounted carburetors because the float bowls are on rubbers. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
32mm info
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