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What Mikuni Carb is this?
Posted: Sun Oct 30, 2011 1:37 pm
by Herman T
Could anyone tell me for sure which carb this is? It is from my dragbike. The opening on the intake side is 33mm. I'm thinking it might be a stock carb from an earlier GT750, 72 or 73? Stamped on the carb near the choke are the numbers 310 and 13L.
Re: What Mikuni Carb is this?
Posted: Sun Oct 30, 2011 3:53 pm
by water cooled
Re: What Mikuni Carb is this?
Posted: Sun Oct 30, 2011 4:01 pm
by water cooled
There are a few guys on this Forum that are very good at identifying stuff....but here are my 2 cents....
That brass nipple on the motor side of the carb throat might have been for the SRIS system though it seems a bit big for that. Does your motor have the SRIS system still intact? I know on the 1974 block, the L SRIS came underneath and went into the intake tract within the block. This is just a guess....but it might be a 72 GT carb.
Re: What Mikuni Carb is this?
Posted: Sun Oct 30, 2011 4:14 pm
by tz375
They appear to be stock 72/73 zinc bodied carbs. Those small brass barbs are a breather connection IIRC abd the odd "powerjet" type drillings are a breather to teh float chamber. It was a way to tilt the fuel curve.
Look for a set of 38mm TM flats from a sled and jet them to suit.
Re: What Mikuni Carb is this?
Posted: Sun Oct 30, 2011 9:07 pm
by Herman T
Thanks guys. For now, these carbs will have to do as long as they work. I am sure in the future though, different carbs will be on the bike.
Odd thing is, the main jet is a 132.5. It was mentioned to me that this might be because of the 3 into 1 pipe. The jet is brand new. I haven't checked the other carbs yet to see what is in those. I would think that whoever put the new jet in would put the same one in that was there before but I won't know that for sure until I look at the other carbs.