Learning about these carbs.

[LT]

With helpful comments from members (thank you guys) and finally getting a hold of someone from Keihin and what they described over the phone, my confusion about these carbs is clearing up.

Here in these updated pictures is what I understand about the doo-hickeys and orifices on this carb.

If anyone agrees or thinks I'm wrong, chime in please.

[Barry_M2]

No no no.

Generally the take off's to ballance carbs are on the inlet to the head, where the carb rubbers mount onto the head. Will usually be either covered with a small bolt, or a small piece of hose with the end blocked. Well, on the ones I've seen anyway.

[BFG]

What you have labelled as the choke 'nipple' looks the fuel feed pipe. The choke is the arm just below the 'CR' letters cast on the body. The 'black nipple' is the bit at the end of the arm, on the left side of the pic. Operate the arm to see it slide up and down.

The choke adjustment is via the fixings on the arm. Either the position of the pvot or the screw on the end. If the screw on the end, looks like there is something missing. You need a diagram from the OEM I think.


Re no,no, no.

Different ball park. As said - The mixture take offs will be on the manifold, but these are used for measuring the mixture.

The mixture screw is what's used to adjust the slow running mixture. A.k.a Idle mixture screw.

Not sure whats under the caps indicated, but these seem a little high on the carb to be the idle screws. I would leave them alone until you know for sure.

What's under the bit off sealing goo down the bottom next to the N in Keihin? That looks like a removable seal to me. And is closer to where I'd expect the mixture screw to be,

But - I haven't played with these carbs before. What's the application? Are you swapping carbs on your bike? And the age old question - which bike?

[Kickstart]

Hi

Those are not the vacuum take off point for balancing the carbs. Those caps are over the end of the bar that operates the throttles. Basically the bar turns and pulls up the throttle slides. I do not know, but possible that there is something under that cap to allow you to adjust the connection between the bar and the slides to synchronise them (ie, balance them), but this is unlikely. I would expect the adjuster to either be between the carbs on the bar or under the caps on the very top of the carbs.

I agree with BFG on his choke comments. Fairly certain they are not the fuel feed, but not a clue what they are for.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[BFG]

[Kickstart]

Hi

Found this labelled exploded diagram of your carbs that might help.

https://www.motorcyclecarbs.com/keihin/frames/CRSframe.htm

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[BFG]

That was helpful Keith

The idle mixture screw I believe is left side pic, right hand side, half-way up. No 44 "air screw" in diagram. So, no cap removal required.

That black outlet would be in the right position to be an overflow outlet. If so, just for running tubes to the underside the bike.

[Barry_M2]