Carb type

[mike.perry]

Scroll back to my earlier photos and diagrams

[54woody]

Mike, I looked at the info in your previous post but didn't see anything quite like this arrangement. I suppose I'll have to pull the carb off the engine to have a better look at what's going on under there. Assuming for a moment that the lever is not broken, why would the jet not move down when the lever is activated? Is it common for the jet to get 'stuck' due to something inside getting gummed up, etc?

[Alec]

Hello 54woody,

the pins are retained by slpit pins, you should be able to remove the pivot pin and disconnect the choke cable from the linkage (if still connected). Then you can wiggle the jet and see if it is free. It could well be gummed up due to laquer from old petrol? If so remove the dashpot and spray a releasing fluid or some thinners down the jet and let it soak in. Eventually it should come free, if that is the problem.

Alec

[MarkyB]

Having compared both pictures side by side, I'm with Roy, if it isn't broken it's extremely worn.

[bmcecosse]

You can 'just' see that the short coil spring end of the lever has moved down very slightly - but for me - the jet is stuck (or v v tight) and efforts to pull it down have snapped the lever through the weakest part = where the pivot rivet goes through.

[54woody]

Ah, success! The lever was not broken after all but the jet was stuck and that was preventing the lever from moving any farther than shown in the photos. I removed the dashpot and piston, dribbled a bit of carb cleaner down onto the jet and let it soak for a while. Removed the return spring from the end of the lever and gradually worked the jet up and down. It didn't take too long for the jet to become unstuck. The lever now operates easily and the jet moves smoothly up and down in response.

Next question...I believe the location of the throttle return spring (accross the top of the float bowl) as well as the lever that it's attached to are further modifications by the PO. Where is the throttle return spring normally positioned on an H2 Minor carb and what, if anything, is normally on the end of the throttle shaft on the float bowl side?

[bmcecosse]

Well done - the return spring is best set directly opposite the throttle cable, otherwise it is constantly twisting the shaft and thus wearing the bushes at each end.