|
Post by rustyrescue on Mar 17, 2023 17:21:18 GMT
Thanks, carbs off yet again haha! do you know where the pilot circuit runs on it? I thought I had blown everything through.
|
|
|
Post by johnjones on Mar 17, 2023 18:08:57 GMT
I have not read this thread from the begining, which funnily enough strongly mentions left misfire/dropping out...
You have eliminated a HT loss with a pair of red neons ?
I would not put the float chamber bowls in an ultrasonic bath to safeguard the overflow tube from possibly splitting.
For your own interest( and others), track ever carb drilling/passageway with photo and description, oil can method can/has shifted some crap blockages as well as carbs submerged in redex fuel/carb strong mixture for a few days, chemical cleaner...
Once you have routed all passageways, air as well as fuel as well as mixture, you should be able to understand how the carb works in detail...
As you know some jets some with diffusure tube and holes are pressed/shrunk in place...
Take note of the comment about the brass mixture screw O RING and the possibility of a bit of it blocking the works...
I wonder what those two holes are, some progression to be made methinks...
Going into detail will help you...
|
|
|
Post by rustyrescue on Mar 17, 2023 18:37:51 GMT
thanks, yes I will take left carb right down again! I feel sure it must be pilot circuit somewhere, It fails to run on left idle speed where only the pilot circuit is in use I think? The left cylinder coes on song as it approaches 3000rpm OR by pulling the choke out which also raises the revs to fast idle but both cylinders work then. The plug on the left cylinder after a 4 mile run was not looking right either...the right one was perfect. Yes HT is good...proved that and it also had coils etc in the recommission.
|
|
|
Post by rustyrescue on Apr 23, 2023 19:18:11 GMT
after looking at it laying in the garage in disgrace I had another go today, carbs off again. All seems good, the idle mixture screws are good as are the o rings. The passage way into the carb is clear, the idle jets are clean and good and carb cleaner dribbles through them clear. Bike starts on choke and runs on both, the down pipes before the collector both warming up. As it warms and I drop it off choke it idles but only on the right cylinder. So and issue is still there! Doing my head in this one as refresher. valves were set, new coils/leads/plugs and I have switched over to prove it is not caps/leads/plug etc. Compression good too on both. Wider throttle and it runs on both cylinders. I think somewhere there is a blocked passageway on this carb in the slowrunning circuit. Off they will come again. Baffled!
|
|
|
Post by buster on Apr 25, 2023 19:57:16 GMT
I'v never tried this trick myself but how about mixing some redex and petrol (50/50?) and filling the float bowls with that mixture and then leave it for a few days. at this point I personally would pull the pilot jets out but I'm a thug and its not easy to do...
|
|
|
Post by johnjones on Apr 26, 2023 10:01:58 GMT
This method has been mentioned many many many times before, and even in this thread.
I cannot afford a 50/50 redex/petrol mix even when redex is on offer in the likes of Lidl etc..
After the carbs "outside' crap has all been removed, I totally submerge the stripped carbs in a strong mix of this redex/petrol mixture in a suitable container adding clean objects to displace fluid, an economy measure, and leave for a few days, lifting out the carbs and resubmerging three times a day.
It works.
I also use the squerty oil can and oil method to make sure all drillings etc. are clear.
Messy but works for me.
To further aid economy, get some long float bowl screws to make "feet" so carbs are partially submerged and passages filled with the redex/petrol solution.
The amount of crap seem on the container floor can be quite surprising as well as the colour of the solution, "coke" like.
I also like to add a mix of 2t oil, redex and valve seat protector mixture to every tank of fuel, a tomato sauce bottle lid full X 2 for a tank full.
Works for me.
Have you sussed out where all the passages go and what function those progression holes Do ?
Filling a fitted float bowl with the solution fluid will not fill up the "raised" drillings with the mentioned chemical cleaner.
I assume the carb throttle butterflies are "balanced" ( bench balanced using balls ).
What vacuum value is shown on the gauges ?
|
|
|
Post by rustyrescue on May 9, 2023 11:30:30 GMT
This is doing me in!! I have tried everything, I can remove and replace those pesky carbs blindfold! I feel sure it is left carb idle circuit.
Both carbs stripped/soaked and cleaned many times. Air blown through every hole I can! The pilot/idle jets being pressed in have remained in place......so far! not easy to be certain if they are properly clear. The rubber bypass diaphragms replaced new.
I have now got it idling on two albeit a bit lumpy BUT only by fiddling. I have raised the idle knob too high really...but then settle the idle down by backing off the right carb on the balance adjust. So in theory the left carb is running with the butterfly marginally more open than the right one. It idles at about 1300rpm on 2 cylinders but a little off balance on my gauges.
Open the throttle and the balance gradually evens out as you would expect until at about 4000rpm plus it is only very slight.
This is not the answer....another left carb would be better to try really and prove the point.
|
|