Bitch on gas... Carby maybe? Help lol

[antiskeptic]

Hey guys, I have a tb42 on duel fuel, I've had issues with gas for a bit now, but now it's real bad. Runs fine (idles rough) on petrol. Seems like I'm getting no power below 3000rpm. Coughs splitters and feels like nothing is feeding through on gas. Once up and going at a decent rpm it goes but you can feel it straining terribly. Carby rebuild? I've done leads, dizzy, plugs etc.. Helped for a wee bit but back to being a bitch.
. Any suggestions are appreciated

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[threedogs]

Only need a hole for gas or as they call it now a mixer, 99% of any gas problem is 12v IMO
Try bleeding air from water side, may be creating bubbles or cavitation,
Park nose up invert coke bottle radiator filler to check, say it again all LPG 4x4 should be running these {see pic}

[antiskeptic]

Thanks for that, slightly lost on the 12v Imo bit... Lol. And the 3 way peice what's it do and if they are worth their weight where do I get one? Bj bearings or something similar?

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[threedogs]

Yes I would think so, If you use "Tee" the flow of water is restricted at TEE,
Gas likes it slightly advanced too BTW, Gas does not go through your Carby either Mixer
or via sequenctial injection. Butterfly /diaphram on carb controll input.
Convertor made need a kit put through it using carbie cleaner.[Messy]

Not sure if on Google or not, but try looking up John Bennet water pumps.
We spoke for 4 hours just on the cooling system on 4x4 and cars.
Absolute god on the subject, retired now so all this knowledge lost, sadly

[antiskeptic]

3 dogs you always come to the party... Your a gent. Thanks mate ill pass this info on to my mechanic as I'm not screwing with lpg

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[Uncle Festa]

Could be a vacum leak. My Gq TB42 had one recently. Mine is EFI so many places for a leak. But yrs is carby? Still plenty of places for leaks. Look for splits close to where hoses fit up to manifold, air intake, anywhere vacum hose fit up to something. Also make sure no leaks between gas receiver and carby/ manifold. Only needs to be a small leak to create a problem. Also you should be running a hotter range spark plug/s and need to check plug leads and be using good quality leads at that. The fact that has a rough idle on petrol, points to vacum leak. But could also be points or other thing/s. How long since you replaced the points, or does it have electronic ignition?

[antiskeptic]

Thanks for more info I'll check those hoses. Yes it is a carby and I have an electronic ignition fitted. I'm running good ngk leads and sparkys and probably only changed them a cpl months back

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[GQ TANK]

Also consider a pertonix ignition & extended rotar button.

Also try shaking the carby - the base bolts or the screws thart hold the bottom butterfly assembly may be loose. If the scews are loose - remove the carby from the manifold - flip it and tighten the 3 screws

I had this on my RB30 carby )simalar to the tb42 crby)

[dubizzle@bresson.org]

Hi, have you checked the "basics"? Filters, visual check for any leakage, etc. Is there any trouble (sounds or visual) when starting the engine?
This would help us to make a disgnostic
Thanks

[antiskeptic]

Ok. I've got a crow cams electronic ignition. I've checked all the basics. Filters etc are all good, they are all new. Does the petronix ignition have advantages over others? And what would an extended rotor button do also? Sorry still learning guys

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