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by maxwestern - 25/04/24 10:58 AM
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Joined: Jan 2016
Posts: 7,466 Likes: 143
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Here is a step by step detail of how to get a LM carby to work properly, G4 is at the end of this post, only difference is the cam modification, all other steps are the same You will require a 6mm or 1/4 tap and two 25mm bolts (cut both of these to 18mm), 1 nut of whatever thread gauge you choose. You also need a kill switch, this can be either a momentory contact switch or toggle switch, a little bit of electrical wire, lug and a connector It requires a marker, hacksaw and 2 sockets to act as spacers to hold the cam steady in a vice, do not over tighten the vice as this will damage the cam Thread this with a 6mm or 1/4 thread (whatever matches the bolt you have), cut this bolt to 17/18mm long
Last edited by NormK; 04/02/17 11:15 PM.
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1 member likes this:
Seanoss |
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Last edited by NormK; 04/02/17 11:16 PM.
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Joined: Jan 2016
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Last edited by NormK; 04/02/17 11:17 PM.
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Colrose |
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Joined: Mar 2008
Posts: 612 Likes: 1
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Thanks for going to the trouble of doing this, this will keep Powertorques running for another 30 years.
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Colrose |
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Not only the Powertorques Tiger, all those full cranks fitted with the G4 carb
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Joined: Mar 2012
Posts: 585 Likes: 8
Qualified Senior
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well done. that seems to be a major improvement.
If my collection is complete ( then how come i keep buying stuff ? ) 🤔🤔🤔🤔🤔
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Joined: Nov 2016
Posts: 98
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Very interesting stuff ! Thankyou for sharing it.
Yesterday is history Tommorrow is a mystery Today is a gift That is why it is called the present.
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Joined: Feb 2006
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That's certainly given us viewers a better idea of what you are talking about. You have made a very clever ( in some ways) carby reach it's full potential. Is it possible, just possible, that you have made it better than the G3 carburettor??
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
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Joined: Jan 2016
Posts: 7,466 Likes: 143
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Mowerfreak, not sure if it is better than the G3 and it doesn't really matter, there is buckets more of the plastic carbs out there, if you do this mod correctly the carb is guaranteed to work and that is all that matters
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Joined: Jan 2012
Posts: 1,842 Likes: 14
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Is it possible, just possible, that you have made it better than the G3 carburettor?? It would be necessary to run some dynamometer tests with Exhaust Gas CO or O 2 monitoring, to answer that one. In any case, it's a moot point, as G3 carby spares are in the process of drying up - they have long been NLA from Victa, and at least one of the two major aftermarket OPE spares suppliers has now deleted most of them [GA Spares]. Many thanks for your superb how-to, Norm.
Cheers, Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
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Joined: Feb 2006
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I hate to think how many Victa pumped out over decades, but you are right, , of we spread the gospel that these things can actually have their bugs removed, we would at least partially stem the rapid ( and I mean RAPID) disappearance of this Aussie iconic backyard noise.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
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Joined: Jan 2016
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Mowerfreak, one thing with this mod is the iconic backyard noise does not need to be so loud if the Powertorque is not revving its tits off mowing grass that is 1" high. Gadge, my son is over from NZ and IT is his game so that is why it is clear, I just did the leg work
Last edited by NormK; 06/02/17 04:46 AM.
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Joined: Jan 2015
Posts: 1,233 Likes: 32
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Hello NormK, I will save this and do it on my new PT project. I just have to sort out my base. it a lot of sanding , but will get there soon.. thanks for your effort. speedy
........................Keep your blades sharp......................
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Joined: Jan 2016
Posts: 282 Likes: 1
Greenfield Enthusiast
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excellent work Norm,we can all save a two stroke now thank's to you..cheer's
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Joined: Feb 2006
Posts: 4,675 Likes: 164
SENIOR TECHNICIAN
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Does this result in a first time every time starting experience or do you still need to work on getting a strong spark and good sparkplug for that to happen? One think I remember with a near new Power torque was the ridiculous ease in starting. You could do it with your teeth.
Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!
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Joined: Jan 2016
Posts: 7,466 Likes: 143
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Coils on Powertorques rarely fail or give trouble and the carby has little control over the spark plug. If all the ducks line up they are usually a one pull start, unless the useless float needle is giving problems and I have little control over them because they are just expensive to buy,cheap Chinese junk and poorly made
Last edited by NormK; 08/02/17 04:44 PM.
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Joined: Jan 2016
Posts: 7,466 Likes: 143
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Another mod I did on an LM today, because the owner wanted to retain the kill switch was to drill and tap through the kill switch ramp on the cam in the same manner as I did with the G4 cam and this then allowed me to adjust the kill switch position and prevent it from running up to the flat on the top of the ramp and becoming stuck which results in having to pull the carb apart to free it up again. So far it is working well
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Joined: Jan 2016
Posts: 7,466 Likes: 143
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Getting back to the float needle problems I might have a crack with these and see how it works out. Getting the brass needles made they came back with a stupid price of $35 each. These are a bit better priced. http://www.ebay.com.au/itm/252780607048?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
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Joined: Jan 2015
Posts: 1,233 Likes: 32
Junior Technician
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Hello NormK, Did the mod, works well, smooth power. I used a fine hacksaw and got a really smooth surfaces on the gray part... speedy
........................Keep your blades sharp......................
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