D
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Any suggestions for a carburetor to convert the Lehr 25cc 4 stroke to gasoline? Would like to find solution not more than $50.
Silvaire
Member
Awhile back I found a thread on gopednation.com about putting a carb on a Lehr propane engine. There was a mention there stating that the compression of the Lehr was something like 10:1, whereas the Subaru EH025 was something like 8:1.
I'm just curious, why do you want to put a carb on one?
If I were in your position and wanted what you'd have after converting the Lehr, I would put my $50 towards a used Subaru EH025 and have the real thing. EH025's were used on a number of weed eaters and blowers and such made by Makita and others, and they regularly show up on eBay.
I'm just curious, why do you want to put a carb on one?
If I were in your position and wanted what you'd have after converting the Lehr, I would put my $50 towards a used Subaru EH025 and have the real thing. EH025's were used on a number of weed eaters and blowers and such made by Makita and others, and they regularly show up on eBay.
HeadSmess
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any type of 10mm brushcutter carb.
search scrap yards. they breed there...
they do need some modifications.
hooking up throttle cable is the main concern.
(but most parts will swap over, such as throttle arms, choke levers, diaphgram assemblies. depends on what carbs you have in front of you exactly.)
a pulse line on the carb. usually as simple as drilling a hole in the appropriate place on the intake manifold.
a SUPER LIGHT spring under the diaphgram. the intake can only "suck", the spring provides the "push".
usually the needle valve spring pinched from another carb
getting the proper subaru carb works.
if there is any truth in this compression ratio nonsense (the lehr is actually a HUASHENG copy, so why it would be specifically designed with a higher compression ratio puzzles me.... they copy, they dont design. copy. not design.)
anyways, if there is any truth, all the better! more power! and they need it! run 95 or 98 octane
the oil goes black real quick on petrol...
search scrap yards. they breed there...
they do need some modifications.
hooking up throttle cable is the main concern.
(but most parts will swap over, such as throttle arms, choke levers, diaphgram assemblies. depends on what carbs you have in front of you exactly.)
a pulse line on the carb. usually as simple as drilling a hole in the appropriate place on the intake manifold.
a SUPER LIGHT spring under the diaphgram. the intake can only "suck", the spring provides the "push".
usually the needle valve spring pinched from another carb
getting the proper subaru carb works.
if there is any truth in this compression ratio nonsense (the lehr is actually a HUASHENG copy, so why it would be specifically designed with a higher compression ratio puzzles me.... they copy, they dont design. copy. not design.)
anyways, if there is any truth, all the better! more power! and they need it! run 95 or 98 octane
the oil goes black real quick on petrol...
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D
Deleted Member 4613
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I want to convert the Lehr to gasoline because propane is way too inconvenient for extended use on a motorbike. I can understand it for yard use, trimming once every two weeks or so, and I also want to build an MB that meets Illinois law, no more than 1 HP.
Silvaire
Member
I haven't tried a Lehr engine on an MB, but I have several Lehr weed eaters and a blower. I really like the convenience and useability of propane. They start quickly even after sitting for months. They run very clean in every respect.
You can get an adapter to refill the 1 lb. disposable propane bottles from a 20 lb. BBQ cylinder or the like - and doing so would be an economic necessity with an MB. Just carry an extra bottle with you if you don't want to risk the possibility of having to peddle home. The money and the time and hassle of converting your engine to auto fuel would go quite a ways in propane expense.
It is my understanding as well that the Lehr is a Huasheng made engine. As far as the compression ratio thing, I have no personal knowledge. Changing the compression ratio is simply using a different piston. For the quantity of engines involved and everything else that was changed externally to run on propane, a piston change would be a pretty simple matter.
You can get an adapter to refill the 1 lb. disposable propane bottles from a 20 lb. BBQ cylinder or the like - and doing so would be an economic necessity with an MB. Just carry an extra bottle with you if you don't want to risk the possibility of having to peddle home. The money and the time and hassle of converting your engine to auto fuel would go quite a ways in propane expense.
It is my understanding as well that the Lehr is a Huasheng made engine. As far as the compression ratio thing, I have no personal knowledge. Changing the compression ratio is simply using a different piston. For the quantity of engines involved and everything else that was changed externally to run on propane, a piston change would be a pretty simple matter.
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BigBlue
Active Member
Hey,
here's a solution to guarantee you'll never run out of propane
http://www.motoredbikes.com/attachment.php?attachmentid=34766&stc=1&d=1329954605
Chris
AKA: BigBlue
here's a solution to guarantee you'll never run out of propane
http://www.motoredbikes.com/attachment.php?attachmentid=34766&stc=1&d=1329954605
Chris
AKA: BigBlue
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Deleted Member 4613
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Hilarious!
HeadSmess
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when i first got my lehrs i wondered about the rules regarding lpg vessels for a while...cus what if you basically got a (large) fire extuinguisher type bottle...scuba tank?... welded up with a headset and a bottom bracket...would it be certified if the welding is up to standard or break every rule in the book using it as a stressed frame member?
i didnt think of the alternate piston design...oh my... i cooooould do the old oil in the cylinder trick and if someone with a genuine subaru also did the same then we could have a definite answer on the compression ratios once and for all!
i really prefer the lpg idea for the pushy. if anything really goes wrong you can dump them in the back of a car without petrol going everywhere.
and as stated, carry a spare bottle.
does the adaptor to fill the 1 pounders from a big bottle include a spanner for the bleed valve? not quite the same as a tyre valve tool
i didnt think of the alternate piston design...oh my... i cooooould do the old oil in the cylinder trick and if someone with a genuine subaru also did the same then we could have a definite answer on the compression ratios once and for all!
i really prefer the lpg idea for the pushy. if anything really goes wrong you can dump them in the back of a car without petrol going everywhere.
and as stated, carry a spare bottle.
does the adaptor to fill the 1 pounders from a big bottle include a spanner for the bleed valve? not quite the same as a tyre valve tool
BigBlue
Active Member
Seriously,
here's a company that actually sells a Lehr MB kit:
http://www.raincrossmotorbikes.com
Chris
AKA: BigBlue
here's a company that actually sells a Lehr MB kit:
http://www.raincrossmotorbikes.com
Chris
AKA: BigBlue
Last edited:
Richard H.
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They're reselling the Stanton kit w/Lehr engine which he seems to have discontinued.
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