Propane check this out

These Lehr trimmers were mentioned here awhile back, and I think they are a great innovation for what they are.

The engine they use is a Subaru EH025, with what I understand is a Lehr developed propane delivery system. For a few minutes of trimming every week I think they are an excellent product. They run clean, start easily, and have no "spring tune up" carburetor issues from the cruddy car fuel that we now have to put up with.

One of the drawbacks for using one on a motorized bicycle is that they only use a 1 lb. propane cartridge, which has somewhere around the same amount of energy in it as a pint of auto fuel. Also, engines converted to propane have about 10% or so less power.

If I were going to try to build a propane bike engine setup, I would take the Lehr fuel system off of a trimmer, adapt it to a larger EH035 engine, and come up with some sort of refillable tank of around 3 to 4 lbs. Then maybe you'd be cookin' with gas!
 
Lehr propane powered scooters and Karts? COOL!!!

The issue I have with the 1 lb. disposable propane tanks (which these GoPeds use) is their cost.

You could probably make up a dual 1 lb. propane tank setup that feeds from one tank first and then automatically switches over to the other tank. There are valves that do this that have been used in the RV industry for years. You would still have that issue of the very high fuel cost when using disposable bottles. I know that there used to be valves sold to refill those disposables, but I doubt that they are legal anymore (if they ever were).

Actually, a 3-4 lb. tank wouldn't need to weigh much more than twice what a 1 lb. tank would weigh. There are probably requirements that refillable tanks need to be made much heavier than the 1 lb. disposable tanks are though. I know there are aluminum propane tanks available, and they are somewhat lighter than steel tanks.
 
Hello, would the BMP kit work with that Subaru ECO 25cc motor.

Not without swapping out the 78mm drum and redrilling the channel. The Robin 25cc and most all the utility engines under 30cc come with 54mm clutch shoes.
Staton does make 25cc engines available and his FD channels have two sets of holes and are drilled for the smaller engine clutches as well.
 
Heh, still found at good 'ol HF:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=45989

Legallity of doing this though determined on a state by state basis.

If your going to refill small bottles, take some advice... They are easy to over fill and have a pressure relief valve in them!

Get a store bought bottle (full) and make a simple balance scale, so that you know when your bottles that you replenished are full! If not, you might be in for a surprise on a hot day when the gas expands out of the safety valve!
 
Not without swapping out the 78mm drum and redrilling the channel. The Robin 25cc and most all the utility engines under 30cc come with 54mm clutch shoes.
Staton does make 25cc engines available and his FD channels have two sets of holes and are drilled for the smaller engine clutches as well.

Thanks for the info on the smaller cc engine clutch shoes, and Staton option.
 
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