42cc engines?
 

I have a couple of 42cc engines off of my kids trashed scooters. Does anyone have any experiance with these engines. The engines still run strong. Is there any conversion possibilities for this engine? They had a gear reduction on them which can be removed. I wonder if any homey conversion parts would fit this engine. They are a no name chinese made for sure. They resemble all the pics on the importers web site but since they are about 3 years old they might be a 30 or 33cc, hard to tell physically.

RE: 42cc engines?
 

The 42cc poulan mad a decent conversion for me. Easy to do as the engine falls out of the saw they came in. Mounts just like a glow motor on a Hangar 9 mount. Made a couple of parts and away it went. CH makes a conversion kit as I recall that was pretty cheap.

RE: 42cc engines?
 

I read some time ago...some of the converted Poulan 42cc engines ran strong...and like Tim said, easy to convert! Best regards, Capt,n

RE: 42cc engines?
 

he's talking about scooter engines, as it says in his post...

RE: 42cc engines?
 

After further investigation they are probably 18 to 23cc engines. I cannot find any markings at all. The carb has RUI*ING and the nubers on it are 307121014. The flywheel has the cooling fins on the inside towards the engine and the adapter for the carb is not pictured. Does it look like this engine could possibly use any conversion parts designed for another brand such as homelite, Ryobi? The coke can is for comparison purposes, it is not part of the engine[sm=wink_smile.gif]

http://image2-6.rcuniverse.com/e1/ga.../lg-121671.jpg

http://image2-6.rcuniverse.com/e1/ga.../lg-121672.jpg

RE: 42cc engines?
 

My bad I, was thinking Poulan. [X(]

RE: 42cc engines?
 

Can you tell anything about these two engines from the photo? They have the number 32 engraved on the coil mount.

RE: 42cc engines?
 

They look like 32.6cc duropower engines. Low cost high power engine.

RE: 42cc engines?
 

Box car, do you know if any conversion parts will work on these engines that are built for other brands?
I don't know if it helps any but the pistons have 2 rings. Before I removed them from the scooters I checked the compression with the ease of the pull start and the one pictured had 125.5psi and the other 126psi. You can still see the crosshatch pattern on the cylinders.

RE: 42cc engines?
 

They are an easy conversion. I put EI on mine and a prop hub that was it.

RE: 42cc engines?
 

I would like to put an EI on them and would a prop hub have to be cut for it or would one for a Homelite or Ryobi or something else fit it? I would also like to install a pitts muffler. I could get a little carried away and go pay my wifes cousin a visit and see about cutting a twin crankcase since he owns his own machine shop, unless someone already has one laying around that they do not want;)

RE: 42cc engines?
 

Box car, I found your post from 2006 about this engine, it seems like you never gave any reports on it as far as performance and parts used.

RE: 42cc engines?
 

I guess I scared everyone away by asking to many questions:D

RE: 42cc engines?
 

if you still have the flywheel just cut out the center with a hole saw,take it to your wifes cousin and tell him to put it in the lathe and dress it up.what are the thread size.should be mm 8x1.0 or 8x1.25.if ya have the flywheel center made i might have a couple hubs already made.ill send ya pm.

RE: 42cc engines?
 

Nahhh no one here is scared away. If you know someone with a machine shop then by all means talk to him. Problem with doing twins is they are time consuming to set up the machining program. Assuming CNC machines. Next issue is doing cranks as you need to graft two together. Then you need a source for the cylinders and they have to be matched to the case. Fuel system needs to be a reed setup. Homelite had the best and easiest to get for a while. Now that system is out of production and very hard to come by. Try this link to see what I mean. A bunch of us bought these cases from BME.

http://www.rcuniverse.com/forum/m_54...%2Ctwin/tm.htm

RE: 42cc engines?
 

The threaded part of the crank is 1/2" long and has 8 threads on it. Would I have to drill the hub or the flywheel center for the EI magnet? How would I mount the EI sensor, can I use the existing mount that was used for the pickup coil?

Tim, I have read that thread over and over again (I really enjoyed it). I have two of these engines. The only real obstical would be the crankcase, I guess. Taking my two cranks and making one does not seem that it would be that difficult. I might have a hard time coming up with the reeds and cage.

RE: 42cc engines?
 

The crankshaft has 8 x 1.25mm threads. Is there a prop hub made for this thread?

RE: 42cc engines?
 

Prop hubs aren't something you can get off the shelf in most cases. That thread size is very common on the engines I have converted. The real issue is the taper on the crankshaft and the diameter of the crankshaft. I have seen most manufacturers have the same crank diameter but have different tapers on the shaft.

RE: 42cc engines?
 

Tim, I think that when I get the EI sensor mounted I will see how much rotor I need to make sure the magnet will trigger the sensor and then just cut the center out of the stock rotor to achieve the right size rotor to mount the magnet in. Does that sound like it will work?

RE: 42cc engines?
 

Personally I don't like the idea of turning down the flywheel or coring them. Reason being that unless you have a mandrel, which in this case would be a crankshaft with the mating taper you will have a very difficult time truing it. One way you could would be to core it then mount it on the crank of the assembled engine then mount the engine in a rotary table. You would need to indicate the crank in then move over and slowly turn the flywheel to true it with the crankshaft. Make sense? An easier way by far because you don't need as many setups is like I do in the attached photo. You make a prop hub and a timing ring, the timing ring is adjustable 360 degrees so the sensor can mount anywhere. Like anything in machining there are many ways to skin the cat. I tend to look for the simple way as well as the shortest way to the end. Hope this helps.

RE: 42cc engines?
 

If you look at one of my pics above at the rear of the engine, it looks as though I might be able to mount the sensor on the rear of the engine. To many differant possabilities[sm=confused_smile.gif]

RE: 42cc engines?
 

You could mount it there but then you need a new mount or standoffs. You are right in that there are so many possibilities. That is the fun part, the challenge.

RE: 42cc engines?
 

The plug that is in the engine now is a Torch BM6A. Does anyone know if this ignition would work. It is an Rcexl and comes a BMR6A plug 3/4" hex, 3/8" reach and 14mm threads.

RE: 42cc engines?
 

heres a pic of my 24cc echo wich i cut the center out of the flywheel,the large ring at the back of the prop hub wich holds the magnet.then the prop hub is screwed onto the flywheel cut off.Tim is right,i have 2-3 cutoff cranks that i use as mandrels to hold my flywheel sensor.And after looking at my hubs i have an extra one that would fit your threads but you will need a flywheel center to mount it if ya wanted to go with EI.if ya wanted to just use the mag then youd just screw this onto the flywheel as is.your only going to loose about 8oz with EI.ill send ya a PM.the hub i have xtra looks just like the one in the pic.

RE: 42cc engines?
 

The only difference in the plug ir the R means resistor. You want that to cut the RF interference with the EI.