I am getting ready to scratch build a high wing slow flyer, styled after an ultralite.
I'm looking for an engine for this project then I'll build the plane to fit the engine.

I am hopeing for at least a 12 foot wing spand and would like to run a gear reduction system to turn a big prop.

I am following a couple of auctions on **** for the 100cc Yamaha Kart engines. Does anyone have experence with one of these babys? They seem to have everything going for them.

I am very impressed with the knowldge and perserverence of this group.

And I have just purchased a used Echo back pack blower.

Keep up the goooood work.


........... Ralph...........

avoid the 100 cc yamaha engine, it is pretty big and rather heavy. Had one and sent it to a cart guy.

Have you run this engine enough to determine if you have adequate cooling? If so what diameter did you cut the fins down to. After reading this thread I went to my saw shop and picked up two 031s for $20 each and am going to build them up. With a little port work I am sure you can beat the power numbers of the big boys.

Mark

Why some guys always try to reduce everything to money???

Why they care about the $$ per hour of labour, when almost all the converters do the conversion for fun, as a personal challenge.

If we really consider the time inverted, the few $$ that cost the trashy engine and some aluminum and all the pain to make it run propperly, for sure we all will buy a ZDZ, BME or a DA, but then...why there are so much guys converting engines...because we like it, and it is relaxing and fun for us...and that has no price.

tato lazo

Well done Tato!!

bn120 had: BME 50 3.3 lbs, DA 50 3.0 lbs. My stihl 51cc conversion 2.8 lbs

bn120: What engine parts did you lighten? Crankshaft webs? Piston? Cooling fins? Cylinder webs and bosses?
What tools did you use to do the lightening?
How much weight did you grind off? Weight before - weight after?
What weight (the 2.8 lbs) did you measure? Was it just the cylinder + piston + rod + crank + crankcase + bearings + prop driver + prop washer + prop bolt + carburetor + carburetor adapter?

My research shows the following weights in grams and decimal pounds:

spark-plug 041 0.09
muffler 200 0.44
mount 120 0.26
battery 150 0.33
E.Ign. 150 0.33
TOTAL 661g 1.47lbs

Notice 1.47 lbs is a significant payload that the engine has to include.