julestoo

I'm still trying to get detailed info on stripping a Homelite 25cc. I think I can do the rest, but I am still not sure how the flywheel fits to the crankpin. It has no retaining bolt. Is it just located on a taper and u pull it off using a 2 or 3 jaw puller? Or what??
All help welcome!
Next issue! Can u cut down the flywheel drastically, to say 60mm dia, replace the magnet and bring the ignition pickup as close as it was before? Obviously timing must be preserved but all that needs is an appropriate bracket from the original location, not so?

av8tor1977

My Feedback: (6)

I usually just wedge two screwdrivers behind the flywheel, somewhat forcing it in the direction to remove. Then screw the flywheel nut on until it is flush with the end of the shaft threads. Then a sharp rap with a hammer and the flywheel will pop right off.

A two or three jawed puller can also be used.

Other than removing the fins and rebalancing the flywheel, modifications are NOT recommended. The centrifigal forces at the rpms these engines turn are incredible, and you could easily create a "ticking bomb" with a modified flywheel.

AV8TOR

julestoo

Thanks av8tor. I see pictures of Zenoahs with almost no flywheel,for use in planes. Is that because the Zenoah crank is supported in bearings at both ends and the crank is balanced (as far as u can balance a single cylinder) without a flywheel?

av8tor1977

My Feedback: (6)

True, but those are factory made flywheels, and not something a person could safely come up with in a home shop. (It has nothing to do with the bearings.) If weight is a problem for you, I suggest converting to battery CD ignition to get rid of the flywheel, or look into Gas/Glow operation.

Here's a ton of info on "Gas/Glow": http://www.rcuniverse.com/forum/m_12...page_50/tm.htm

Here's a link for ignition systems: www.ch-ignitions.com

Besides less weight, both of those options will also give you slightly more power, and easier starting.

Good luck,
AV8TOR

platero

take a look to my work in a Hom 25 is in spanish but pictures can help you http://www.hpignitions.com.ar/reform...lite_25_cc.htm

captinjohn

Too loosen flywheels....support back side of flywheel. Make sure the nut that holds the flywheel on , is loose and flush with end of crankshaft. Just tap on end of crankshaft with hammer...its loose!!!! Capt,n