H25 Tecumseh 1969 birthday boy

Mini Bike & Go-Kart Parts

markus

Well-Known Member
#1
1969 H25, this True mini bike from the factory version engine turns 52 in a few days on November 7th. Took alot of internal parts and a very expensive hard to find muffler to get it back in shape but came out really nice. $800 plus the ride.

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Full build pics/info and even a run video are already posted in the Tecumseh section in this link: 1969 h25 rebuild

Steel sleeve block, bored .010 over (new piston/rings/pin of course) new con rod and replaced crankshaft,
Governor shaft replaced and block was modified and bushing installed to correct wear.
4 angle valve seat cut, oversize intake valve (stainless) installed, new exhaust valve as well. Compression relief port filled and no compression bump on camshaft valve lash set to minimum clearances.
Port deburring/transitioning, with modified/opened up exhaust elbow and good match port on intake.
All mating surfaces trued, Head shaved .015 in the process.
Original carburetor, rebuilt with OEM parts, including a new throttle shaft, etc..
Ignition fully redone, with OEM points/con/and factory Tecumseh plug.
recoil disassembled and serviced new rope installed etc..
NOS correct muffler and NOS correct fuel cap, new fuel line, air filter, seals and gaskets.
All hardware, is correct and original everywhere on the engine except for exhaust locknut (had to use a thin Clinton version nut due to modifications to the elbow)
Painted factory style in single stage automotive urethane, waterslide decaling and repro Tecumseh hang tag.
 

markus

Well-Known Member
#3
What brand and color single stage automotive urethane did you use and what is the heat rating?
I use Nason Fulthane which is a product of Axalta. No idea of heat rating. It’s a color I have the paint supply shop I work with mix for me custom. Thanks for your interest
 

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