Recent content by bobco

Mike Sandberg is a well-known Tecumseh kart engine builder in Aurora, Colorado. Super nice guy and an amazing machinist. Together we came up with the Super7, a bored and stroked 299cc H70. Bore 2.8135", stroke 2.932"

I've got mine on eBay for $599.00 and no one wants it!! I'll probably pull the billet rod out of out and scrap the rest! I was really surprised one that was beat to shit with NO flywheel sold for $800 last month...

Interested in this!

That's a neat idea, but you may get better flow by removing the metal in each intake and exhaust port to improve flow, by blending out the sharp right angle blobs from the factory castings. This and some camshaft work really wake these HS50s up!

I have one available! Tecumseh Rupp Fox MTD HS40 4 HP 33080 Crankshaft Roadster2 Black Widow Minibike | eBay

Wow! Now if we could get these boys to reproduce the 1969 Rupp Roadster tanks! :)

Bike is SOLD!

Excellent! I am glad those parts arrived safely! I should have included some bronze 1/4" valve guides I bought years ago from Mike at VKE. :)

Here is a well preserved and un-molested 1972 Rupp Roadster2 with a strong smooth running HS40! Comes with the optional VDO speedometer kit as shown with 203 miles and the rear luggage rack. Everything works on the bike, hi and low on the headlight and the taillight works too. Original Rupp...

OK, my build used a H50 Motorsports block with steel sleeve, a stock H50 cast aluminum connecting rod, and a H60 crankshaft, and the .020" over Wiseco HS40 piston. With the difference in compression height of 1.150" for the H50 piston and 1.050" for the HS40 piston, this combination of parts put...

I'll look at my notes of my build tomorrow and see if I mentioned anything about piston pop-up. I do recall using a .040" copper head gasket on this one. My H50 block with steel sleeve did not have any trenching done do it, or was it cast like that. I have seen both versions of the blocks in the...

:)

I built a Motorsports H50 block with a stock H60 rod and a bronze spacer for the wrist pin, the Wiseco HS40 .020" forged piston and saved 15g on the reciprocating weight. And the engine runs smoother! This billet rod is a cool find, congrats!

Bike is SOLD! Thank You Matt!

Here is a well preserved and non-molested 1972 Rupp Roadster2 with all original documentation including dealer sales receipt, engine warranty card, owner's manual, a very rare Rupp cycle warranty card and all other documentation as pictured, you rarely see any of this with a bike sale these...