Search results

Very good, thanks Marcus. I put it in both directions beforehand and it seemed to work either way, however the manual stated the arrow should point towards the valves. The engine is for my Blackwidow minibike. Using the original block bored over. Added a billet connecting road and oversized...

Can anyone tell me which direction to install an oversized piston In a Tecumseh HS40 engine? The top of the piston has .010 stamped on the outer edge but no arrow like the stock piston. Wondering if the .010 goes towards the valves or the front the the block?

I picked it up a few months ago and didn’t realize it was an iron bore, until looking at it closely. If the seller knew it, he didn’t advertise it as such. Notice the button magnet attached to the bore. Thanks for all the good info.

Thanks Marcus that’s good info. When you bore the cylinders do you bore .010 over where there is good material left? I found a NOS Tec .010 over piston and rings and was going have it bored for that piston. The original block is aluminum and has formed a ridge at the top of the bore, but I did...

Thanks guys for the replies. I will look for those shims. I saw a Neway cutter for sale but needed to be sure of the correct angle. Marcus, you mentioned resurfacing the existing valves.The intakes will clean up fine I think but the exhaust valve guides are pretty worn resulting in a good bit of...

I am fairly new to the forum. As owner of a few old Rupps, I am seeking some information on a couple of items. 1. In my old Tecumseh manual the specs say the valve seat angle on the hs40 is 45 degrees. However, a diagram on different page shows a 46 degree seat angle. Which is the correct angle...