JimD 3,345 #1 Posted May 2, 2010 Hi guys, I have a couple friends needing help with an HH 100 Tecumseh. This engine is on a Raider 10, about a 68 model we think. I don't have the numbers, (long story). Jerry is a machinist i used to work with, and he has checked this engine out and determined that it will need over sized valves . Does anyone here have a source for these? It was already bored to .010 over at some point, and they are thinking about boring it again to .020 over, but the problem is the the valve guides are not replaceable, so they will need over sized valves. Any and all replies welcome! Thanks. Share this post Link to post Share on other sites
MikesRJ 552 #2 Posted May 2, 2010 ... it will need over sized valves ... You mean over-sized piston don't you? Valve guides can be replaced, seats re-cut or replaced, and valves replaced. Bores can be cut over-sized and +.010/20/30 pistons and rings installed, or even crank journals cut down .010/20 and matching under-sized connecting rod installed. But never an over sized valve outside of racing engines. EDIT: You changed your post while I was lambasting you ... tsk, tsk. I don;t know much about Teckies but can't the existing guides be bored out and custom cut guides installed? Share this post Link to post Share on other sites
linen beige 14 #3 Posted May 2, 2010 ... it will need over sized valves ...But never an over sized valve outside of racing engines. I don;t know much about Teckies but can't the existing guides be bored out and custom cut guides installed? I believe he means valves with oversized STEMS. Ie. http://www.cpdonline.com/692509.pdf These are covered about mid point of page 90. Share this post Link to post Share on other sites
JimD 3,345 #4 Posted May 2, 2010 Linen is correct, I was talking about over sized stems. The way Jerry explained it to me was that the seats are part of the casting and can be reamed out to the next size stem, which would be 11/32. Mike, I didn't change my post, if you look you won't see any editing there, but yu can lambaste me anyway... :D Share this post Link to post Share on other sites
JimD 3,345 #5 Posted May 2, 2010 So nobody knows where ya can buy the oversize stem valves? :D Share this post Link to post Share on other sites
MikesRJ 552 #6 Posted May 3, 2010 Links sent, as I sheepishly stand corrected. Share this post Link to post Share on other sites
JimD 3,345 #7 Posted May 3, 2010 Thanks much Mike. :D Share this post Link to post Share on other sites
