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Old 08-09-2010, 10:03 AM
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Al.Fisherman Al.Fisherman is offline
Motorized Bicycle Elite Member
Join Date: Sep 2009
Location: Calera, Alabama
Posts: 1,966
Default Re: I need your guys' 2 cents on durability/ longevity issues on HT motors and.....

I'm not going to read through all the replies, so this is my $0.02

..making them last!

So just as I thought I was out of the woods in regards to working every technical issue on getting my second build to run, I got her going and the one of the studs used to mount the back of the motor to the seat post tube on the bike cracked in the block. After working diligently for an entire day to get her to this point and having that happen, somebody give me a "bro hug" and tell me things will be okay.

When mounting a engine ..mount it to the frame and not the frame to the engine. This is the most common mistake and causes both front and rear mounts/studs to break.

Replacing the studs was always on the back of my mind but, just never got around to it. Boy do I regret that.

SO......I'm planning on just getting a new base, cyclinder, and piston rings. I'm gonna port and polish it myself because well, it sucks riding a motor without the preparation of porting.

MY QUESTION IS: Even if I am to replace the studs, with stainless steel ones, lock tight the crap out of them,and order all new gaskets WHAT OTHER THINGS CAN I DO FOR MY MOTOR to ensure that I'm not working on my ride EVERYDAY and ensure that it lives a LONG happy life? Are there any other concerns that I should address as well? (ie. things to consider about the crankshaft and flywheel etc.) BTW, I also have the SBP expansion chamber and am planning on picking up their shift kit.

Use Grade 8.8 studs (close to US grade 5) NOT stainless. Anything over a grade 8.8 is overkill because the cast aluminum can't take the torque that the 8.8 stud can. 8mm studs torque to between 150 and 204 INCH pounds, the 6mm studs torque to between 50 and 65 INCH pounds. I use 150 and 50. Have NEVER had a broken stud/mount or pulled thread. I use red lock tite on all cylinder/mount and both intake/exhaust studs. Double nut ALL studs. I use a standard nut followed by a nylon locking nut on everything besides the head nuts. 50 inch pounds may not be enough to keep the engine from twisting on the tubes so I make a small anti torque bracket.

I really want this rebuild to go flawless so all your collective expertise is very much appreciated. At the same time, I hope your answers will help other readers and lurkers build the most efficiant bike possible so that they don't encounter the pitfalls I have.
Looking for HT's parts?
HT pre instillation tips.
Engine running problems?
HT breakdown Photos

Ron ><)))))*> Calera, Alabama

Last edited by Al.Fisherman; 08-09-2010 at 11:32 AM.
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