Chris' 1958 Stroker Motor

Chris had the Chinese (aftermarket) primary chain tensioner that tends to break off and bust the cases.  The (above left) heavy-duty oem type is correct.  It will be out-fitted with a new-old-stock shoe, and retainer.  Genuine Harley-Davidson parts.
H-D Part No. 39978-58 Primary Chain Shoe

6 comments:

david ervin said...

I've seen (and been tempted by) a tensioner that uses a bearing supported toothed roller but I've heard that they are hard on chains as they run on the back side of the chain.

david ervin said...

https://www.google.com/imgres?imgurl=http%3A%2F%2Fi23.photobucket.com%2Falbums%2Fb390%2FToolmaker94%2FSportster%2FDSC03398.jpg&imgrefurl=http%3A%2F%2Fxlforum.net%2Fvbportal%2Fforums%2Fshowthread.php%3Ft%3D510660&docid=lsbAIDrchb7ohM&tbnid=1hm82QHeW00xUM%3A&vet=10ahUKEwjFnI6Xj7rUAhXC4CYKHbvhCP8QMwgrKAgwCA..i&w=640&h=480&bih=617&biw=1315&q=ironhead%20primary%20chain%20tensioner%20racing&ved=0ahUKEwjFnI6Xj7rUAhXC4CYKHbvhCP8QMwgrKAgwCA&iact=mrc&uact=8

Holy crap...All that for one picture? I guess on the internet one picture IS worth a thousand words.

Noot said...

I run the standard tensioner pictured on all engines. Less parts to fall off I suppose? They always work - don't run chain too tight, since the shoe will just wear off and you be back to square one again.

Mct496 said...

Ever try rivets or button head bolts to hold the shoe to the tensioner works good especially on high output stuff

Noot said...

I just saw one like that recently, kinda on top toward the ends. Looks like a good idea. You sure don't want it coming apart.

Mct496 said...

A shoe retainer bouncing around in the primary ain't cool I like the flat side primary chains too the shoe last longer compared to the figure 8 chain