Topic: 78 750F Pitson Rings

[niclpnut]

Hi,

Firstly, great site.  I've owned Suzuki's for several years and am a member over at GSresources, and active in our local VJM club.

However, after helping a friend bring a 74 cb750k back to life, I recently acquired a pretty nice 78 supersport, and am currently elbows deep in a top end freshen up.



I've got the head into the shop to have the seats recut, and check the guides, honed the cylinders, and decarboned/degreased the pistons and everything else.

I've read through pretty much every archive about the 750F ring situation, and realize finding a set of 13011-410-601 is not going to happen.

However, after reading about wohali's difficulties and having custom rings made, my question is weather or not the earlier Rings (part# 13011-392-004) will work for my application.

After reviewing both parts fisches on the 77 and 78 supersports...both utilize the same piston #13101-410-003 throughout the model years.

Early model 77's used the #13011-392-004 rings and later model 77-78's used the 13011-410-601.


Soooooo, that being said, has anyone used the 13011-392-004 rings from davidsilversprares or elsewhere in their F3 bikes and 410 pistons with good results?   


I know having the ring grooves resized is an option, but if I can save on machinist labor, it would be worth the inquiry
Regards,

Nic

[niclpnut]

Just a quick bump,

Happy thanksgiving!

Nic

[mrrch]

I'll check tomorrow at work. I seem to remember that the 392 update to the 410's.

[mrrch]

http://forums.sohc4.net/index.php?topic=57528.0

This may help.

[niclpnut]

Ok so the ring gaps for the 410 pistons are ~1.31,1.22 and 2.81.

The 392 rings are 1.1, 1.1 and 2.8mm thick,  so I guess they should work...unless of course the 410 first and second rings were thicker and fit the gaps better.

I had read the post before but wanted to be sure the 392 rings would work, as ppl have had to resize ring gaps for earlier K model rings, and some have had custom rings made...

 The 392 rings are still readily available unlike te 410 rings.

Nic

[mrrch]

I was off slightly, the 405 rings update to the 392's.

[jtb]

I used the 392's last year in my 77F.  No issues.

[niclpnut]

Did your 77 have the 410 pistons with the full dome top?

Nic