Moderated Discussion Areas
  ContinuousWave: Whaler Repairs/Mods
  Chamfering of Ports on a Rebuild

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   Chamfering of Ports on a Rebuild
Gene in NC posted 04-07-2004 09:38 AM ET (US)   Profile for Gene in NC   Send Email to Gene in NC  
Recall from 2 stroke motorcycle motorcross racing days something about chamfering ports to prevent snagging rings. Could this apply to outboards? Edges of ports on my V4 rebore/rebuild are "sharp" to the touch..

Suspect a broken ring.

TampaTom posted 04-08-2004 10:50 AM ET (US)     Profile for TampaTom  Send Email to TampaTom     
Yes. It wasn't chamfered when it was rebored? Sent you an email with more detail.
Gene in NC posted 04-09-2004 11:54 PM ET (US)     Profile for Gene in NC  Send Email to Gene in NC     
Thanks Tom,

Your email hit the spot. Do you suppose we are the only ones on the board who know about chamfering ports. Of course if the shop does it's work right there is no need to know. However, unlikely that a typical machine shop would know about the chamfer, but would be quite willing to bore.

Have an '87 OMC 90 that has a "VRO" rebuild done by an outboard rebuilding specialist. Think I'll pull a head to see their chamfers.

Guess the engine must be pulled all the way down for the grinding job.

jimh posted 04-10-2004 09:20 AM ET (US)     Profile for jimh  Send Email to jimh     
Gene and Tom,

If you keep exchanging information via email and then talking about your email exchanges, you will be the only two who know what you are talking about.

Gene in NC posted 04-10-2004 12:57 PM ET (US)     Profile for Gene in NC  Send Email to Gene in NC     
This is result of excellent work by TAMPATOM. Subject of email is material from "Two Stroke Tuner's Handbook". Material covers all you need to know about why chamfer needed, how to for the gutsy, and why you need to make sure it is done in your rebore. Couldn't relocate it by search in link.

Tuners are generally real people not copyright lawyers. Old saying from MC days, "If you go to the tuners house and find it looking rundown and beat up with the screen door hanging by one hinge, but the shop in good order, you just might have found a real tuner."

If you are a copyright lawyer you might try the link. Info is in there somewhere.

Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.