SV650.org - SV650 & Gladius 650 Forum



Bikes - Talk & Issues Newsworthy and topical general biking and bike related issues. No crapola!
Need Help: Try Searching before posting

Reply
 
Thread Tools
Old 11-01-22, 09:29 PM   #1
Seeker
Member
Mega Poster
 
Seeker's Avatar
 
Join Date: Jun 2016
Location: NE Lincs
Posts: 1,065
Default Reboring

I've had rebores done before but never seen the process. Over to Allen Millyard and his 4 cylinder 550cc S1 two stroke...

https://www.youtube.com/watch?v=hp66Sx62Aj0
__________________
2016 SV650AL7
2023 GSX-8S
Seeker is offline   Reply With Quote
Old 11-01-22, 10:16 PM   #2
redtrummy
Member
 
Join Date: Jan 2019
Location: N W Leicestershire
Posts: 242
Default Re: Reboring

In awe of the guy
redtrummy is offline   Reply With Quote
Old 11-01-22, 10:35 PM   #3
garynortheast
Member
Mega Poster
 
garynortheast's Avatar
 
Join Date: Mar 2010
Location: Mid Wales
Posts: 2,475
Default Re: Reboring

That was a good watch. We even learned how to make cupcakes!
garynortheast is offline   Reply With Quote
Old 12-01-22, 08:53 PM   #4
Ruffy
Member
 
Ruffy's Avatar
 
Join Date: Aug 2007
Location: nr. Ashby-de-la-Zouch
Posts: 317
Default Re: Reboring

Yes, great insight into the process.

I also like the concept of reuseable copper head gaskets that was part of this.

Now all I need to understand is how to make pistons and valves and I might get somewhere with really restoring my FZ engines!
__________________
Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue.
RIP SV650 X curvy, crashed and written off December 2019.
I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road.
Ruffy is offline   Reply With Quote
Old 12-01-22, 09:01 PM   #5
garynortheast
Member
Mega Poster
 
garynortheast's Avatar
 
Join Date: Mar 2010
Location: Mid Wales
Posts: 2,475
Default Re: Reboring

Quote:
Originally Posted by Ruffy View Post

I also like the concept of reuseable copper head gaskets that was part of this.
I used to make my own copper head gaskets for my T140V 750 Bonnie, to replace the crap composite head gaskets which used to blow between the cylinders.
garynortheast is offline   Reply With Quote
Old 13-01-22, 08:55 PM   #6
Ruffy
Member
 
Ruffy's Avatar
 
Join Date: Aug 2007
Location: nr. Ashby-de-la-Zouch
Posts: 317
Default Re: Reboring

Quote:
Originally Posted by garynortheast View Post
I used to make my own copper head gaskets for my T140V 750 Bonnie, to replace the crap composite head gaskets which used to blow between the cylinders.
Was it just a case of cutting sheet to the right shape and annealing? Did they seal ok at the bore edges?

(I keep reading about needing extra ridges, often loops of wire in grooves, to compress the copper around the bore tops.)
__________________
Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue.
RIP SV650 X curvy, crashed and written off December 2019.
I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road.
Ruffy is offline   Reply With Quote
Old 13-01-22, 09:07 PM   #7
garynortheast
Member
Mega Poster
 
garynortheast's Avatar
 
Join Date: Mar 2010
Location: Mid Wales
Posts: 2,475
Default Re: Reboring

Quote:
Originally Posted by Ruffy View Post
Was it just a case of cutting sheet to the right shape and annealing? Did they seal ok at the bore edges?

(I keep reading about needing extra ridges, often loops of wire in grooves, to compress the copper around the bore tops.)
Yep, I just cut the sheet using a new composite gasket as a template and then annealed it. You could re- anneal and use four or five times before it got too out of shape, then it was time to make a new one. Had no problems with sealing.
garynortheast is offline   Reply With Quote
Old 13-01-22, 09:57 PM   #8
Craig380
Member
Mega Poster
 
Join Date: May 2015
Posts: 1,231
Default Re: Reboring

Quote:
Originally Posted by garynortheast View Post
Had no problems with sealing.
If only Triumph twin pushrod tubes were as easy to seal ....
Craig380 is offline   Reply With Quote
Old 14-01-22, 08:57 PM   #9
Ruffy
Member
 
Ruffy's Avatar
 
Join Date: Aug 2007
Location: nr. Ashby-de-la-Zouch
Posts: 317
Default Re: Reboring

Quote:
Originally Posted by garynortheast View Post
Yep, I just cut the sheet using a new composite gasket as a template and then annealed it. You could re- anneal and use four or five times before it got too out of shape, then it was time to make a new one. Had no problems with sealing.
Good to know. Thanks!

I feel an experiment coming on in the (hopefully) not too distant future. I have an FZ600 engine (aircooled in-line 4) that needs a rebuild and I'd like to get it running for sometime in the summer.
__________________
Spannering the wife's SV650S K5 pointy in Black, and son's SV650 X curvy in Blue.
RIP SV650 X curvy, crashed and written off December 2019.
I'm (procrastinating about) fixing up an old Yamaha FZ600 to get myself fully back on the road.
Ruffy is offline   Reply With Quote
Old 14-01-22, 09:55 PM   #10
garynortheast
Member
Mega Poster
 
garynortheast's Avatar
 
Join Date: Mar 2010
Location: Mid Wales
Posts: 2,475
Default Re: Reboring

Quote:
Originally Posted by Ruffy View Post
keep reading about needing extra ridges, often loops of wire in grooves, to compress the copper around the bore tops.
I'd never thought about that but I can see how it would help. You could always make very thin copper washers to go around each bore, but they would not want to be any more than a few thou thick.
garynortheast is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 09:33 AM.


Powered by vBulletin® - Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.