Erico Posted September 27, 2020 Share Posted September 27, 2020 Can I replace the 2 front cylinder sleeves only? Link to comment Share on other sites More sharing options...
Member Contributer jefferson Posted September 27, 2020 Member Contributer Share Posted September 27, 2020 It can be done. I don't know for sure, but the stock sleeves are probably integral with the block. They would need to be bored out and new sleeves pressed in. How bad are yours? Maybe a big bore kit would clean them up. Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted September 27, 2020 Member Contributer Share Posted September 27, 2020 A used engine would provide satisfactory service and be a far easier / faster proposition than a rebuild. Link to comment Share on other sites More sharing options...
Member Contributer DannoXYZ Posted September 28, 2020 Member Contributer Share Posted September 28, 2020 Yeah unless you had plans for big-bore high-compression upgrade (why do stock rebuild?), much simpler, faster and cheaper to get used engine. Link to comment Share on other sites More sharing options...
Erico Posted September 28, 2020 Author Share Posted September 28, 2020 Hi, no 4 piston sleeve is not so great, one guy said just hone it? But are they nikasil plated? And is it possible to just hone the sleeve.... TX so far for the info. Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted September 28, 2020 Member Contributer Share Posted September 28, 2020 Depending on the amount of damage and where it is honing is a viable solution ...any photos? Ive had really badly damaged bores welded and rebored by Abtec, they’re pricey, you don’t get through the door for less than £200 Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted September 28, 2020 Member Contributer Share Posted September 28, 2020 4 hours ago, Erico said: Hi, no 4 piston sleeve is not so great, one guy said just hone it? But are they nikasil plated? And is it possible to just hone the sleeve.... TX so far for the info. IIRC all the 750's have iron cylinders & Honda do list over size pistons. So it is possible to overbore or hone to next oversize. Downside is the integrated cylinders mean you have to strip the whole engine to do the work. Replacement engine would be most cost effective unless you can do the spannering & as its in bits do a full refurb job. YMMV Link to comment Share on other sites More sharing options...
Member Contributer JZH Posted September 29, 2020 Member Contributer Share Posted September 29, 2020 Just find a lump and swap it in. Rebuilding a VFR motor would cost more than the bike's worth! Anyway, you pretty much can't sell a VFR motor as they rarely go bang, so if you do find one it can be cheap as chips. Too bad you're not near me--I've got a lump with one snapped camshaft. Just takes up space... Ciao, JZH Link to comment Share on other sites More sharing options...
Erico Posted September 30, 2020 Author Share Posted September 30, 2020 Thanks for all the help, going to remove the engine this weekend, and remove the front two pistons and I will take photos. Link to comment Share on other sites More sharing options...
Erico Posted October 1, 2020 Author Share Posted October 1, 2020 Hope this photo gives an idea of what damage I have. Link to comment Share on other sites More sharing options...
Member Contributer Cogswell Posted October 1, 2020 Member Contributer Share Posted October 1, 2020 What caused the damage, and why weren't all 4 affected? Link to comment Share on other sites More sharing options...
Erico Posted October 1, 2020 Author Share Posted October 1, 2020 I have no idea what caused this. The other sleeves are all good. One mechanic suggested that we go ahead and hone this sleeve and replace rings. So the idea is to do both cylinders. Hopefully the engine will be out by the end of the weekend. Link to comment Share on other sites More sharing options...
Member Contributer Thumbs Posted October 1, 2020 Member Contributer Share Posted October 1, 2020 That’s #4 cylinder, mice pee has done that where at some point the bikes been stood up, the lines correspond to the ring positions as the piss ran down Check the air filter and if there’s a nest you need to pull the carbs off and check #4 works and clean the debris out I had a nest in my project RC24 that had corroded the throttle spindle and it was locked solid Your advice is good a hone and new rings would be a quick fix Link to comment Share on other sites More sharing options...
Erico Posted October 3, 2020 Author Share Posted October 3, 2020 Thanks for the info, going to replace both front pistons. Hope all turns out well. Link to comment Share on other sites More sharing options...
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