SOHC.co.uk Forums > CB750
Taking engine out burning oil
Tomb:
I had similar experience but the opposite way round, I had a Triumph Daytona (cast iron block) bored to fit new high compression Hepolite pistons, the borer did Jap bike tolerance of two thou when I'd asked for 5 thou, the engine seized!!.
A good borer will ask what clearance you want, the last bore job I had done was by Lancaster Engines, brilliant old school engineers.
http://www.lancasterengines.co.uk/classic-car-vintage-engine-reconditioning-services-in-lancaster/
royhall:
--- Quote from: Tomb on March 28, 2017, 08:21:34 AM ---I had similar experience but the opposite way round, I had a Triumph Daytona (cast iron block) bored to fit new high compression Hepolite pistons, the borer did Jap bike tolerance of two thou when I'd asked for 5 thou, the engine seized!!.
A good borer will ask what clearance you want, the last bore job I had done was by Lancaster Engines, brilliant old school engineers.
http://www.lancasterengines.co.uk/classic-car-vintage-engine-reconditioning-services-in-lancaster/
--- End quote ---
I assume these guys are not the ones responsible for the seizure.
Tomb:
--- Quote from: Tomb on March 28, 2017, 08:21:34 AM ---Lancaster Engines, brilliant old school engineers.
--- End quote ---
Lancaster Engines are superb, no I have no connection to them before anyone asks. ;D They were extremely helpful when trying find oversize liners for my CB72/CL77 project racer.
I was a Toolmaker for 18 years and now a Mech Tech at a well known Pharmaceutical site for 18 years so appreciate proper engineers, which they are. The tight bore was done by a local motorcycle shop, in fairness it was an Ok job and probably would have worked well on a Jap engine but was not what I asked for. The Triumph engine nipped up within the first 1/2 mile of very gentle running, stripped and honed more by me and ran very gently for a long run in period, never nipping again.
royhall:
Thanks Tomb will give them a go. Quite handy really as I am only in Thornton-Cleveleys. Will pick a nice day and have a run over on the bike. Cheers.
Greebo:
--- Quote from: yozzer74 on March 21, 2017, 03:50:18 PM ---I'm in contact with Steve he's helping me out with things on engine cheers
--- End quote ---
Yozzer
I was over at Steve's place yesterday he said you had called a couple of times to asking for his help & advice, from what you told him about the work you had done, his thoughts were those who had done the rebore could have took too much out of the barrels, so he offered to try & get you a set of Barrels, which are hard to find, but he has now got a set, he spent some time sourcing them for you, but he tells me you have not been in touch since.
it made me feel a bit awkward because I put you in touch with him.
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