Hitchcocks Forum

I just found this lot in my '94 500 Bullet!the bike has a new piston and barrel fitted by the previous owner and has been running fine since I bought it 2 months ago. Luckily I decided to rebuild it to use in my trials bike project.

Looks like the previous owner failed to remove all traces of the previous piston.
Make sure there's nothing blocking that scavenge oil-way or any other oil way for that matter and that the oil pump faces and bodies are still good.

Oh dear. Lumps of piston skirt? They off the one that was in it or from a previous mishap? Check inside your rocker blocks for aluminium swarf, it seems to lodge there (I noticed this following a stripdown on one that had eaten its big end).



I had a similar experience on one I bought recently but with a piece each off two different piston rings instead. Neither piece being from the ones that were in it. Mind you, I was supicious of nonsense like that because the previous owner had also attached the chainguard to the frame and the mudguard to the swingarm.

its from a previous mishap. there was some v fine specs in the rockers and Im sure the pump has been affected too. I knew it was too good to be true when it started first kick after sitting in the blokes shed for 2 years.

Hi GUys----------Hi Martyn s and "well done" for having the (4/3 pi r cubed x 2 )'s to strip it and to show us the results....I hope your re-built trials engine gives you many miles / hours / stone gulleys / peat bogs /up the pipe line etc... of fun in the years to come !!.

This next is just for fun really but it might make you feel a teeny bit happier}----- For my last 18 years before early retirement I was employed at the MoD's Armoured Vehicle Refurbishment Workshops here in Telford, Shropshire.........and for a time on the Rolls Royce CV12 Diesel Engine programme.......These are the ones that power the Challenger Mk2 MBT ( Main Battle Tank )....On the earlier versions the main engine lube oil pump was driven by reduction gearing in the form of a Triplex chain !!....It sat at the bottom of the sump...........Occasionally a roller or two would break up and before you could say "oops a daisy" they had been pumped around the crank, main oil circuits and cylinder heads ( 4 of those !!)!!..........Result = 1 totally scrap engine............OR}----After some 150 hours of skilled re-build by 2 of our Technicians an engine would go onto the test bed for a predetermined test load cycling......and every now and then you'd hear a "BOOOOOOOOOOOOOM!!" followed by a "Groan" from the refurb. Manager as one of the 16 con rods decides to take a step outside for a breath of fresh air !!......Result = 1 totally scrap engine...........War ain't cheap and we hadn't even put the engine into its recipient vehicle yet !! ..................................

TYPO !!!------------It should read}----"one of the 12 con rods" ......... The clue is in the designation title of CV12