OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Chainsaws and Concrete Cutters Petrol Chainsaws and Concrete Cutters Partner 400 - a bit sad

Picked up a Partner 400 (not going) at an auction the other day for $15. Probably not worth it, in hindsight, but I've bought some surprisingly good equipment that way (still using a 009, and an S10 that I got for $5 and $22 respectively), so I figured it was worth the punt.

Got it home and after removing the muffler, found that the piston looks a bit like the Bruce Highway - rough as guts!

My guess is it's suffered the age old problem for two-strokes - straight petrol

Does anyone know of a source for piston, rings & (probably) barrel? I'm hoping the crank/conrod has survived, but might need them too.

Just for the barrel, piston and rings you are probably looking at $250+, there is a second hand piston and cylinder on ebay at the moment for $50. You would easily get your money back plus some from selling it as faulty on ebay.

If it is a plain cast iron cylinder liner, you may be able to recover the cylinder by honing - you can find out just by inspecting it. The problem isn't the aluminium that has stuck to the bore, it is the scrapes and scratches, and those may be quite shallow. If they are shallow you can use a standard piston, which is likely to be more easily available than an oversize one. If it didn't get to the point of seizing, I'd guess you have a good chance of just needing a piston. Even the original rings may be recoverable. Are there other engines that use the same piston? If there are, you have a better chance of getting a second-hand one.

With most chainsaws I have had they are a chrome plated alloy bore, running them without oil rips the chrome apart and the cylinder is trash. Just wehat I have found in the past though.

Joe, I agree you can't recover a chromed bore if it has been damaged. I'm not up to date on what is being used now, but way back some had cast iron bores (cast-in cylinder liners), some had metal-sprayed bores, a few had chromed bores, and el cheapo ones had aluminium bores. All except the chromed ones can be honed.

According to the acresinternet site, they were chrome-plated aluminium bore. The damage to the piston & rings visible through the exhaust port, I'd say the cylinder is shot.
Those parts Joe saw on the net are from Canada - near enough to $200 inc. freight at their current price
Might stick it on Fleabay and see how it goes.
Thanks guys

Thanks for the update, igor. I'll close this thread.