What's on your bench today?

[billpierce]

Decided to get my finger out of my bum and strip my husky 371 down to rebuild. It's had fairly low compression but ran ok.
 
I'm going to change the crank seals as I imagine they'll be fairly hard after years of use, replace all the rubbers and put another exhaust on it as the original is pretty dented and rusty. The cylinder has a few vertical marks by the inlet and exhaust ports but I can't feel them with a fingernail, so I assume they are just normal wear marks from millions of passes from the piston.
 
I'm getting the carb cleaned and will fit a seal kit to it, I'll get the cylinder honed and have ordered a piston ring, the piston appears to be ok. I'll check the squish and probably delete the base gasket if I can, and polish the exhaust port.
 
There is a lot of carbon build up on the piston, the top of the cylinder and the exhaust port, how do people remove this? Seems pretty well baked on. 
 
Can the piston circlips be reused, or if I remove the piston, should they be replaced?

What does the exhaust side of the piston look like?

[Toad]

I'll try to grab a photo in the next couple of days. Don't think there were any obvious issues when I looked.

[billpierce]

I'll try to grab a photo in the next couple of days. Don't think there were any obvious issues when I looked.

Does look a tiny bit like small about of transfer on piston. Though v hard to tell from pics. If there is I'd prolly replace the piston as if your doing the rings for compression sake. Pot should clean up good.

[Toad]

7 hours ago, billpierce said:

Does look a tiny bit like small about of transfer on piston. Though v hard to tell from pics. If there is I'd prolly replace the piston as if your doing the rings for compression sake. Pot should clean up good.
 

Think don't think there is transfer on the exhaust side. The piston seems smooth there, although there are still some faint marks. The inlet side is a little worse with a couple of scratches you can just feel, I assume this is from poor filtration in the past?

[Ratman]

Concrete saw gone tits!!! Clunky dunky on pull start... suspect crank knackered.


Suspicions confirmed, big end worn and con rod wonky donkey!!! Time for a full rebuild kit me thinks.

[Conor Wright]

17 minutes ago, Ratman said:

Concrete saw gone tits!!! Clunky dunky on pull start... suspect crank knackered.


Suspicions confirmed, big end worn and con rod wonky donkey!!! Time for a full rebuild kit me thinks.

Scrap it and get a gs461! Looks far more menacing!

[Ratman]

Scrap it and get a gs461! Looks far more menacing!

Agreed, they do look the nuts!
But its not mine, its a mates, he generally looks after his stuff, saws clean all round but cranks shat itself, just one of those things. I’ll leave it up to him what i do, just crank and bearings or if he wants to re pot it too, i’m not fussed. I like the 400’s over later models personally.

[Conor Wright]

8 minutes ago, Ratman said:

Agreed, they do look the nuts!
But its not mine, its a mates, he generally looks after his stuff, saws clean all round but cranks shat itself, just one of those things. I’ll leave it up to him what i do, just crank and bearings or if he wants to re pot it too, i’m not fussed. I like the 400’s over later models personally.

Any indication as to the cause? Had to buy a new consaw a few years ago when the old one finally packed it in, would have liked a chainsaw type but went for the wheel because;

a, they had one in stock and I needed it on the day and

B, it was half the price (and probably far more practical, ergonomic and sensible overall)

Ended up with a ts400. Decent machine. Easily started even when left lying for a while. But the 461 cut off saw still calls me! 

 

[Ratman]

Nothing obvious at all, just a lot of bag in the con rod / big end, quite a bit of up and down movement and you can also feel excessive wear when twisting left to right too. Cylinder and piston are good, if it was mine for what work it’ll do i’d just replace crank, bearings and seals.

[billpierce]

Think don't think there is transfer on the exhaust side. The piston seems smooth there, although there are still some faint marks. The inlet side is a little worse with a couple of scratches you can just feel, I assume this is from poor filtration in the past?

Aye doesnt look to bad at all. Happy days