Mitox 4116 (OK I know your laughing)

[cygnusnsf]

Thats the Badger! Here are some photos with muffler off... Piston looks nasty

[bmp01]

Well bugger me, just had a play and its actually not all bad.

Walbro carb with purge bulb, 160 psi compression cold and some nutter has fitted a new plug and done a muffler mod on it (must remember to value my time better).

I dumped the fuel, added some fresh, purged it though and it popped on the first pull. Choke in and it started next pull. Compression was still 150 psi hot, (must have had a new ring surely?)

Ok so the AV system let's the vibration through and its probably not got the power of a decent saw but not all bad. 

 

 

Edited May 29, 2020 by bmp01
New ring note...

[cygnusnsf]

Sounds like a good saw!

[bmp01]

Yeah,  that's not too good. But also not a complete disaster, as these things go it's a light seize. Really depends how you value your time whether you fix it or bin it.

In my opinion there's a very good chance the cylinder will clean up, new piston and ring assembly required if you want to do it right.

The engine is not a clamshell  design so pretty easy to get the cylinder off.

As stated by Spud, you need to think about why its done that in the first place, otherwise it will repeat itself. Could be bad fuel,  could be fuel lines or carb.  Could also be crankcase seals.  You might want to do a bit of research to see what you're up against.

 

HTH.

 

 

 

 

[bmp01]

Good pictures by the way ?

[cygnusnsf]

OK Cool as I really just want to use as learning exercise I guess a few quid and some time not an awful idea. I think I'll get the cylinder off see if thats badly scored and if I clean it up see if a new piston and ring will do the trick.

[cygnusnsf]

Any tips for cleaning - seen things like oven cleaner which would be fairly cheap.

[bmp01]

6 minutes ago, cygnusnsf said:

Any tips for cleaning - seen things like oven cleaner which would be fairly cheap.

2 routes:

Chemical- disolve aluminium deposits,

Abrasion - brake hone / emery cloth on a mandrel or a flappy wheel

I don't know that there is any evidence says one is better than the other. For a light seize where there is only a small amount of aluminium to remove I guess dissolving it won't take too long.  But check for deep scores in the cylinder, you don't want chemicals to attack the aluminium cylinder under the plating.

 

Personally I quite like the emery on a mandrel but then making up the mandrel is small beer as I have a lathe. See pic. 

I've used the old blue Harpic (bog cleaner), bubbles nicely on ally, I've used that in the past and seems ok - don't know if that's frowned upon ?

 

 

[Ratman]

2 routes:
Chemical- disolve aluminium deposits,
Abrasion - brake hone / emery cloth on a mandrel or a flappy wheel
I don't know that there is any evidence says one is better than the other. For a light seize where there is only a small amount of aluminium to remove I guess dissolving it won't take too long.  But check for deep scores in the cylinder, you don't want chemicals to attack the aluminium cylinder under the plating.
 
Personally I quite like the emery on a mandrel but then making up the mandrel is small beer as I have a lathe. See pic. 
I've used the old blue Harpic (bog cleaner), bubbles nicely on ally, I've used that in the past and seems ok - don't know if that's frowned upon ?
 
 

[emoji33][emoji33][emoji33] oooohh bmp01 you animal you! ??

[spudulike]

17 hours ago, AngrySquirrel said:

Ever heard of Mary Black? Babes in the Woods etc

Nope, sorry, Rush was a throwback from College days, hanging with the hippies!