10 Degrees F, Cold start, 3 sec. warm-up, 5 sec. WOT, then no compression....

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zzr7ky

zzr7ky

Minister of Fire
Jun 12, 2006
1,053
Hi -

Life and learn.

Makita 6401 that never gives trouble...

After weeks of use in the cold. First start of the day. 10 Degrees F, Cold start, 3 sec. warm-up, 5 sec. WOT, then no compression....

No unusual sound, just no compression. Immediate drop it you suspend it by the pull-cord. :(

So... I start at AS bourd figuring it may be time for bigger Piston and Cyl, to bump it up to 79cc for about 20% more HP. AS folks suggestions: Clean and diagnos, then order part ;)

Diasnosis confirms no compression caused by Spark Plug that was laying loose in the cover! ;em

So saw is clean and back in action!:cool:

However now I have the hots for a 6401 -> 7900 Saw build... ;) A case of latent CAD out of remission

I think the lesson learned is to check the saws over when sharpening in the cold weather just like I do when it's hot. I just wasn't doing anything beyond sharpening, and filling the tanks in the cold. Filter was pretty rough also.

Be safe,
Mike
 
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Saw your post and solution on AS - always worth checking the simple solutions first and glad you were able to solve the issue with a simple fix. No issue with the spark plug threads on the cylinder? I've wanted a 7900 for a long time - but, if I were you I'd run the snot out of the 6401 - nice saw. Cheers!
 
zzr7ky said:
... First start of the day. 10 Degrees F, Cold start, 3 sec. warm-up, 5 sec. WOT, then no compression....
Click to expand...

WOW! that seems brutal...surprised that is not the cause of all sorts of bad things right there. I usually let my husky burble around at idle for 20-30 seconds before a few light pulls of the trigger, then some light cutting just to get everything up to temp.

...but, i guess if you get away with it...
 
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Corey said:
WOW! that seems brutal...surprised that is not the cause of all sorts of bad things right there. I usually let my husky burble around at idle for 20-30 seconds before a few light pulls of the trigger, then some light cutting just to get everything up to temp.

...but, i guess if you get away with it...
Click to expand...

Ya you ain't kidding. 2 Strokes do not like to run cold often times it ends in seizure.
 
Corey said:
WOW! that seems brutal...surprised that is not the cause of all sorts of bad things right there. I usually let my husky burble around at idle for 20-30 seconds before a few light pulls of the trigger, then some light cutting just to get everything up to temp.

...but, i guess if you get away with it...
Click to expand...

I think if you read between the lines, he wants a 7900 ;lol

The extra hp does put a smile on my face. I've been hoping to blow up my 6401, but I'm afraid it's gonna be awhile. I keep a 28" bar on my 7900, so I need a second 79cc saw to run a 20" with an 8 pin ;) I can't justify the cost to fix something that ain't broke.
 
Yes to all the above.

I'm definately warming up equipment in the future!

I have my eyes peeled for another 6401 or 6421 for upfitting! Heck it's keepin' a smile of Jeff's face so it's gotta be good ;)

Mike
 
Get yer head back out of the clouds and cut some wood ! ! !
 
Bill's statement is appropriate ;).

It's not as easy doing the maintenence in the cold but waiting around doesn't get it done. I've sold a good bit of wood this year to folks who were caught short. Pretty much just to keep good customers that are close by and easy to deal with. I am not able to haul wood out much this year due to snow. I have a lot of hauling to do and still need to get wood down and bucked.

Saws are getting a nice warm up from now on!
 
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