Makita 6421 upgrade

[TMGT]

I've had my Makita 6401 for a while and have been wanting to upgrade to the 79cc P&C for a while.
I started looking for a second saw years ago but nothing was showing up localy for a decent price.

Well, a few months ago a clean 6421 came up for sale locally for a great price so I grabbed it.

After staring at it in the storage shed for way too long, I finally got it on the bench.

It was filthy, and I probably spent more time cleaning than doing the upgrades, cleaned up and new piston installed.

The squish was .028, less than ideal. I was shooting for .018-.020.
The base gasket was .014 so eliminating it all together would have yielded too tight a squish.

I was going to make a gasket from some .010 shim stock, but really didn't feel like making a gasket when I had a nice new one to install.

I ended up putting it on the lathe and turning the mounting flange down. It took a bit to get it aligned/trued.

Ended up with right at .020 which I'm happy with.

 

[dfkrug]

Missed your thread from last summer.

I also picked up a 6421 from a tree company and put a big bore after-market jug on it. I was able to use gasket-delete to get an ideal squish. That saw ran great, and had heaps of power. I sold it, since I already had a mid-size and monster saw that get plenty of use.

In my saw rebuilding I have only found sub- .025" squish on saws made in Japan (Shindaiwa and Tanaka).

 

[TMGT]

I have a couple Makita/Dolmars, really like them, but with Makita killing them off it looks like I'll have orphans before too long unfortunately.

Sent from my SM-S921U using TractorByNet mobile app

 

[RandyT]

I have a couple Makita/Dolmars, really like them, but with Makita killing them off it looks like I'll have orphans before too long unfortunately.

Sent from my SM-S921U using TractorByNet mobile app

The product delete is already in the works. Already running into issues with OEM parts being NLA,