Jonsereds 630 Piston upgrade on a Husqvarna 261

DHansen · May 26, 2022, 11:54:33 PM

Can I put a 630 Jonsereds 48mm piston into a 261 Husqvarna.

My first choice of piston was a 262XP for this 261. I have not been able to locate 262XP piston (new) OEM.

But was able to locate NOS 630 Jonsereds. Was told by the Husqvarna dealer that this 630 was the same as the 262xp piston.

My goal is to eliminate the 261 dished piston. And modify the exhaust. I picked up this very clean 261 having this project in mind.

DHansen · May 27, 2022, 05:13:05 PM

I also could just go with the Meteor Piston #503 53 11 71 Just trying to decide which would be the best option based on what is still available.

Spike60 · May 28, 2022, 06:41:21 AM

That actually doesn't work and the dealer is mistaken. The 630 P&C is the same as the Husky 162SE that preceded the 266SE/XP, not the 262 which was built on a smaller chassis. True, both are 48mm, but they will not swap back and forth. Easy mistake to make and the good ole 162 is largly forgotten as it gave way to the 266 after just a few years. 1983/4 I think? The Jonny 630 continued to use that same top end throughout it's model run up to 1997.

That being said, grab that 630 piston as they are long gone. There are some AM options that work. The windowed 61 piston works OK in those saws to freshin them up. I wouldn't be afraid to use a decent AM piston in your 262 project. OEM parts for that 254/257/262 chassis are rapidly going away. Not even sure what I have left for them.

I've done that 261 to 262 conversion to a couple saws myself. There are 2 cylinder gaskets for those saws. Make sure you use the thinner of the 2.

DHansen · May 28, 2022, 07:03:24 AM

Thank you Spike. I appreciate your expertise. Watched a few videos of you explaining the 200 series of saws. Would you recommend Meteor brand piston?

Spike60 · May 28, 2022, 08:38:40 AM

Meteor should be fine. Brands of AM pistons aren't a big deal. IMO, they are pretty much comparable. It's the cylinders that have big differences in quality.

The gasket you want to use is 503 704 801.

DHansen · May 28, 2022, 09:08:18 AM

Thank you again, you are a big help.

Spike60 · June 24, 2022, 04:47:28 AM

I ran my 261 to 262 conversion last weekend and I'm curious how your project is coming along. One thing to think about is that the 261 used a muffler that was different and more restricted than the standard 257/262 item. The original muffler had a good size hole and really doesn't need to be modified. The 261 muff had a box with small holes built around the outlet on the inside. Same deal you'd see on some 51/55 mufflers. Might want to let that thing breath a little better.

DHansen · June 24, 2022, 10:22:39 AM

Bob, the gasket you recommended came in and I am picking it up today. I have had storm damage here and have been using the 266 and 61 to get jobs done and get caught up. Will keep this thread updated with progress.

DHansen · June 24, 2022, 07:32:21 PM

Gasket in hand. Clearly a Victor Reinz manufacturer gasket. What thickness should this gasket measure? Meteor piston is still about a week and a half away. Shipping snail mail.USPS.

Spike60 · June 25, 2022, 05:45:59 AM

Don't recall the gasket measurements; maybe 1 mm difference? Just know that there are the 2 of them for this chassis and the thinner one is the way to go. I think the thinner of the 2 was for the 261 as they were maybe trying to get back some of the compression lost with the dished piston. Strange recipe for the 261. When they choked down the muffler they added those useless slits in the front plate. Object for the 261 seemed to be, "Hey, let's ruin a good saw!".

How much storm damage are you dealing with?

DHansen · June 25, 2022, 07:22:25 AM

Had to put new roof and roof decking on the house(cabin). Structural engineer is coming out to look at the machine shed (metal pole barn). Uprooted a 95' pine and the pine cut the pole barn in half. Lost the top 30' of five other pines. Lost a maple and an ash. No one hurt, and everything is repairable. Could have been worse. Also been helping neighbors with tree debris clean up. Still more to do, but under control. We had power (electricity) back up in 24 hours.

Spike60 · June 26, 2022, 07:27:23 AM

Ouch, that's a mess. Pole saw would be real handy there.

DHansen · June 26, 2022, 04:07:41 PM

It was.

DHansen · June 26, 2022, 04:09:08 PM

No damage to the out house or my dad's pole barn.

SnoJetter · June 27, 2022, 08:28:07 AM

Where (roughly) in MN was this damage? We're near Alexandria and had two tornados in less than two weeks in the area. Thankfully we escaped with minor damage. Lost 4 trees: two that went down in the woods so I'll let them sit until the winter to clean them up. One was leaning over the garage, but the wind took it down away from the building (Phew!) but it did take out one of my wood piles. The third is hanging up in another tree near the shop but it can rest there for awhile. Definitely more significant damage by other neighbors and 30 miles away whole neighborhoods were rearranged...

I've been here 17 years and never been through this kind of storm - let alone twice in the same month!

DHansen · June 27, 2022, 09:57:03 PM

Pine county, West of Pine City. E1 tornado. 14 confirmed touch Downs in Minnesota that evening. Still waiting on a structural engineer to evaluate the barn.

SnoJetter · June 28, 2022, 08:55:02 AM

Sheesh, when did Tornado Alley move north to MN?? It was a wild spring!

Real1shepherd · June 28, 2022, 10:27:05 AM

MN has always had some tornadoes. I saw one swirl on a lake once up there. The "experts" say that's not possible over water. I saw it with my own eyes....but I guess that doesn't count. 8)

Back in MO on the farm we had updrafts, downdrafts, micro bursts and tornadoes. Always 'exciting' seasons back there and then there was the flood of '92'-93.

Kevin

DHansen · June 28, 2022, 09:38:53 PM

Kevin, I thought those were called water spouts. And I don't understand why a tornado couldn't go across a lake.

DHansen · June 28, 2022, 10:00:14 PM

Piston showed up today. Photo of the clean 261 I picked up.

DHansen · June 28, 2022, 10:07:12 PM

Spike60 · June 29, 2022, 05:20:41 AM

She's in good shape. Going to make a nice project.

Real1shepherd · June 29, 2022, 08:53:55 AM

Quote from: DHansen on June 28, 2022, 09:38:53 PM
Kevin, I thought those were called water spouts. And I don't understand why a tornado couldn't go across a lake.

I saw it swirl water just like a tornado and then go back up in the clouds....water came down with fish, debris etc......I was that close....dumb kid fascinated with what I was seeing. It was huge too...the diameter of it when down on the water.

Kevin