Excessive Pin Boss Clearance on MS361 Hyway Pistons

[wcorey]

Tecomec piston is 15.5mm between pin bosses.

BTW: if anyone has trouble seeing this pic on their machine, please advise. Photobucket is giving me fits these days.

Unfortunately you appear to be afflicted with the paid 3rd party hosting issue...

 

[Wood Doctor]

Tecomec piston is 15.5mm between pin bosses.

Unfortunately you appear to be afflicted with the paid 3rd party hosting issue...

I'm going to look for a new host. Photobucket is history. I'll move all my stuff away from it or I will simply use an upload procedure directly from my own hard drive. Seems like our site could offer something like that for posting pics as attachments, but I believe we have to go through a host site to show our pics. If I'm wrong, please advise.

 

[PogoInTheWoods]

You can add pics to a post inline here. Easy. As for off site alternatives, I go with Google for all that stuff. Gov't. already knows everything they need to about me anyway, so...

And I'm going to order that Tecomec kit for my MS361. Have you measured the squish w/o base gasket?

 

[wcorey]

And I'm going to order that Tecomec kit for my MS361. Have you measured the squish w/o base gasket?

I haven't put it on a saw yet as both of mine are runners. Bought it and a crank on that crazy sale they had on here a while back.
Was just too cheap to pass up, figured I might pick up one of those chicom 361 kits to put them in but then picked up another oem 361 so seemed too redundant at that point.
Wish I had bought a few more of these p&c kits but at the time didn't know how nice they looked.

Also picked up a couple of the Tecomec 242 kits fairly cheap and was equally impressed.

I did compare measurements against a stock cylinder and seem to remember them as being very close. Can check again for specifics if you want, I also still have an unmounted stock cylinder kicking around...

 

[Gentleman]

Was considering the Tecomec but hadn't heard much about the quality of their product's recent foray into that price range. May need to try one of those for my own 361 project in a box. Price sure can't be beat for a NiSi kit.

I wait on the reply from Hyway.
The Tecomec is very nice but they do not produce the AM parts anymore. So when they are gone, they're gone.

 

[Lightning Performance]

It's it nice to call a place and some sweet lady answers. I got to meet her on day one. Caliper hu. Mmm. Anyway, I will check a shelved 361 white box no name kit from them /here last year or so ago. Never check the pin bore width. I did trash a white box 361 piston. Thin ring, thick land, whoops.

 

[PogoInTheWoods]

The Tecomec is very nice but they do not produce the AM parts anymore. So when they are gone, they're gone.

One on the way for my MS361 along with an 028 Super popup piston. 'Preciate the heads up. May need to snag a couple more project pistons before they're all gone.

 

[Wood Doctor]

You can add pics to a post inline here. Easy. As for off site alternatives, I go with Google for all that stuff. Gov't. already knows everything they need to about me anyway, so...

Interesting. How do you get a URL from your own computer that this site will accept so that the Pic will display? Doesn't that mean that you have to set up your own website as a host?

 

[PogoInTheWoods]

Yes and no. A remote URL link would need to be on a web server somewhere pointed to your pics. Google. Your house. Hillary's house..., Russia, wherever.
Easiest way is to just 'Upload a File' from the button at the lower right of a composition page. That'll take you to the directory structure of your own computer to locate the file. Select the file. Like this...

Once you select the file it appears as a thumbnail at the lower left of your post with the option to show it full size. Select that and there you go.



All that said, you need to be using the Rich Text editor and using Flash to upload attachments for it to work the way I explained it. You'll find those options in your profile 'preferences' here...



Now where were we? LOL

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[67L36Driver]

My knee jerk reaction would be to make a pair of spacers out of Westinghouse Micarta.

You can get it in rod form and just drill and part it off in a lathe.

 

[PogoInTheWoods]

I wait on the reply from Hyway.
The Tecomec is very nice but they do not produce the AM parts anymore. So when they are gone, they're gone.

Curious as to any response from Hyway..., and whether the piston in the following pics is normal for the Tecomec MS361 kit.

Finally popped the box on it today to start my other rebuild. Beautiful cylinder. Piston is another story altogether, again. It almost looks used. At least the pin bosses are correctly spaced. Sheesh. Good thing the original OEM piston is still in decent shape for this one.

On the other hand, I also got a Tecomec 028S popup on the same order. Night and day for quality. No comparison. Beautiful piston.

If the 361 kit wasn't such a screamin' deal (at least for the cylinder), I'd request a replacement piston. Not sure I'd have much faith that this one wouldn't just start flaking apart immediately. Wonder what Tecomec would have to say about it.

Here's the one for the 028S...



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[BuckthornBonnie]

Curious as to any response from Hyway..., and whether the piston in the following pics is normal for the Tecomec MS361 kit.

Finally popped the box on it today to start my other rebuild. Beautiful cylinder. Piston is another story altogether, again. It almost looks used. At least the pin bosses are correctly spaced. Sheesh. Good thing the original OEM piston is still in decent shape for this one.

On the other hand, I also got a Tecomec 028S popup on the same order. Night and day for quality. No comparison. Beautiful piston.

If the 361 kit wasn't such a screamin' deal (at least for the cylinder), I'd request a replacement piston. Not sure I'd have much faith that this one wouldn't just start flaking apart immediately. Wonder what Tecomec would have to say about it.

View attachment 80293

View attachment 80294

Here's the one for the 028S...

View attachment 80296

View attachment 80297​

Yuck

 

[wcorey]

Yah, that looks pretty funked, mine looks like your 028 piston...

 

[Gentleman]

following pics is normal for the Tecomec MS361 kit

It's a coating. They say it helps with break-in. Probably been sitting around for years. We bought that Tecomec closeout last November. Not sure how long ago that stuff was made.

 

[PogoInTheWoods]

I'm familiar with the coatings..., typically Teflon. Even that was poorly done! I was referring to the casting flaws and flaking with this particular piston..., especially at the ring lands and skirts.