346xp oe rebuild thread - hyway cylinder

[Mattyo]

Welp, the guy who I'm building this for may or may not chime in here... but ya'll know him

He sent me an oe 346xp that was trashed. I've taken the vid of the teardown, and I've decided to split the case too, because I noticed the main bearing has a nylon keeper... instead of metal. Spike60 is sending me the necessary oem parts.

Stay tuned for the vids... hopefully I can have the teardown vids up soon.


BUT ...... BUT BUT BUT.. .. noticed something interesting. I have a hyway 45mm cylinder, and a meteor piston. Put it on the saw, with the gasket, stock. The piston skirt HITS the chassis. Because its an oe? is the chassis SLIGHTLY smaller? Anyway, found this interesting. I will be putting the chassis on the bridgeport to deck it by .025. This will optimize squish. But I guess I also need to take the dremel to the crankcase to make a tiny bit of clearance for the piston. Again, stay tuned for the vid.

 

[jacob j.]

I had a couple of the OE cases that wouldn't quite clear a 45mm piston, but it was easily fixed as there were only two spots that needed touched up.

 

[RIDE-RED 350r]

It's my understanding that the NE topend is a direct bolt-on replacement for OE cases....

Is it possible this clearance issue is due to it being a Meteor piston and possible slight differences it may have compared to OEM?? No offense intended toward Meteor, I love their pistons, just curious....

 

[Mattyo]

Very possible.

Also...oem is 44.3

Hyway is 45mm. No much diff....but a difference no doubt.

 

[Tor R]

What year was your 346 oe made?
First model 1999 crankcase where # 503 85 69 71.
Second model 2001 crankcase where # 537 17 19 01.
Third model 2003 crankcase where # 537 17 19 03.

Not 100% but the main change was on s/n 03 05 00001, where 353 came if I got it correct.

 

[Adirondackstihl]

 

[Mattyo]

I think it's a 99

No primer bulb

 

[Mattyo]

Had a metal clamp...but likely whoever installed the clamp messed up the intake boot and ripped the impulse nipple causing an air leak which killed the saw.