Chainsaw Repair

Husqvarna - Stihl - Poulan - Jonsered - Dolmar chainsaws and more => Jonsered => Topic started by: man of stihl on August 20, 2014, 08:06:00 pm

Title: Jonsered 2149
Post by: man of stihl on August 20, 2014, 08:06:00 pm
I have a 2149 with the 49cc (i think) open port top end. I bought it at an auction but Its in good shape and I'm thinking it will be a keeper.my question is should I buy a closed port OEM 52cc 2152/late350 cylinder with a 353 piston or a 2153/346NE cylinder? There is nothing wrong with the p&c in it now. I was just wondering if there will be a huge difference. I currently have a stock oe346 and the open port 2149 is real close to it. So, what do you all think? 2152 cylinder/353 piston, 2153 p&c, or leave as is?
Title: Re: Jonsered 2149
Post by: Cut4fun . on August 20, 2014, 08:11:15 pm
Are you porting whatever you get or leaving stock?   I still think a 50cc 346 top would be hard to pass up from those choices. 
Title: Re: Jonsered 2149
Post by: man of stihl on August 20, 2014, 08:13:27 pm
No porting. I don't think.... ;D
Title: Re: Jonsered 2149
Post by: aclarke on August 20, 2014, 09:48:41 pm
Curious if 346 will fit on a p5000?
Title: Re: Jonsered 2149
Post by: 660magnum on August 20, 2014, 10:07:50 pm
In the 5000 the port lower transfers are in the cylinder wall?

The 346 they are in the base
Title: Re: Jonsered 2149
Post by: 660magnum on August 20, 2014, 10:14:03 pm
Part of the MVP trick was to take out the cylinder wall where the transfer was and make the 5000 a open port?
Title: Re: Jonsered 2149
Post by: aclarke on August 20, 2014, 11:40:24 pm
Marcel took the bridge out of the transfer on the saws I've seen.  I believe the p5000/500 series had both type cylinders opened and closed. I'll have to look but the case may be machined for open as standard?
Title: Re: Jonsered 2149
Post by: Cut4fun . on August 21, 2014, 12:50:25 pm
Yep my MVP166 and copy of MVP's 5000's had the bridge removed in all of them. Open port.   ;) ;D
Title: Re: Jonsered 2149
Post by: 660magnum on August 21, 2014, 01:42:10 pm
I never seen the 166 run but the 5000 was the runningest 3 cube chainsaw I ever saw.
Title: Re: Jonsered 2149
Post by: Spike60 on August 24, 2014, 05:27:25 am
Buying the 353/2152 top end really doesn't offer any improvement over what you have. 2153/346 is the only route to go if you are going to replace it.

But........before tossing the current cylinder try deleting the gasket and doing a muff mod. Those cylinders actually run pretty good, and you might be surprised. As you already posted, it's real close to the 346OE, and the difference is not huge at all. Not enough to replace a perfectly good cylinder IMO.
Title: Re: Jonsered 2149
Post by: SawTroll on August 28, 2014, 07:49:03 pm
Curious if 346 will fit on a p5000?

The stroke is different (32mm on the 5000, and 32.5 on the 346), so basically not. There likely are other show stoppers as well, including what 660magnum said about the lower transfers. The carb of the 5000 also is too small for the 346 top end.

A lot can of course be worked trough or around if you know what is needed and how to do it, but at best it is far from a "bolt on" fit.