Roper 3.7 tear down and rebuild

[JonCraig]

Got some time for it a few days ago. Had a XL12 piston brand new that seemed a perfect match. I have everything back together now, tried to start but she wouldn't pop. Was getting late so I stopped working. I have tomorrow off work, so I plan to get her running. Thanks again for the plethora of parts. They've been needed!

--JC

 

[JonCraig]

She runs! I got freaked out at first because it was throttled WAY up--I suspected a big air leak. But I'd already pressure & vac tested? As I was taking carb off again, I heard a small rattle. Lo and behold, a small screw sitting inside the reed cage! It was the throttle plate screw! If this had been a piston-ported saw, that screw likely would have nuked it.

Anyway... Who knows how many drive links of .325 it takes for the original 18" banana bar?

 

[JonCraig]

This look like it means 66DL to you?

 

[Opihi59]

I'd go count chain, but I convert all mine to 20" 3/8 chain/bar now, using a 3/8 rim sprocket from Huskvarna. I think I have the info buried somewhere back in an earlier post.

 

[JonCraig]

The one I have still has the original bar, so I think it would be cool to use that one (helps that it's the only extra bar I have, too).

I don't remember if it already had a chain on it when I got it or not... I'm thinking it was so rusted it was a goner. (Maybe I should have sent it to Philbert?)

In any case, the bar appears to be .050. The only other .325 pitch chain I have is on my 028S, but it's.063, so I can't even get it in the bar to make a guesstimate on how many DL the roper originally took.

 

[jerrycmorrow]

wrap a string around it, measure length, divide by chain gauge (3/8, 0.325, etc.), divide by 2. should give you a good estimate. OR take it to a saw shop and let them measure it.

 

[s sidewall]

My chain has to be made at the shop, has the original 17" bar on it, the chain looks like it is too.

 

[s sidewall]

Opihi59, how have you made out on getting a check valve for yours?

 

[Opihi59]

I did get the check valve, I think 3 of them, I have not had a pressing need to work on the saws lately as other projects are consuming me, but at some point I'll give one a try and see if it will work. I know it seems like it would just take a minute to do, I just haven't done it what with building a motor bike from scratch, remodeling the laundry, utility bathroom and man cave so I just have my energies directed elsewhere. I will of course post in the results.

 

[s sidewall]

Remodeling is a night mare on its on, good luck. . Ya, let us know how the valve works out and what kind you used.

Steve

 

[Pa.coal Dave]

I ended up covering the old air filter with a piece of shop vac filter. Don't know how long that will last but it works better than nothing.
Got the Husqvarna (445) but it doesn't hold a candle to the old Roper today.

 

[JonCraig]

I have a box of leftovers that @jerrycmorrow gave me. I don't think there's a usable jug in there (I think I got the last one), but there's plenty of extra pieces. If anyone wants to pay shipping, it's yours. Just paying it forward.

 

[s sidewall]

Did you get yours back to running Jon?

Steve

 

[JonCraig]

Sure did, and then my Dad wanted it so bad I sold it to him for what I had in it. Probably should have just given it to him, in hindsight.

 

[s sidewall]

Would have been nice, we dont have our parents forever. Mom pasted two years ago on New Year's Eve and now it's just dad. He's 81 and me and my brother will do just about anything he wants done.

Steve

 

[s sidewall]

Oh, by the way, glad you got it running, I'm just glad my dad can't pull mine with the decompression on, be might get hurt with that saw.

Steve

 

[mohick]

John Graig I got one of those bars and chain hanging in the barn, will count after daylight never used it change everything to 3/8 looks to brand new . saw is great just have no use for .325 stuff

 

[RobertJ]

Any follow up on the duckbill ? I'm looking for one that allows air into fuel tank, just above flywheel, ahead of Air intake. It's a 1/16 npt. Any new oem, or used valves are prolly going to be hardened with age, rendering them useless. They were made of Buna, I believe. Silicone would be mucho gooder. Plus, that oem set-up should have been engineered with some sorta filter.

 

[RobertJ]

This thread sure died, ....................... like pulling the plug.

 

[s sidewall]

It still around, not many of us still trying to patch up a roper, just gettem running and put it on a shelf.

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