CNew

That photo from Webhead is like the engine I have. It’s interesting, mine has the P-5 sticker on the front but I think on the bottom of the recoil cover there is also a sticker with what looks to be P-4, I’ll have to verify when I get home.

I’ve got an engine that needs a new spring for the Governor adjuster lever, specifically the little spring loaded post that locks the lever into position. The last spring was mangled and mostly missing so I don’t really have any dimensions to work with in order to find a replacement and I don’t want to try to pull one off a perfectly good engine. Does anyone know roughly what dimensions might be suitable? I was able to find a hardware supply source that has some small springs (these are not OEM for O&R) and I’m wondering if they might work well enough. The overall uncompressed length is 0.25”, the ID is 0.080”, the OD is 0.12“ and the zinc coated music steel wire itself has a diameter of 0.020”. The spring is rated at 46 lb/in with a max of 4.14 lb. Also, is the little copper colored spring retainer/keeper on the Governor shaft spring just copper or some other alloy. Mine is missing half of the spring. Clint

Chris, I was watching that manual as well but decided I had to pass on it and that was way before it jumped in price. It would have been a really neat book to have. David’s willingness to post various tool documents and part diagrams has been amazing! Clint

Good to know. I’ve seen tha P-74c decal on eBay and I always wondered what engine that was for - makes sense now. I’ve purchases O&R decals from that same guy before. My little TAS P-5 is in need of a decal, although I’ve seen a couple other P-5 engines that didn’t have decals either so maybe they didn’t have one. My P-7 has a decal that is still in good shape.

I’m finally in the re-assembly phase. I went through just about everything. I’m working on the gas tank now trying to clean out some gunk and varnish. Once that’s done I’ll be ready to do the finish it up and then hopefully my new decal will arrive. I’m also delayed for some ultra small fuel line for inside the gas tank. The little fuel filter looks to be attached with 0.080 or slightly smaller ID tubing. I’ll add some photos when it’s all back together. Cleaned up pretty nicely.

I’ve got a trip planned to the local metal supply. I’ll look for some small strips to maybe fab some straps. Cables ties are a good temporary

Wow, that’s one gorgeous saw! Great photo David!

David- your sleuthing abilities are astounding. Yep, that’s the plan. I put some oil in through the spark plug hole and I’m letting it soak this week. It’ll be a little bit before I have time to work on this one anyway, I’ve got a couple projects ahead of it. I may have a key from another engine I can use and as you suggest it doesn’t look like it would be too terribly challenging to fab a key. John, great idea with the pump - I think that’s exactly what I’ll end up doing with this one. If I can tweak the base and tidy it up a bit this could be a nice item (even better when I get this engine working). Good to know, thank you for the tip!

Unfortunately the engine I have is completely seized up. After opening it up it looks like the piston and crank may be royally jammed up. It’s completely rusted inside the piston bore. I’ve got some penetrating oil in it to hopefully free it up but it doesn’t look good at all on the inside. As always seems to be the case mine is also missing the air cleaner assembly. I will also need a flywheel shaft key and tank strap as those are both missing. Screws for the recoil cover are easy. That is indeed the same style base that came with mine. Glad to know what it was originally used for, never heard of the Merck-O-Tronic. My base has seen better days and it is bent quite a bit so it’s not at all flat and stable. I’m hoping I can straighten it out somehow, at least enough to make it functional.

Thanks David, good to know. It’s a “scrap” engine that was mounted to a vintage stand that looked like it might have been a display model of some kind. That’s why when I saw “Model” on the side I thought it might have been unique to a display or salesman sample or something.The stand looks factory made for it but I got the engine to get some spare parts.

Chris, Sounds like we’re on a similar journey with these O&Rs and you’ve got a nice collection going. I’ve been collecting since about December of 2018 and slowly adding to it as often as I can. It’s addicting! I haven’t been able to get my hands on a Tiny Tiger or Amp Champ yet. I’d also like to find the little outboard some day. John turned me on to the Homelite saws as well. I haven’t been able to add one to my collection yet but those are pretty cool too! You did a really nice job cleaning up and fixing the Comet C-saw. It looks to be in really good shape given the hard life it had. They’re fun to work on. Clint

Here’s one for you David, is this a typical marking on some of the O&R engines? I hadn’t seen this one before and was wondering if it was common or maybe an odd ball. I’m guessing it’s intended to say MODEL but the “M” didn’t really get stamped well.

Nice touch with the bare wood pull starter knob. Is that original to the saw or did you sand off the black paint that is typical and oil it, looks nice all natural! Clnt

Webhead, Good to see you. I haven’t run into these little clips yet on any of my engines, guessing they’ve probably been removed or lost along the way. They do look like they would be a pain to install. Clint

I watch those come up on eBay and drool over them. Maybe one day I’ll finally expand into them as well. Lately I’ve been laser focused on getting my collection going of the 1hp O&R engines and tools.

Bob, Very nice, do you have the old O&R 60 or the 23 or 19 spark ignition engines? Those are really cool! Clint

Thanks David! I have a couple Champion UY6 plugs I bought for my first O&R engine, I’ll take a look and see if they will also fit the TAS P-5. Clint

Chris, Good to have you on the forum! Great C-saw and nice work fixing the recoil spring. I’m still fairly new to these engines and this will be great info to know if I ever run into a similar problem. I’ve repaired a couple coils so far but never had a spring in the condition you had to deal with. David and John are awesome, their knowledge on these engines is incredible and their willingness to help educate those of us that are newer to this is amazing! I’ve benefitted greatly from their expertise and advice along the way. Clint

Good point, those other larger items like tanks would take up a bit more room. Ok, good to know - this is all helpful for me to think through the packing and shipping process.

Absolutely, I’ll keep on the look out.

Bob, Understood. I’m getting closer to a number to throw at you for the parts. I’ll do the best I can based on what all I can see in the photos. I’m curious, do you think all the misc small, loose used and NOS parts that are on the tarp in the photo (not the all saws, trimmers and other tools) would all fit in a large USPS box? I think if I can make a trip out to your place I could pack the stuff properly and deal with the shipping. Clint

Excellent, thank you very much. I think I need the 10mm version for my P-5. I’ll look for a CMR7A. Much appreciated! Clint

Great, thank you. Can you provide the spark plug part numbers that are stamped on them? I might be able to source these if I can get a couple numbers to start from. Thanks! Clint

Wow, that’s a beauty- that turned out amazing, very nice work! Thank you for the photo. Good to know about the blasting, I may look into that as well. When I first went through the original post I saw the little orange NOS P-5 engine that Wallfish had and assumed it was this engine but I see now it’s a P-7. I have a P-7 as well that is mounted to an ice auger and it’s in pretty nice shape. I picked up a little orange P-5 not too long ago but haven’t been able to dig into it yet since I’ve been obsessed with the little Ohlsson Rice Engines. I hope to mess with P-5 before long and at least see if I can get it running. One challenge I’m having with the old P-5 is locating the proper spark plug. The one that’s in the engine now is a NGK C-40 and I can’t seem to find any information on this plug or it’s equivallent number today. The P-7 wasn’t too difficult but the plug on the P-5 is much smaller. Please let me know if you have any suggestions. Clint

Bob, I just sent you a follow up PM.