factory

The gearbox is part of the engine, which engine type is used on this Mustang? Here is the gearbox diagram & parts list for engine Type 185, which was used on some Mustang chainsaws. David

Well I've accidentally bought myself a O&R powered mini-bike . It's one I've not seen before, does anyone recognise it? David

Looks a nice water-cooled conversion and reasonably priced too. David

That looks pretty good as a replacement for the spark plug insulator #6-3, I wouldn't necessarily say they are missing for all engines, as shown in the 1961 brochure/price list they were sold as an accessory & none of the engines are shown with one fitted. The 1961 price list was uploaded to the manuals thread, see Section 1, I really should have separated it into the brochures section. I've been using Hellermann rubber sleeves for the brass tab type stop/kill switch, I might have ended up with a few when I bought & cleared the contents of the electronic parts storeroom at work. David

The pump (picture seven #33/4/21 in the gas engine magazine link) is a Paradox or Electro-Flow pump, see here; I have the Electro-Flow branded version in my collection. Edit: just read the description for the photo, I see the O&R pump was found in South Africa. David

I can't check tonight but I think the rollers from A-20-5-13-7 & A-20-5-16-7 may be the same as "20-5" is coded into both part numbers, 20-5 is the roller originally used in A-27-11. By the way I checked several packs of A-20-5-13-7 and they all have a waxed strip of 16 rollers, even though only 13 or 14 are needed depending on which service information is correct. David

Apart from the roller part numbers everything else is the same as the information I posted on the previous page (posts 19 & 21), the larger diameter bearing assembly was introduced between April & August 1964. Nice to see that page from 1963 confirming the need to change the con-rod to a slotted one when using the all metal con-rod bearing A-20-5-13-7. David

Thanks for measuring those Brian, I will see if I can find a supplier of 1" aluminium pipe. David

Those early engines have some smaller sized bearing assemblies, I'm fairly certain the con-rod bearing is too, that's why they give so many parts to change if replacing the plastic caged types. Edit: Later engines have several beefed up bearings on the crankshaft/backshaft. David

The maintenance manual* does state 14 rollers are used for the con-rod big end and 19 rollers used for the con-rod little end, but I think I should also check some unopened packs of these bearings to confirm this as the later parts list fail to mention any quantities for the rollers. *The manual is supposed to be for the 1HP engine, but I have a picture from one of my restorations showing 16 rollers on the con-rod big end for a 1HP engine. David

Could be either, maybe original adverts could help or add to the confusion, if any ever turn up. David

The spacers were made to approx 11/16" length, the wide washers are to prevent damage to the cover (two used per screw). I had to order more screws (#6x32 2" long) as the first ones I ordered were too short, a set of these were sent to Paul for his Aquabug restoration. David

If only the people at work could keep their fingers out of the large gears when taking apart axle mounted gearboxes too. David

It's all down to the fonts used, at least John's picture confirm what you saw (no pun intended) on yours before restoration. There is also this smaller decal on the red version of this chainsaw, again not very clear. I have to say Paul Bunyan/Bunyon chainsaws are a PITA to research information about due to the amount of other things with the same name. David

Will check them at the weekend, I ended up making my own from brass tubing as I couldn't find anything suitable. David

Exactly as it would have been in the 60's, as shown in this Speedy Sprayer brochure (no O&R's present). David

Nice to hear you found more parts from the trimmer, I have some of the small parts for those but sadly no cutter head, I intend to try & build one using a spare engine, will need to make a lot of the larger parts and see if I can find a modern cutter head that could be used with it, this is a long term project of mine. It would be helpful to know the length of the aluminium tube(s), please could you let me know the size. I do have this parts diagram for an earlier variant of the trimmer (known as the Power Whip), I can't see a trigger control on this version, but the diagram may help identify more parts you may still have. Forget to mention before, looking at the first three digits of the serial number I can tell you that the engine from your trimmer was made in April 1977. David

@Webhead Do you have a before picture of the bar from your chainsaw, I'm yet to see a clear enough one to tell if they spelled it incorrectly originally on the bar, certainly the small round logo is spelt Bunyan. David

You should have an email with the two page brochure attached. David

John I still need to complete quite a few unfinished projects here, before I make a start on that nice trimmer (or take anything else apart), maybe I should add some pictures anyway. Nice find with the manual and EP Barrus advert, I seem to have the matching "illustrated literature" for that Orline hedgetrimmer. David

I thought I had uploaded that one but turns out I haven't yet, it's from a two sided brochure leaflet from 1963 (the source of my avatar image), I have a four page brochure from 1963 plus some other bits to add to the "manuals sticky thread" in the future. Would you like me to email you a high resolution image of that page? David

Ohlsson & Rice Compact engines appear regularly on eBay, you shouldn't have difficulty finding another suitable engine for a boat. As well as being incorporated into many different tools, the engines were available for anyone to use for making their own tools or for powering models etc. Some O&R engines can also be found with water-cooled cylinders for model boat use. David

The old ratios used were 11:1 till 1963 then 24:1, we have been using 32:1 with modern mineral based 2 stroke oils. I've only seen a couple of these 1HP engined versions, the larger 1.6HP 20A engined version is only slightly more common due to eight boxed ones appearing from one seller in 2018/19. David

Here is what the Groomer Estate 400 in this thread would have looked like, sorry the picture isn't very good quality, I don't have any original documents for the majority of the AEP powered string trimmers. David

Thanks Clint, I'm a bit surprised no-one has added a link to here in that thread. David