K&B .65 Thrust Washer - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-14-2020, 10:49 AM   #1
NEW222
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K&B .65 Thrust Washer


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hi all. So I may be getting an old K&B .61, or so it looks like a K&B by the carburetor and top end, but it is missing a thrust washer, prop washer, and prop nut. The prop washer and nut i can take care of, but the thrust washer..... I did a little searching for one but came up empty handed. Does anyone happen to know of a source for one, even very used would be more than fine. I will hopefully know if I get it later this afternoon, but seeing if it is even worth getting. Need a 60 size engine for a sport plane i am currently repairing for next year, and this had popped up sorta locally. Or is it best to just pass up and look for something else. Thanks.

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Old 09-14-2020, 11:35 AM   #2
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Re: K&B .61 Thrust Washer

http://www.mecoa.com/kb/parts.htm
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Old 09-14-2020, 08:17 PM   #3
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Re: K&B .61 Thrust Washer

Well, as of right now, I have decided against picking up the engine. It is not a big rush as said before as it is for a plane much further down the road (VMAR Cap 232), so I now have a bunch of time to keep looking for something better. But on the flip side, it is still available....
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Old 09-15-2020, 08:37 AM   #4
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Re: K&B .61 Thrust Washer

I have two K&B .61's, one has a tapered split collar and one is driven by a flat spot on the crank. Make sure you increase the oil quantity in the fuel to 20%. I use Sig de-gummed castor oil - 150ml. These are exceptionally well made older engine.
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Old 09-17-2020, 08:41 PM   #5
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Re: K&B .61 Thrust Washer

Ok. So I could not let the engine go. I picked it up today. Locked up solid, missing the thrust washer. Took the backplate off, removed the plug and took a peek. It looked very nice inside and no corrosion at all. Almost spotless except for the bit of dried up castor oil. Used a small torch and heated it up, put a prop nut from my LA on it and carefully rotated it and it did start to move. I then put a few drops of oil all over, here and there. Once freed up, I used my pliers on teh nut and spun it round and round for a few minutes. It is now free, and seems to have very good compression. Carburetor was also removed and required no heat to rotate the carburetor barrel. So before I put an ad out, I would just like to confirm that this is indeed a K&B Sportster .65 engine. The thrust washer needed is the one that is round with a flat spot on it. Thank you.
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Old 09-17-2020, 09:54 PM   #6
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Re: K&B .61 Thrust Washer

I have a half dozen K&B Sportster engines, nobody wants them. The last time I bumped my oil content up to 20% as the engine manufacturers recommended my engines ran like crap. I ran Fox engines that recommended 25% Castor oil with the same result. I could never tune an engine that had too much oil in the mix. Castor oil is a thing of the past, unless your running a bushing engine. I run all my engines on Synthetic at 17% oil and have for years with no issues at all. And I run my engines one click from lean on both needles. Cheers Floyd
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Old 09-17-2020, 11:09 PM   #7
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Re: K&B .61 Thrust Washer

Thanks for the tip on the oils. When I get the missing thrust washer and run it, I had planned on using my Omega 5% with a bit of extra castor, but will now just run it as it comes from the jug.
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Old 09-17-2020, 11:24 PM   #8
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Re: K&B .61 Thrust Washer

Is there something I do not know about the Sportster engines? Hard starting, heavy? You mentioned that you had a few and nobody wants them. Thanks again.
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Old 09-18-2020, 10:06 AM   #9
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Re: K&B .65 Thrust Washer

I ran a 45 Sportster years ago and it was a great little engine. It made a rattling noise at low rpm being a bushing engine, but mine ran a 11X7 prop which was a 61 prop back in the day. So set up right mine ran fine, I would run another one if I needed to without hesitation. Cheers Floyd
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Old 09-18-2020, 11:44 AM   #10
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Re: K&B .65 Thrust Washer

Just to clarify in the hot months I will ad 1 ounce of Castor 927 into my mix. I substitute 1 ounce of Synthetic for a ounce of the 927 just for my own comfort knowing I have some extra protection. The 927 is a concentrated racing Castor oil. Just 1 ounce in a jug of fuel and I can smell the Castor in my exhaust. Its a lot thinner and flows better than the old Castor. If I wanted to run any Castor oil the 927 would be my first choice. Cheers Floyd
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