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Post  balogh Fri Dec 24, 2021 9:07 am

Bob plier marks sand off of the mild steel fins easily, and than you only need some gun blue..seen that done that...
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Post  davidll1984 Fri Dec 24, 2021 9:13 am

Despite the fact that these two evolution engines are not vintage, they are a good engine in my opinion, I have a .60 which surprised me very reliable although quite inexpensive i like m'y évolution engine I trust him to be installed in my super cub "Pretty" engines - Page 2 16403510
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It's a mess in there Santa Laughing lol! I don't dare take a picture of the whole room
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Post  944_Jim Fri Dec 24, 2021 10:01 am

Thank you Fred,

Now I know how Baby Bees are made... Shocked

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Post  rsv1cox Fri Dec 24, 2021 10:38 am

balogh wrote:Bob plier marks sand off of the mild steel fins easily, and than you only need some gun blue..seen that done that...

The easy way Andras is to chuck it up in a drill press and use a jewelers file to remove the worst of the dings, then polish with 600 grit wet/dry paper.  I wrap masking tape around the interior threads to protect the bore.  

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The sharp edge of an equalizing file lightly applied to the interior of the fins does wonders.


I didn't do that with the "Ugly" engine, didn't want it to look too good.  Smile


Last edited by rsv1cox on Fri Dec 24, 2021 11:50 am; edited 1 time in total
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Post  davidll1984 Fri Dec 24, 2021 11:01 am

I wanted to do the same but I think I went a little hard on this Queen bee cylinder Laughing "Pretty" engines - Page 2 16403610
Laughing lol! No, it's just a joke, it's for tests that I'm doing Small Cox Logo Babe Bee .049
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Post  william3590 Fri Dec 24, 2021 5:55 pm

An OPS B-20 Marine. Not many of these around. I think only 96 produced. I never got the box with it though. Sad

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Post  944_Jim Fri Dec 24, 2021 6:31 pm

Is that a supercharger between the carbs and block? Wow! What is the displacement of the engine? Huh...


Last edited by 944_Jim on Fri Dec 24, 2021 8:44 pm; edited 1 time in total

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Post  william3590 Fri Dec 24, 2021 7:04 pm

Yes indeed, SUPERCHARGED LOL

I think if I remember right it is 20cc

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Post  davidll1984 Fri Dec 24, 2021 8:27 pm

Oh my god god here one day you want to sell this b20 don't look for I'm your man I will never be able to find one that's for sure I'm in no hurry even with a lot of wear and tear I would take it A collector's item but I would like to hear the sound of this engine model and A real one in front of me not a video and Build a snowmobile for it Eyebrows The sound of that engine with pipes must be unbelievable
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Post  944_Jim Fri Dec 24, 2021 8:57 pm

I'd love to supercharge my Honda S-90...but it is 90cc, so that blower may only wheeze on it. It sure is impressive to look at! That is, that supercharger is impressive.

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Post  Oldenginerod Fri Dec 24, 2021 9:21 pm


Come in at 4.50 mark to see the OPS.  I don't want to burst anyone's bubble, but from the description on the video I'd suggest that it not in fact a Supercharger but a rotary intake valve.
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Post  944_Jim Fri Dec 24, 2021 9:34 pm

Poooff! I'm deflated. Sigh...

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Post  Oldenginerod Fri Dec 24, 2021 9:58 pm

944_Jim wrote:Poooff! I'm deflated. Sigh...

Well that wasn't my intention. Sad
I just went investigating to see I could hear one running and came across this clip. It wasn't an exhaustive search but I had found cause to investigate as I felt from the start that this may have been simply a rotary intake valve, which appears to be correct. Supercharged is a fantastic thought, but sadly questionable in this case I believe. I can easily see how one could believe is was as it has pretty much the right appearance.
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Post  balogh Sat Dec 25, 2021 1:44 am

I think supercharging makes sense only with 4 cycle engines where the fuel+air mixture is pushed by the Roots blower right into the cylinder. You cannot do that with a Schnuerle ported 2 stroker where the opening of bypass and exhaust ports overlap and the pressurized charge from the crankcase would partially be blown out through the exhaust - just like in most 2-strokers- , so the supercharging effect would be lost? Just my assumption...
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Post  fredvon4 Sat Dec 25, 2021 5:06 am

First hint was the (rotary valve) drive sprockets/gears n belt, Blown it would be other way, large drive gear and small driven gear.

Trust me there are very very small turbos and roots or scroll blowers

Turbo charging a Honda 90 is entirely possible ....$$$ Laughing
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Post  Yabby Sat Dec 25, 2021 5:08 am

If you want to make maximum horsepower with a two stroke you use piston porting as the starting point. Simple.! most brutal and violent way of delivering extreme horsepower in a 2 stroke. Most people could not ride one! they couldnt even get one off the line and moving. Lol.

Rotary ports as Kawasaki used and reeds as Yamaha used later and others used are more sane and rideable. During the 70s and early 80s the Japanese factories works GP bikes were all about absolute horsepower and then they would try and find people who could ride them. Hence grid sizes dropped and we ended up with the current benign 4 stroke moto-gp of today. Both Kenny Roberts and Barry Sheene had their GP 750 engines detuned after practice at Daytona one year as they couldnt ride them properly, they were wheel spinning them on the banking!!! Roberts was overtaking people on the banking by moving up and down the banking with wheel spin. And that was when traction control was in your right hand not a computer.

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Post  Ken Cook Sat Dec 25, 2021 8:19 am

I love the GPZ series. They were the most beautiful in my opinion. A bold statement as I'm a 73 KZ Z-1 900 owner.
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Post  944_Jim Sat Dec 25, 2021 11:03 am

Early 80s sport bikes are particularly attractive to me. Kawasaki's Concourse is one I would love.to have...the earlier the better. I'm a died-in-the-wool Honda guy, but I've always been fascinated by the GPZ 750 Turbo...and Honda's CX-650TC.

All CBXs absolutely captivate me, with the later half-fairing and aero-luggage saddlebags being especially atractive to me. Honda's air-cooled DOHC engines get me going nuts.

I owned an 82 CB900F (sadly totalled in the Mojave desert by stupid me). That one was a 1985 left-over purchase after the early 80's Japanese Bike Import glut. Then came my CB1100F in 1987. I still have that one. I even fitted the Hondaline half-fairing from the CB750/900 to the 1100. It makes the bike a highway mile eater.

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Post  davidll1984 Sat Dec 25, 2021 12:12 pm

I remember a honda model well a cb model wit hi and lower gear for street I think it was a 900? If my memory is good With a windjammer and bag ??here surely someone knows this model?
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Post  944_Jim Sat Dec 25, 2021 12:31 pm

David, that was 1982-1984. CB900C and CB1000C. C for custom. The CB750C of that DOHC era did not have the the two speed add-on unit. All three models had shaft drive, and Honda did market a Hondaline touring fairing and bags for it. The fairing was more like a Gold wing fairing than the sportier one for the Fs, CBX, and Sabres.

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Post  Ken Cook Sat Dec 25, 2021 12:41 pm

Seeing how I got the this thread all jacked up I might as well keep going. The 83 Honda CX-650 Custom is the one that captivated me. Not a turbo bike but still had the 80 deg V-twin. It's lines were very impressive for a street bike. Mimicking the V-65 in some ways with the flare of the rear fender and it's aggressive stance. Color was candy wineberry red.
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Post  944_Jim Sat Dec 25, 2021 12:44 pm

Ken,
Thread drift here is almost normal. Not at all like StuntHangar. I kind of like the segues.

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Post  Yabby Sun Dec 26, 2021 3:23 am

Ken Cook wrote:             I love the GPZ series. They were the most beautiful in my opinion. A bold statement as I'm a 73 KZ Z-1 900 owner.

Goodaye Ken,

Sounds like you should investigate the wonderful engine upgrade products Messrs Yoshimura and Moriwaki have on offer for your classic 73 Kawasaki :-). And I dont mean the exhaust only. Once you start with their internal engine upgrades you will end up doing things you never dreamed of, like putting in bigger diameter axles front and back, replacing your swing arm for a braced one and increasing the diameter of the swing arm pin and bushings/bearings, fork bace, air caps for the forks. Twin front rotors drilled and petaled with 4 spot brembos, aluminum spoked rims, metal braided brake hoses, oil cooler (mounted on the ducktail), remove the instruments and just have a centre mounted tacho, dont use steering dampers they makes things worse Lol. either open the throttle harder or apply light back brake only as it pulls the frame straight from the back and helps stop the tank slapper, do get very solid limited steering stops welded in, nice big wide sit up handle bars no clips ons for a mother like that. I just remembered shocks and forks. Lol. Man, then you can have the tank resprayed traditional colour but with the Yoshimura or Moriwaki name / logo on the tank!

Or you could enjoy it simply the way it was made :-) which was always exciting Lol. You had to ride them in the dry as if it was wet. Lol. cheers

Mind you the street bike I would love to be able to own is the Honda CB1100R cheers Thumbs Up Beers

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Post  Ken Cook Sun Dec 26, 2021 6:33 am

I just had the tank and side covers painted. I didn't do the traditional colors but this paint is amazing. My bike is a drag bike and it has a 10' wheelie bar out the back. I have driven it on the street but it's very difficult to do so. I did see the exhaust you mentioned. Currently, it sucked a intake valve and is waiting to see what happened. My neighbor across the street was complaining one day when I started it. I rolled it out and did a huge burnout directly in front of her house for what seemed to be forever. The 4 in 1 megaphone header was just putting out a unforgettable note.
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Post  getback Sun Dec 26, 2021 7:52 am

I rolled it out and did a huge burnout directly in front of her house for what seemed to be forever. The 4 in 1 megaphone header was just putting out a unforgettable note. wrote:
lol! lol! Alot of that goes on here in the country ! Black marks in the road Load ass bikes and cars ! Heck I was mowing some years ago and there was a car coming down the road (I was out front mowing) and noticed it going pretty slow as the limit is 45 and 55 right down the road ,, well iit turns out he was headed to the dragstrip a few miles away . Helmet and all sounded like he was in 2-3 rd gear LOL
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