s65, that is an oldie. I have a book from 1967 (Honda Motor Cycles by Graham Forsdyke) which states that the s65 was introduced in 1964.
quote: The s65 was introduced because the 50cc bikes were not allowed on the britisch motorways. It was alos the first "50" with ohc instead of pushrods.

 

An interesting site...
Honda Sport 65, S65, CS65 Motorcycles

 

Back in the early 70's I had one,still have the engine which now lives in ct cases, serial # S65E 112803. They and the s50 were the first of their ohc horizontal engines. Sometimes you can find the official Honda shop manual on ebay, IMOH one of the best ever manuals for any little Honda. The engine is very similar to the 50's and 70's but with a few detail differences,different cylinder head with piston to match,oil pump that has an oil jet to add extra oil to the primary gears and an oil feed to warm the carb. Early models were recalled to change gear box due to weak gears,which mine above had done. They put out somewhere near 6.25 hp at an incredible if I remember right 9K rpm.

 

Great bikes.
I have an ongoing project with a 1965 s65.
Probably the funnest bike I've ever had.
Im currently working on a front end swap with disc brake.

 

Thanks for the replies guys. Ive since torn apart the bike and have been collecting all the parts I need to get things thing looking great again. Somehow along the way I picked up a project S90..

Anyway here is a video of my latest progress. Thanks for watching!

youtube.com/watch?v=hAE1urpkL98


Sorry I couldnt properly link the video, you have to copy/paste. My post count isnt high enough to post a link aparently, but it let me do it my first post.

 

Great bikes.
I have an ongoing project with a 1965 s65.
Probably the funnest bike I've ever had.
Im currently working on a front end swap with disc brake.

View attachment 200658

Nice i didnt notice the Piranha engine swap at first! Looks great. Im trying to keep the s65 original, but im putting a piranha in my S90 project. What kind of shocks are those?

 

Thanks.
I bought the shocks in Japan from a shop that no longer exists.
Ive had them a few years and have forgotten the maker. The OEM shocks are SO soft and springy that I had to get something firmer like these.

Post a thread for the s90 project too. Id love to see how it goes.

If you need any OEM s65 parts I have some Im selling. Let me know what you might need.

 

If you need any OEM s65 parts I have some Im selling. Let me know what you might need.

I think the only part I am missing is the front fender, do you have one of those?

 

I do have one. Black.

 

 

Hi,

I know its not a new thread but a have few questions about the S65.I also bought this bike,its a 65'.
I would like to know if there is interchangeable parts with other mini honda. I'm having hard time to find a rebuild front fork kit.There is a lot of kit for other mini but never for the S65

I need an ignition switch and the fork lock....again the same problem,is there another one that could fit?
Where could i buy all the rubber things,beside ebay?
I would like to buy a motor rebuild kit(cylinder,head,piston)
Which one is the best?

My S65 is blue with the fuel tank off white,anyone have ever saw this color combination before?
Its seem to be the stock color.

Thanks

Bert

 

Some of the fork bushings from a c70 will work. Some parts are going to be harder to get. I had someone 3D print some of them. This is one of the reasons I went with a fork swap on my s65 so i didn't have to search for hard to find parts only to end up with a crap front brake and very little suspension.

The ct70 ignition switch works perfect. I have one on my s65.

Not sure on your other questions.

 

What suspension did you installed?

Bert

 

Shortened KLX140 forks.

 

The Honda Identification Book says they were sold here in the US from 1965 to 1969 and came in White,Black,and Scarlet Red

 

For the US maybe,but i'm from Canada.All the US model that i saw don't have turn signals also,but i have turn signals on mine.It's pretty tough to find new turn signal lens.


Bert

 

I have heard of blue ones in Canada.

 

Ive always liked these bigger Honda bikes. Too bad they didnt sell them in Northern Europe and only chinese clone has been the skyteam ace. But now there are these cafe racer 50cc bikes that could go on the category:

They sell them at different names.

I mean swapping the engine is quite a bolt-on, right? but how about suspension, forks and brake improvements since this is not a straight copy of anything? Everything has to be custom made or do those chinese use some kind of standard measurement for example for the rear shocks? Seems to me that it would be the first place to start modding.

 

What do you guys think of the inline oil filter by Aeroflow(i can't post a link)

I don't like the idea of removing the clutch cover each time i want to change the screen.It would not be that hard to intall because of the oil lines already in place...

your thought....please

bert

 

Its not needed to clean the screen often. Like almost never.

 

I want to buy a cylinder head for my S65.I saw a lot of heads on ebay,any link for one that will fit!?

Thanks

 

If your only buying the head you'll be out of luck- a S65 uses it's own head.Let me see if I can find a pic.

 

Sorry for the bad pic- See on the 70 head to cylinder in this pic just above the valve is a bevel

Here is a s65 head no bevel

Here are a 70 piston on the left 65 on the right - the piston pin here is pushed thru both so you can see the 65 protrudes into the head compared to the 70. Don't see why you could not use a complete 70 or big bore setup with a new head but you would have to drill and tap the carburetor oil line

 

Someone have ever done the tap and drill?

Bert

 

Just get a different motor. The 65 motor isn't worth it.

 

Why? Whats wrong with them?

 

Its gutless. Unless its a real clean show bike I see little reason to keep that tiny motor. Especially if its got issues.
Crate motors are very cheap, reliable and fun IMO.

 

I don't want a bigger motor.I like it the way it is.If i want to go faster i'll take my other bike....cb750 1974,now 836cc!

 

Im guessing you haven't ridden it with the 65 motor.

 

I think I may have a nos s65 head at home. I'm unfamiliar with the S65 but I could post up some pics, if you can confirm it is correct. I bought it thinking it was for a CT70 or similar.
Anyway, it's a bare head casting, new old stock without packaging. I think I paid 80-$100. I'd like to see it go to a proper bike.
I'd be happy with $80 shipped to the lower 48.

 

I think I may have a nos s65 head at home. I'm unfamiliar with the S65 but I could post up some pics, if you can confirm it is correct. I bought it thinking it was for a CT70 or similar.
Anyway, it's a bare head casting, new old stock without packaging.

Post up some pictures kirrbby I can compare it to the one I have shown in the pictures above,only difference is I have the original box,paid about the same.

 

BTW, what's wrong with your original head? Maybe it's repair/rebuildable.

 

Yes!!
Check if its a s65 head please.
And if you could check shipping cost with USPS,my postal code Is J0J 2G0.
Thanks!
Bert