Ohh I’m kind of exited Japanese 2 stroke??

Thepaetsguy

Thepaetsguy

Well-Known Member
#101
#101
On eBay there was a Briggs intake that someone had aluminum welded a Mac read cage on. So it bolted to a Briggs 5hp intake port the reed cage was bolted into the intake and the tillotson HR carburetor was bolted to the reed cage.

It was a total cost of $15 for the whole deal on eBay. And I missed it and don’t even have a picture of it. It’s exactly what I need to retro a reed cage on this 50cc generator engine.

It would be costly to make my own cage so missing out on the $15 homemade one is a bummer. I did not need it for a Briggs and didn’t have this engine yet. One off parts I didn’t know I would have a direct use for.
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#103
#103
sparkwizard said:
Without reed valves or a proper exhaust system, it might not idle as low as you prefer.
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Thank you!!! This exact post took me back to banging my head off a wall trying to get my cr80r to run right. Would rev out smooth just would not idle.

A few people my dad know came and put a silencer on it and a reed cage and that thing ran perfect for years after that.

it’s a generator engine. It’s not going to idle I don’t think.

I’m gonna try making a reed cage for a tillotson HL
 
sparkwizard

sparkwizard

#104
#104
I concur, it is piston port.
Since it is so old, I would try to avoid taking it apart more than necessary. I would turn the idle up until it stays running. It has a manual clutch, so engagement should not be an issue. Run 30 ND oil at 16:1 and hope that the seals swell and it gets better.

Did you install a gasket under the cylinder when you put it back on?
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#106
#106
Harquebus said:
Where's the VIDEO, man? I want to see and hear it running and so does everyone else. ;)
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I’m putting the slide carb back on today and I’ll try whacking up the idle screw like sparkwizard suggested.

Right now I have a few minute long videos but it’s just me blipping the throttle to keep it running.

It was probably 1AM I went out and made gaskets for the top and sides of the transmission and filled it full of tractor grease and a hint of gear oil. So it’s ready to be driven off the chain without running completely dry.

I‘ll definitely get a running video up just a few more details to iron out.
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#107
#107
This intake gasket is probably original and no good. I made my own gasket and hit it with some copper spray in hopes that if there was a leak there isn’t now.

I have an expansion chamber from a 50cc china engine I’m trying to retrofit now but it’s chrome and ugly looking. If it helps it run any better I guess it will work.

Last but not least I will pull the flywheel and slowly start advancing the timing. IMG_3215.jpeg IMG_3217.jpeg
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#109
#109
sparkwizard said:
Did you install a gasket under the cylinder when you put it back on?
Click to expand...
I made my own gasket for the jug to the engine case. I used the engines STOCK copper gasket from the cylinder head to the jug.

I mentioned earlier I don’t notice it puffing anywhere like a head gasket leak. With how heavy I’m mixing oil in the fuel if there was a blown out or leaking gasket I figured it would show itself pretty easy. It’s all well soaked in oil internally.
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#110
#110
It will fire up run a few seconds shut off. Like the idle circuit is plugged or the seals leak. I have a Clinton carburetor I have been through twice it will not rev up or idle.

It did rev up with the slide carb but would still not idle.

I Got a few things left to try If they don‘t work I think it’s pretty much a display and you can still at least prime it and show people it fires.

Maybe pull it back apart and try to retrofit some seals on each end?
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#111
#111
Picture #1 it’s a crime how cheap this was successfully done. The Amish are cutting it up and taking it free. I will get back to the engine once I get my yard back.

Picture #2 is something I noticed. I removed the bowl on this carburetor after just removing it from the engine. I bet if the idle screw was present like it was supposed to be it would idle. IMG_3342.jpeg IMG_3373.jpeg
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#114
#114
I explained this once but someone removed the engine from the generator leaving the end of the crankshaft completely unsupported. So they CUSTOM made the bearing plate to support the crankshaft in picture #3

THEN they milled the end of the crankshaft for threads and a key way to add a sprocket. This was a lot of custom work.

ANYONE can go to Nippon classic de website and see pictures of the first Honda. Look at the cylinder head and the primer screwed into the cylinder head. They broke the primer lever. Mine is not broke.

Whoever did this had access to engines very much related to the engines in the first Hondas. They had access to make the custom front bearing plate. The gearbox etc… It burns me up nothing on the moped or bicycle or farm equipment it powered exists…. You know I’m half waiting for someone to finally connect this to one of Hondas bikes. Or one of his direct competitors.
Edit: The bike on Nippon classic de appears to have a broken cylinder head primer lever. HOWEVER the bike on the autopian does not appear to be broke?? Two different bikes? IMG_3465.jpeg IMG_3466.jpeg IMG_2957.jpeg IMG_3176.png IMG_3177.jpeg IMG_3233.png
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#115
#115
The seals may have swelled up and I am mixing the oil heavier that’s helping a lot.

It will run well. But the throttle needs to be open slightly more than the idle screw can account for. Idle screw tightened fully but still no idle. Open the throttle the smallest bit and it WILL idle. So tomorrow I will drop the idle jet a bit less fuel through the idle jet a bit less air needed I can start backing off the idle screw.
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#116
#116
Again very similar to Honda 50cc engines but not exact to any identifiable ones he used himself. The fuel primer in the cylinder head of my engine and the cylinder head of another Honda from 1947 match this fuel tank outlet on yet another Honda. The primer also being used in military generator engines. What Honda used when he had no money.



IMG_3495.png IMG_3177.jpeg
 
Thepaetsguy

Thepaetsguy

Well-Known Member
#119
#119
sparkwizard said:
That sounds great! I assume the clutch works and the trans shifts...
Can you post a picture of the exhaust port with the pipe removed? I may have an old mower muffler or saw muffler that will fit it.
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The transmission was 99% complete in that it is only missing the oil fill plug and one single clutch spring. It was disassembled cleaned and put back together with a mix of grease/tractor transmission oil.

It shifts smooth as glass and works flawless. I cannot wait to get this all inside a mini bike frame powered off the two speed transmission.

The exhaust port and exhaust pipe spacing on this engine is HUGE. I have a few expansion chambers but they were not even close. I’m thinking about a Maytag exhaust from ebay or something real artsy looking.
 
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