1984 Honda Gyro Build

[zuphilius]

Okay, finally got my parts for the carb. Put that together, then had a good old time getting the carb throat into the airbox tube, which on a Gyro is in the airbox. Then made my oiler cable and attached (probably 1-2MM too long, but I had enough threads to adjust it), put my new gaskets on the petcock, which didn't work. I just need a new petcock, this one is leaking bad through the on-off valve. I'll have to wait until my newly listed Legos sell to get one.

Anyways, new gas, oil, oiler bled, everything hooked up, moment of truth, after cranking a few times, she fires right up!! Lots of white smoke (?), adjusted the idle. Only ran it for about 30 seconds. It's a pain to get to the air mixture and idle screws. I'm gonna pull the right wheel to do some adjusting. Happy it runs, now gonna wait for the petcock to get this going the correct way. Might play with the petcock gaskets to see if I can get it to stop leaking.

I now have everything to put this together, except the petcock, time to park it to the side until I can get that. White smoke an issue? Or is it just cleaning itself out? Not gonna rev this up until I figure that out.

Anyways, WOOT!

[fightingplankton]

glad to hear you've got it running.
i have an extra working petcock...but from what i understand, the gyro's is a very different animal than that of the spree's(which is what i've got).

[mini_man]

I noticed that the air cooling shroud is missing off you cylinder head.

If you look at the parts diagram, you'll see that there is an air scoop that picks up air, runs it through the fan, and then the air is forced over the cylinder.

I've been running a nn50md for 15 years, and I recently tore it down for a ring job. The piston and lower end were fine. I think the cooling system is critical, because of the rear mounted cylinder.

I would work on finding the missing sheet metal!

[zuphilius]

I have all the shrouds and the plastic rear fender. They are just not in the photo. This scooter is probably 99.9% complete!

Just ordered the petcock from my local Honda dealer.

[mini_man]

Lots of white smoke (?)

That's a bunch of oil sitting in crank. It will blow out after a good run!

(we know it ain't water!)

After it blows out, it will burn clean. The question I have, is if it returns after sitting for a week or two.... If it does, welcome to my world. Mine has always done it!

BTW, I just got done troubleshooting my carb. My auto bypass fuel enricher failed. Found one on ebay (knock off) for $30. Ran better, but still not right. Found the idle jet clogged. The carb has got to be perfect, or it will run crappy.

I also found the lower ring collapsed on its groove. Darn thing was stuck, and I broke it removing it. Thank goodness Honda still has rings, circlips, and the gasket kit. The piston fit in the bore perfectly. I honed the bore, and had to carefully clean the ring grooves to accept the new rings. Once they floated nicely, we we're good to go.

After my troubleshooting of the carb last night, its the best it's run in years. Very strong off the line, and does 33-34 mph on flat land.

[zuphilius]

That's what I'm hoping for. 30MPH.

[bradthreee]

30MPH is very likely out of a good running Gyro. My 85 goes betwwen the 30 and 35 mark on the Speedo.

Your stuff shipped yesterday morning so keep an eye out for it.

[zuphilius]

Thank you Mr. 3.

[zuphilius]

Back on track, in a few days . I got my Petcock today.



Funny how the OEM ones have the lever cover screwed on instead of being riveted.

But now I have to go to Richland and Moses Lake for work the next two days so I won't be able to work on it. But work pays the bills. And so does selling Legos on Ebay! Here's a couple samples:





Anyways, I'm off to work in a couple hours, so I'll update this weekend.

[sanjuro]

Ah, nothing like the smell of fresh OEM parts in the morning.

[zuphilius]

Okay, it moves. 32MPH indicated and I ran out of street.

It blows a bit of blue out the back at full throttle, anything I can do about it?

Here's some pics:







For a 50, when it hits 2nd, it gets up and goes!

[martynkim]

Too bad I didn't know that petcock looks identical to an Express petcock. Of which I have a few.

[mousewheels]

Very nice
It looks sharp everywhere & you have the little cover over the carb on the engine cover. Kind of a collector thing, a guy could make a cover... but you have the OEM part. As a whole, one very nice NN50 - great work getting back to near day 1. Have a great summer with it, you have a head turner!

-- mousewheels

[sanjuro]

That's such a nice example of a gyro. A month ago I had to pass on a blue one that was 3 hours away. I'm still kicking myself for that one.

[zuphilius]

Thanks for the compliments!

Man this thing is fun to ride! I kept thinking it's gonna be a real dog off the line, but it hauls my 240# down the road at a pretty quick for 50cc pace. It really scoots when it shifts to 2nd!! I can get it up to 20MPH in the length of a block from a dead stop.

@Sanjuro: You gotta get one of these! I've got about $300 in this including purchase price.

@MartynKim: No worries, I'm just glad it's all back together!!

The front covers for the handlebars are not shown in the pics, I forgot to put them on. 99% complete. I just need the rear bumper/valance, mine is cracked bad. I'm sure I'll be looking forever...