China 80cc Longevity Kings: List your milage and key to success!

Muffler is not stock any more...

Since I did not do any Dremal grinding on manifolds, I was wondering how many other motors did or did not? "Stock" is untouched out of the box like mine. Stock muffler too!

Ughh...8 holes one quarter inch drilled in the baffles. A bit over kill and noisey but so far I like the throttle response.
 
Bob you have been an excellent resource of info since my feeble "PM" questions answered with the understanding of the learning curve for a noob.
Thanks!



Warm up go it!
1- How many miles have you gotten or have on the HT?
2- Exhaust mods for 1/2 throttle at 25 mph?
3-And taking off with the clutch? Is pedal start easier on the clutch plates for longevity? Just asking...maybe they out last the motor? (noob Q)

I hope to see some competition and bragging rights surface from the Kings.
Because I want to learn from the pros !!
Thanks from the Oregon rider with hills.



PS: Second break in ride was clocked with my wife's Prius at 15mph and 20 mph. Speedo quit working. Does the electronic ignition or Plug wire cause interference with the Cat Eye front tire speedo?

To address your speedo problems.
I use a super cheap like $6.00 speedo.
Your plug should be clean, and about 17 to 23 thousands gap.
You must use a resistor type sparkplug wire.
You must mount the speedo sender on the rear wheel as far from the cdi as possible .
And route the wire from the sender using the frame to help shield the wire from the cdi.
I also use the gas tank with a big foam mount for the speedo display.
 
I have almost 4,000 miles on my old king's 80 engine, It has always started within 10-15 feet of popping the clutch. And I broke it in with 20:1 and now I have run it with 32:1 using castrol 2t oil. I was very disciplined when breaking it in, I never once went over 15 mph or rode it for more than 15 minutes for the first 50 miles.

Oh, and I have no hills near me (except when I sneak onto golf courses)
And I haven't done anything major to the engine except put a better spark plug wire on it and an expansion chamber.
 
To address your speedo problems.
I use a super cheap like $6.00 speedo.
Your plug should be clean, and about 17 to 23 thousands gap.
You must use a resistor type sparkplug wire.
You must mount the speedo sender on the rear wheel as far from the cdi as possible .
And route the wire from the sender using the frame to help shield the wire from the cdi.
I also use the gas tank with a big foam mount for the speedo display.
I got the speedo working again had to move the front fork sensor about 2mm from spoke magnet. Now it is working perfect again. (wierd interferance is gone)

I have almost 4,000 miles on my old king's 80 engine, It has always started within 10-15 feet of popping the clutch. And I broke it in with 20:1 and now I have run it with 32:1 using castrol 2t oil. I was very disciplined when breaking it in, I never once went over 15 mph or rode it for more than 15 minutes for the first 50 miles.
Oh, and I have no hills near me (except when I sneak onto golf courses)
And I haven't done anything major to the engine except put a better spark plug wire on it and an expansion chamber.

Expansion chamber question how much did that improve speed performance and MPG? Or did you loose MPG with more throttle gunning? 4K miles is very impressive, keep her going and maybe you will be in the 6K club! Thanks for the break-in tip.
 
With the expansion chamber, I noticed a big increase in torque and take-off but no real increase in top speed. And my mpg didn't go down any.
 
3200mi and going strong on my early Kings motor. Still all the original parts. I used Quaker State 2 cycle from the word go. For those that put down this motor, and there are lot's of them on this site. Well the motor outlasted the bike! So it's now on Motoschwinn II.

You know? Me Too!!
Yes. My engine outlasted MOOP 1.
 
Reversed the exhaust mod back to almost stock.

Ughh...8 holes one quarter inch drilled in the baffles. A bit over kill and noisey but so far I like the throttle response.

I plugged the quarter inch holes except for 2 at the top baffle. All bottoms were plugged and sealed the factory spot welds. The noise would be a great reason to get a cop to pull me over. Working on rules of the road and safety lighting and gear. I have seen two patrol cars and none seem to care I was cruising in the bike lane with my bike helmet and blue trail of exhaust from break-in fuel mixture.
 
I got 1500 miles only :-( on my CH80 "no name" I purchased on eBay. Learned a LOT about engine mounts, air leaks (carburator side), tires, chains, grease (on everything), clothes to wear, clothes to not wear, bicycle tire bearings, tool kit (10 mm open end, crescent wrench, screwdriver with bit assortment, spare engine studs and bolts, spare plug, etc.), check all bolts prior to every ride of any duration, etc.

Lots of hills here, my upper bearings were trashed, happend on the flat at low speed JUST AFTER posing for pictures at a local gas station JUST AFTER mixing a tank of gas + oil in the tank.

I only ever learn by doing things wrong, sometimes a couple of times ! But thats OK.

I just got my new DAX CH80 up, that I bought at Fall prices (!) on eBay. 134 with shipping - fantastic. Roller bearings upper, but bushing lower, may be better on the bushing anyway. For this build ->

1. Fingernail polish a.k.a loctite on engine mounting bolts on engine side.
2. Double nuts on mounting bolts, 2nd one as a security feature.
3. Rubber mounts on the engine clamps (what works best is bike intertube split lengthwise about 6" long on both frame tubes).
4. Rubber mounts on gas tank, cdi mount.
5. Plumbers tape on fuel petcock threads into tank
6. Plumbers tape on top of carb where cable mounts (this can come loose and cause air leak).
7. I don't use any kill switch, had problems with the first one shorting out, couldn't start the engine and spent a lot of time figuring out why. I just dump the clutch at idle - don't know if this is good.
8. I put washers + lockwashers on some bolts that don't have them, e.g. where chain guard attaches to engine.
9. Grease front and rear bike wheels complete using a grease NEEDLE and grease gun.
10. Dab of grease on drive gears under clutch plate cover. Lithium grease doesn't appear to spread real well here.
11. Religious break in period.

After break in, I will put cardboard (or coat with silicone) on underside of clutch plate cover, as I learned on the forum, as this cuts down on gear noise. A lot of noise indicates need for grease, I had to grease the old one frequently.

My 2 cents

:)

cb
 
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