have REAL power loss now!

Well, while trying to trouble shoot and find out why I have a loss of power since changing carburetors, I now have a serious loss of power. I got a recommendation from a post about a replacement plug and I went to the local NAPA and got it yesterday. I road it around a little bit then put it up. This morning I got my bike out and went about 300 feet and the spark plug blew through the top of the head!

Don't know what the extent of the damage is.... don't even want to think about that at the moment (smile). But I am wondering what it is. Am I going to need a new engine?... a new head? I don't know much about these little engines. Just enough to get into trouble.

well..... I just wanted to "share" my morning with you all. Thanks for listening and I would appreciate any help in how much damage I might have done.

thanks,
cd

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70cc HT
Moon Dog
crabdance@gmail.com

You might be lucky and just need to have a helicoil insert put into the head. You might be even luckier and get away with just rescrewing the plug in.

I had a humber throw number 1 plug once - you should have heard the racket. its an alloy head engine and it just screwed back in no problem.

Its more likely that you'll have problems if you had the throttle wide open because the more power the more pressure.

Hope your engine is ok... if not you will probably be looking at a new head, assuming the plug itself hasnt broken inside the engine.. which could make for more expensive problems.

Jemma xx

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Well... I caught this one before anyone replied and I can tell you all how dumb I am . Here's what the problem was; I did not tighten the plug enough and it vibrated loose and shot out once it was loose enough. I just put the plug back in (tighter this time) and took it out for a test drive and it drives great. I didn't blow the engine or anything like that at all.

thanks for listening,
cd

__________________
70cc HT
Moon Dog
crabdance@gmail.com

So it was your plug then that was faulty to begin with? Was it your original China plug?

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70cc HT
Moon Dog
crabdance@gmail.com

No the plug was not faulty... it was pilot error. I only hand tightened it at the auto parts place and never got around to giving it that extra twist to hold it good. It was not the original plug. I was trying to use a replacement to see it that helped with the power loss.

As far as the power loss goes... I'm beginning to think that it's just the carburetor and that's how it runs. I will try and get a new one when I save up the money and see how it goes. The good news is that I'm getting better at working on my bike! yea!

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70cc HT
Moon Dog
crabdance@gmail.com

Forget about the spark plug thing. Lesson learned.

Let's get to the meat of the issue.

Engine starts easy?
Engine warms up nominally?
Bike has no low end power?
You wick it on and what happens?
Bike has no top end power?

Old Plug was black? After how long?

Your needle e-clip is where?

My guess right now is that you are running too rich, but that's just a guess. Need more info.

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I noticed that another guy having the same problem found out that the supply fitting on the carburetor was restricted and gas wasn't flowing into the bowl quickly enough he thought. Check yours and let us know. Maybe it's a common problem for these. Thanks, Scott

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engine starts easy
warms up great
has no low end power (or high end if I hit a hill)
new plug turned black after one day (could I be too heavy on the oil?)
e-clip is on the second level from the top (stock)

Thanks for asking, Pablo. I would really appreciate anything you could do to help this poor carburetor get some guts in it. It has about half the power that my last one had.

thanks,
cd

__________________
70cc HT
Moon Dog
crabdance@gmail.com

I just tried putting the e-clip on the 3rd setting and other than making the engine sound a little different the power symptoms are still the same. Any ideas?