I couldn't really make anything of it either. That plug looked like it's firing OK. I know for sure I'd pull the hose off the bottom of the carb (the bowl vent) and make sure it can breathe through that line. Mine had a fuel filter looking thing on the end of the hose that was capped at one end. I wondered if it was a desiccant type thing for shipping purposes.

Joel

 

I'll give that a try

 

Does having the choke on help or hurt the problem?

Were those plug pictures taken after a full throttle run and then killing the enigne at full throttle? If you just rode the atv and checked the plug your not checking much but how the quad is running at what ever speed you killed the engine at..

I havnt listened to the video yet...sorry.. been real busy..

 

Why would you take plug readings all the time? trying different things? or just making sure nothings going wrong? Do you check the plug after diffferent throttle positions? 1/4?, 1/2?, 3/4?, etc,...? Or always at full throttle?

Id drill thru it if it was mine..

 

The video sort of sounds like clutch rattle..but its real hard to tell..

 

Why? I'm a curious type and pulling the plug is an easy thing to do.

I do try different things and if they effect the way the fuel burns in the combustion chamber I'm reading plugs.

That depends on what I'm diagnosing. I try and reproduce the problem, run it at that RPM for a little while and kill it. Then read the plug.

The next time I have the carb off I probably will cause I'm a curious type.

I do remember the late 70s early 80s cars with capped low speed mixture screws. It was a PITA getting those cars through MD emissions testing.

I also had a 95 Suzuki LS650 with capped low speed mixture screw. Suzuki produced that bike so lean the pipe was a rainbow blue half way to the muffler. I drilled that cap to richen up the low end and put a iridium spark plug in and it felt like a different bike.

 

The guy at the local dealer said he has heard the stator making that noise before going out. Has anyone heard this before?

 

Nope

 

Your making me feel lazy nimadd.

What have you tried? Is this on your 110?

Makes sense.

If you do.. will you tell us (ME) whats under it?

I used to take the caps off, adjust the screws and put the caps back on..We did the same thing at a tune up shop I worked in in 1978..

A lot of the Chinese 200 and 250 quads had blue pipe syndrome... Im now wondering if the emissions stuff on the exhaust is plugging things up a bit and richening things up some?

 

I'll take that as a compliment MWQ.

I’ve worked on everything from 5hp Briggs & Stratton to big block V8’s and 2 stroke RC planes to chain saws to 200hp Outboard Motors. They all work the same to me. Get the right fuel mixture to the top of the piston and provide spark at the right time presto you’ve got power it’s FM (Freaking Magic). After 40 years of braking things the biggest lesson I’ve learned is if it ain’t broke don’t fix it, if it is it’s time to play.

I do things on an as needed bases so the only things I’ve done to this 110 so far is add a fuel filter, pull and clean the carb, change the spark plug and play with gaps and reform the rear brake pad keeper spring so it holds the pad in place better. Sometime this spring I want to add zerk fittings to the A arm and swing arm pivot points (if I can keep the kid off the quad that long). I’ve also been toying with the idea of putting knobbier tires on it since it’s been so wet around here my son can’t even ride the little track I made for him in the woods. He’s been ridding the road in front of the house lately and there are laws around here agents that so if any of the neighbors gets a wild hair it could cost me. I don’t know how much the fine is and don’t want to find out, I’m sure tires would be cheaper.

Other things I’ve done are mostly simple practical things. If while I’m tearing into something I see a way to make it work better I’ll try it.

The way the spark plug looks on my sons 110 I expect to have to do a little tuning when the weather warms up and the air changes from cold dense air to liter hot air. I had a VW Beetle that I had to retune every time the air changed. It was just that touchy. Of course when you put a VW Bus engine in a Beetle, add a Mallory duel point distributer, high out put coil, and Holley 2 barrel carb it’s going to run a bit touchy. Anyway that’s probably when I’ll find out what’s under that cap on the side of the carb. And after all the good advise I’ve gotten from you and the good folks here of curse I’m going to share what I find out.

The blue pipe syndrome (never herd it called that but it’s fitting) usually means hot (lean) burning. Restricting the exhaust should richen up the mix a bit because it also restricts how much air can be pulled in.

I’m very interested in finding out how Jsills78’s 110 runs with the choke on. I’d suggest even trying it at full choke (which I expect isn’t going to run at all) to half choke to quarter choke. That could give us a good idea of weather or not it is a fuel problem or as his dealer thinks weak spark from the stator going bad (although all the bad stators I’ve seen just die they don’t slowly go bad). If he wants to tare into it I think LynnEdwards knows what the readings on the coils should be.