Sputters but no start.

Jixz

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Feb 19, 2008
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I have a kings 80 cc motor and the rest of the kit is Boy go fast.. I cant seem to get this thing up and running. Im getting a spark from the spark plug, ive used two different carbs. ( both getting fuel ok ), and ive tried the carb lever at almost every position. The best i can get it to do is sputter a bit .. but never any more than two consecutive cycles. I have no clue what could be wrong.. i dont even have the kill switch in.
 
same prob

I've been having the same problem. It started when I made a bad mix of gas using gas that had been sitting around a while. Slowly the engine weakened, but now that I have put in fresh gas, cleaned out the carb, checked for a spark, etc., the motor just won't run. I get hiccups of the engine firing every few seconds, but I cannot get it to get up and running no matter how much I mess with the engine. I have pedaled the bike for a mile with this intermittent firing but it just doesn't start running on its own. Any help or suggestions would be greatly appreciated.
 
OK, silly things first...do you have good connections between motor and CDI?
Get rid of the kill switch.
Make sure the fuel petcock is on (pointing in the same direction as the fuel line.
Press the button on the carb to let the fuel in.
Pull the choke all the way up.
Do not give it gas while the choke is on.
Once it fires up, pull in the clutch and stop moving....close the choke all the way...let the motor warm up before you start revving it up.
Take the idle screw, turn it all the way in (just until it stops - NOT TIGHT) then back it out 4 full turns. Out further slows down the idle, in speeds it up.

I know you checked the spark, and have fresh gas...that just leaves compression - which I'm assuming is there, and air/fuel mix. I don't know how the air is in Oregon, but maybe some of the guys from out West can tell you where the e-clip on the carb needle should go.

****, look at me - computer guy trying to help someone get a motor running! Who'd thunk that would ever happen??? :)

Good luck, and keep up posted...what I listed are what I think "basic" things for troubleshooting.
 
Check the adjustment on your clutch to make sure the engine is engaging. Sometimes it might seem like it is, but it is just slipping and catching every few revolutions, not enough to draw air and gas in the carby...
 
I have a kings 80 cc motor and the rest of the kit is Boy go fast.. I cant seem to get this thing up and running. Im getting a spark from the spark plug, ive used two different carbs. ( both getting fuel ok ), and ive tried the carb lever at almost every position. The best i can get it to do is sputter a bit .. but never any more than two consecutive cycles. I have no clue what could be wrong.. i dont even have the kill switch in.

If you have A good strong spark ,Plug is good .Gas/ oil mixture Fresh and correct.
Good compression and nothing blocking both air and exhaust then motor should run.How's the plug look after you try starting it.?

Bob

BlueCollarBikes@gmail.com
 
ok, spark plug is good, ive changed out the gas with a new tank of 16:1 ratio, the carby seems to have gas in its bowl, chains tight (not too tight), kill switch isn't even there, clutch seems to be ok ( tell me how to check for sure ).

The only thing i can possibly see wrong with anything here is the fact that its a different CDI, Exhaust, and Carb.. Tell me if that matters?
 
Too much oil maybe? I'm running like 35:1 synthetic. Maybe add a bit more gas to the mix and see how it goes if all else fails? I think you should break in at 20:1, right? This is about my limit of usable knowledge, the rest if just guessing! :)
 
If you can hold in the clutch, pedal and coast, you're good with the clutch. It should turn over the motor when the clutch is released. If it slips while released and doesn't always turn over the motor, then maybe the clutch is not tight enough. Mine just works, right out of the box...it chirps while I'm riding, but I don't think it's slipping.
 
ok, spark plug is good, ive changed out the gas with a new tank of 16:1 ratio, the carby seems to have gas in its bowl, chains tight (not too tight), kill switch isn't even there, clutch seems to be ok ( tell me how to check for sure ).

The only thing i can possibly see wrong with anything here is the fact that its a different CDI, Exhaust, and Carb.. Tell me if that matters?

What do u meen diff CDI, Exhaust and Carb?
 
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