why wont it start?

[rugabugadouglas]

i have a 79 110 and its getting fuel and good spark but wont fire tried 3 diffrent carbs and nothing? i checked the timing and i think its good. i put the flywheel on the t and put the dot on the sprocket on the line and still nothing? does anyone have a pic of a 79 or 80 110 flywheel? i think mine is new or aftermarket cause it looks fairly new it also has 3 lines havent tried any of those yet. what is the o (i think) for? what would the 3rd non marked line be for? it ran before i touched it and put new rings in it should i check for compression? it seems to have it when i pull it over?:wondering

[bigreddaddy]

Have you checked the air filter? Is the carb flooding? When was the last time it was running?

[rugabugadouglas]

it ran before i tore it apart kinda ruff but i tried diffrent carbs for 110s no air cleaner and the carb isnt running out of the overflow tubes

[TravEX]

Try a new spark plug. That has saved me sometimes from chasing other possible issues.

[3 weelin geezer]

How about the kill switch? I had to replace mine and off is on /on is off. Someone must have been drunk at the switch factory that day. :beer :lol:

[traxxasx]

Try a new spark plug. That has saved me sometimes from chasing other possible issues.


How about the kill switch? I had to replace mine and off is on /on is off. Someone must have been drunk at the switch factory that day.


Both wrong, read his post he said he gets great spark, he cant get good spark with a bad plug, he cant get good sprak with a bad on/off switch. Im guessing since you said it worked *Edited**Edited* u took it apart its your timing. ALSO try to put some fuel into the cylender threw the plug hole and see if it even fires, if it does check for air leak, if not check your timing. Did you take the whole engine apart?

[rugabugadouglas]

took whole engine apart i sprayed fuel in cylendar and it will pop but not fire had it running for a little when i got done building the motor but now it wont start at all

[TravEX]

I've had spark before, but not enough to fire it up. A new spark plug is a simple thing to try. And, he said he already checked the timing.

[bigreddaddy]

Well if you aren't running it with an air box and filter I would at least try it with one on.

[3 weelin geezer]

How's the compression or did he already check that?

[traxxasx]

Well he wasent sure on the timing, and a pop sounda like timing issues to me.

[rugabugadouglas]

heres some pic of what i have. i read somewhere that the points are suppost to get a gap when it reaches the "o" but mine doesnt have a "o" they start to gap before they get to the t though is that right? it seems to have good compression i dont have a guage but i put my finger over it and felt pressure didnt blow my finger off though but it has more than another 110 motor i have laying around so look at the pic and let me know it also has a new ngk plug in it and it is a big bright spark

[rugabugadouglas]

also whats the 2 other lines and the "f" for?

[rugabugadouglas]

i tried finding some stuff on the flywheel in my boook and shows nothing like what i have

[Erics350x]

pull the spark plug and stick a screwdriver in the hole to see if the pistons all the way up with the timing marks set.

[rugabugadouglas]

i looked down it and i think its all the way up i might check again? sould i pull the head and see what tdc is on the fly wheel?

[rugabugadouglas]

any other good ideas before the big holiday weekend?

[3 weelin geezer]

Here is a pic of my manual:

http://i58.photobucket.com/albums/g257/3_weelin_geezer/DSC02254.jpg

http://i58.photobucket.com/albums/g257/3_weelin_geezer/DSC02253.jpg

[rugabugadouglas]

thanks ill have to look at it more i got it running i spun where the points are mounted a little at a time and it started still runs alittle ruff but its a start! when i put it in gear it wants to die on me but i might put the stock carb on it and see if it helps and ill adjust the points more what book is that? it doesnt show that in my haynes manual i have. aloso i think i need to adjust the timing chain might be too tight it whines alittle but not bad im so happy i got to ride it for the first time tonight!!! i wish i had more time to mess with it hopefully i have time inbetween the 7 christmas i have this weekend to work on it

[rugabugadouglas]

MERRY CHRISTMAS TO ALL and thanks for the help thats my best present yet!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[rugabugadouglas]

ill be damed it is in my manual guess i was too excited to look close at it

[TravEX]

Congrats on getting it going!

Merry CHRISTmas!

[dirtybiker71]

The "T" mark shows where top dead center is. The "F" mark shows where the plug actually fires. On internal combustion engines the spark actually fires ("F") a few degrees of rotation BEFORE the piston reaches top dead center ("T"). This is because it actually takes the fuel some time to burn, so the timing is set such that combustion starts before the piston it at the top. Your points should JUST open at the "F" mark NOT the "T" mark. Also, the "O" mark you are talking about is the one on the cam sprocket. It should point to the marker when the "T" mark is lined up with its pointer. Make sure that these marks line up correctly so your valve timing is right. (Piston at top dead center, both valves closed.) As you know, the ignition timing is affected by this as well since the points assembly is located and driven off of the camshaft. And by the way, I have seen plugs that will fire outside of the cylinder (hanging off of the plug wire) but won't fire under compression. It's harder for the spark to jump the air gap in that environment (under pressure). Your new plug is probably fine, but it's not that uncommon for a fuel fouled plug to fire outside the cylinder, but not in it. Hope this helps.

[3 weelin geezer]

Mine was dying on the trail and everything seemed all right. It turned out the spark plug had only around 5 k ohms and the new one around 27 k. I figgered it was burned up inside or something. It works now with the new plug. I guess that resistor or the spring inside were burned up and wouldn't make contact when the plug was upright.