how do you foul a plug in 30 minutes?

[PureMetalKorey]

for all of you reading my last thread, i've had a heck of a time getting my 83 trimoto 175 running right, i replaced the plug and put a fresh tank of gas with a good mixture in and it seemed to be running fine. I rode it for about 30 minutes and put it back in my buddy's garage, went and picked it up today and went to start it and....NOTHING.
same thing as before, it would run off of a shot of starter fluid then die. so i took the plug out to take a look at it, and it was just as black as the last one i took out. so how do you foul out a plug in 30 minutes of riding, and what would cause it?

[cr480r]

Poor jetting

[SYKO]

well.... my old air fooler 300 fouled plugs after about 30-50 mins of riding, even solid on the gas riding, and the plug wasnt all sooted up either, what may have been the problem is that half my piston was missin! You can do a search to find out more about my poor air fooler. Really every 30-50 mins of rid time would equal a fouled plug, and I fooled with the jetting and had it spotless.

[PureMetalKorey]

yeah, i just put a brand new piston in there, i'm afraid it might be a mechanical problem. hope i don't blow another piston.

[NINJA]

Sounds like what is going on is a jetting issue for sure. Your plug is getting carbon fouled while you ride. The engine continues to run because you have a stronger spark at higher rpms. When you shut the motor off and try to restart it the next day it won't start because you can't kick it over fast enough to generate a hot enough spark to burn through the carbon on the electrode.

[PureMetalKorey]

what would you all suggest i do? would moving my needle up or down help any?

[pickleweasel_00]

Try this out :D

http://www.3wheelerworldforums.com/showthread.php?t=55086&highlight=carb+jetting

[cr480r]

Is the air filter dirty? Any rat nests hiding in the air intake? Does your bike have a oil injection system? or do you pre-mix your fuel? Does the choke shut off properly?

[PureMetalKorey]

new air filter, no rat nests, oil injection system is blocked off, i premix 40:1 chock is broken so the plunger is just in there engaged all the way.
i heard if you've recently bored out an engine that it's common to go through lots and lots of spark plugs at first?

[Billy Golightly]

Not really. If the airfilter is clean, the carb is internally clean (IE, no orifices or jets are clogged), and the pipe isn't full of trash, then your gonna have to look at your carb jetting (Check the sticky) and if you can't get it after tuning the carb your looking at a possible crank seal (Are you losing trans fluid too?)

[XL-erate]

Could it be your ring expanders? There's various types requiring correct installation and if you happen to get it wrong it causes problems. Also ring gaps have to be staggered around bore. Reason I ask is I recently followed my normal install method on expanders only to find out the particular engine was an exception to the rule, naturally.....

Here's one Wiseco example, but may be different from yours:

http://www.wiseco.com/PDFs/Manuals/TabbedOilRail.pdf

[TeamGeek6]

Verify the fuel level in the carb before wasting weeks on jetting. I screwed with my PJ for months till I figured out the float needle was leaking.

[DeePa]

does this trike have oil injection?

[PureMetalKorey]

if these particular oil rings are required would they be in the box with the new piston? i think i compared pistons and they were identicle i made sure i read directions a few times before i installed it.

DeePa, yes i have oil injection but i have disconnected and blocked the fittings and i premix my fuel.

[InPiEcEs]

Most 2 stroke pistons have 2 rings, both compression rings. Some only had one ring.
You might check your float level, and take a good look at your inlet needle as TeamGeek6 said. If your float is set too high it will cause the engine to run rich, even though the jetting is right. Check those 2 things before condemning the jetting.
Another thing.....be absolutely sure that the choke is not letting fuel into the engine, and remember that the choke plunger seal can go bad, too.
Also......how is the compression?

[Erics350x]

If its running rich why would he need starting fluid to get it started?

Take the carb apart, clean the jets, adjust the float, get a new plug and gap it, also make sure you are running a good quality two-stroke oil.

The only reason most two-stokes go through alot of plugs during break-in is that most people run a thicker premix during the first tank or so.

[PureMetalKorey]

the carb has been taken apart many times but i double check on the float should be done anyways. it's not a big thing to take the carb out and pop the float bowl off.

i think that it could potentially be getting TOO much fuel and almost be getting flooded? the plug was wet looking, maybe it has something to do with the choke, as another member had suggested, is it possible by the choke not being seated all the way flood it?

right now i'm using a 40:1 mix with golden spectrum 2 stroke oil, i guess it's good stuff from what i've been told.

[Billy Golightly]

It sounds like you've checked and covered most everything (Except for the crank seal possibility I mentioned earlier, is your transmission oil getting lower?) and its time to just go ahead and lean out the carb with some jetting adjustments. Oil has little to do with how dark the plug can be. You can jet appropriately and get a brown or even white spark plug with a mix ratio of about 8:1 even if you were so inclined (I don't reccomend it). Your current oil/fuel mixture is fine, thats not the problem.

[PureMetalKorey]

actually i'm not sure about the transmission fluid, where do i put it in and how much should be in there? it had been sitting for quite a while and no leaks what so ever. i mean, since i bored it out there could be a chance that i might have to just adjust the needle or jets to this new piston right?

[MTS]

Sounds like the needle/seat are leaking,,, You pressure test them? its not uncommon, especially on something that vibrates as much as a tri-moto 175..