shamg

This is my number one suspicion, I recently just rebuilt the top end as well so I feel foolish for not checking them then but it's all a lesson I suppose.

I don't think I'll have to bump the bike any time soon (even in reverse)... it has a kickstart

Good call on the ignition timing, i will check it out. Any suggestions welcome

Hello I was just wondering what could cause carb blow back on a 2 stroke. I’ve an old TS100 I’m trying to start and every so often the kick is accompanied by a blast of air from out the carb and white smoke (with a slight burning smell and slight bang as tho the bike is trying to fire). The bike currently has no air filter due to the lack of a rubber hose connecting the box and carb. I’m thinking the issue could possibly be the reed valves or just a bad fuel/air ratio?

Could it possibly be due to there being no battery? Would the ignition system need a battery to spark?

Doesn’t seem to have worked, tho the plug is quite old I think.

Hello, I’ve been trying to get an old ts100 to start and I have no spark. To begin with, I tested the spark plug by holding it on the cylinder head and I had spark, so I was trying to start it by pouring fuel into the cylinder and kicking it. However, after doing this for a while (to no avail) I’ve tested the spark again and it’s not sparking. Any ideas what could’ve happened? I should also add there is no battery hooked up if that makes a difference. Thanks

I will have to pinch the battery off my xlr and give it a go, but the loom on this bike is in sorry state

This bike definitely has the slot for a battery, and also has a regulator rectifier. So this means it’s not a DR125 but a SP, which means it requires a battery? It has run without a battery before but this may be what caused the HT lead to go bad in the first place. I also noticed it has the mikuni carb found on the GS125 whereas usually the DR usually has a teikei carb as standard.

Okay, I had a battery previously and hooked it up and all was fine, I would turn on the ignition and the dash would light up, lights work etc. Then upon starting the bike however, all lights and electrics seemed like they were running off the engine, and not the battery (lights would fade and brighten slightly with the rev of the engine). After restarting the bike, it would run as though there was no battery attached at all. Could this be due to a bad regulator?

Thank you for your replies, I will invest in a spark tester There is no battery currently attached to the bike, shouldn’t need one to run tho should it?

It’s coming back slightly wet with what smells like fuel, not oil

Seems to have done the same thing again, took off and cleaned the carb and the bike wouldn’t start. Checked the spark and there wasn’t one, swapped out the HT lead for another and it sparks now but still won’t start, just gives a loud pop/backfire every kick, but there is a small hole in the exhaust. On another note, kickstart seems to have gone slightly stiffer?

Thanks for your response, fit a new ignition coil/HT lead last night and bike fired right up.

Also, here is a picture of the stator, not entirely sure what to be looking for in terms of damage, but does it look at all melted/corroded to a point where it will no longer work?