Pigsmightfly

I'd appreciate some help with engine starting problems.

Fuel is getting through (plug is wet after attempted start)

There is a good spark (2 new plugs tried)

There is good compression (new 27cc head kit)

Carb needles are at default settings.

Engine won't start???

I've tried richer/leaner low speed needle settings and put fuel directly in the head but it still won't fire.

Any ideas?

p113

try taking the pry out and cranking the engine that sould get out any unburt fuel which is in there just dont look at it when you do it cus oil can travel then dry the plug and take some fine sand paper and sand the to points where it sparks then try to start if that doesnt work and ur getting a spark it could be your ur fuel mixture

Pigsmightfly

Thanks but I've tried that with no luck.

Fuel mix is 25:1, same as I always use.

Engine ran fine last time I used it but it's been sat unused for a month or two.

p113

do you use the chocke whats your starting procedure

Pigsmightfly

Starting procedure hasn't changed in the 6 months or so that I've been running the car

p113

try increasing the trim when you strt it i cant think why it wont start if you havant changed anything

Pigsmightfly

I appreciate you're trying to help but I'm not daft The problem isn't something as simple as trim settings, starting procedure or fuel mix.

radio_controlled_mad

sometimes plugs spark when you have them out of the engine - but soon as you put them in a combustion situation they fail but you say you have tried 2 new plugs so the chances of 2 duff ones is unlikely,if none of the mixes have been touched or you aint added aftermarket filter and pipe i would suggest checking none of your cylinder head gasket has blown and the engine wont start because of to much air - failing that its either electrical or crap in the carb.

HeatFire

checked and cleaned the pipe??
check airfilter 2(but you have probebly already done this)

j2oboy

i had the same problem on my mb i tryed everything ................ eventually we found that the ht lead was split inside the casing ...................... good luck .....

hellya

Your idle set on the carb???? no idle no start

Pigsmightfly

Going to take it to local engine guru tomorrow and see what he says.

Tried adjusting idle but it still won't fire. Exhaust is fine and air filter element was replaced prior to use.

Thanks for the help, I'll report back after it's been looked at tomorrow. Got a spare engine due to arrive tomorrow so it's not too much of a problem.

p113

why do you have a spre engine

Dr.ArmoMaxx

try oppening the throttle a lil bit then try firing it up

raptor 8

had that happen to me once, i took apart the carb and cleaned the internal screen, ie full of dust, ran just fine. started first pull. before that i had same problems as you.

badz

My Feedback: (1)

I'd set my both needles to factory settings...crank the idle screw all the way in..cause as hellya said without idle set it won't run...plop the choke down...prime it..and give it a whirl...should fire...then pull choke up and fire it up...you'll more then likely need to rev it up a bit to clear it out...2 cycles like to gunk up after sitting and need a good clearing out


I noticed you say new head kit? Is the gap between the flywheel and coil set right? It'll still produce spark if too far away but not enough to fire the engine.

jimbo1890

Is your fuel mix fresh??

the longer fuel sits the more volatile elements in the fuel evaporate.

Pigsmightfly

Thanks for the suggestions.

Took the engine to a local repair bloke this morning. The carb looks clean inside but he thinks one of the passages (can't remember correct term) may be dirty, he's going to run trace wire through it later to clean it out.

New engine fitted so I'm running again regardless

Thanks again.

radio_controlled_mad

blocked jets / ports !!!

Pigsmightfly

Find out tomorrow

Fuel was getting through though??

raptor 8

so did mine just not enough

Lee G

Steve if you had botherd asking, I would have told you to take the needle valves out and sparay some carb cleaner down the holes. HHad it happen to me loads of times.

So how many wheels and tyres has that mut of yours eaten or not been found

Pigsmightfly

Already done it mate, think I may have a particularly cunning family of illegal immigrants in there

Lee G

Have you cured the engine yet? If so, what was it apart from your crap driving

Pigsmightfly

Cheeky twonk [X(]

I'll have you know I'm top of the local league. Admittedly the only competition is a young lad with a knackered T-Maxx but he's quite good for an 8 year old.

Something was wrong with the carb. Bloke doesn't know what exactly but he tried a spare carb on the engine and it fired first time. Old carb was stripped, cleaned, poked and prodded until no trace of dirt remained but the engine still wouldn't fire with it fitted.