Bike very hard to start and won't crank with choke on? urgent help needed!!

2strokesteve89

2strokesteve89

You said you checked the valves, the main thing I hear you saying is it starts better cold with choke off, that indicates over fueling , is the plug wet and black, or sooted looking? Also if you want to lay to rest your valve concerns, check compression, I'm not sure what you should see on a 4 stroke but if valves are tight compression will be low.
 
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pdee4t

2strokesteve89:
You said you checked the valves, the main thing I hear you saying is it starts better cold with choke off, that indicates over fueling , is the plug wet and black, or sooted looking? Also if you want to lay to rest your valve concerns, check compression, I'm not sure what you should see on a 4 stroke but if valves are tight compression will be low.
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nah plug is brand new. its still white.
my bike has an auto decompresser, so i can only partly check compression. will only read up to 120 PSI till the auto decomp kicks in.
i know the valves are looser if anything.
 
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pdee4t

2strokesteve89:
We'll that tells you a lot, you definitely have a over fueling condition
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if its over fueling, could it possibly be the choke circuit? or 1 of the air jets(bike getting starved for air)? because i did notice it got hotter a lot quicker in the minute or 2 i was running it. the engine was too hot to touch just after a minute or 2.
 
2strokesteve89

2strokesteve89

pdee4t:
if its over fueling, could it possibly be the choke circuit? or 1 of the air jets(bike getting starved for air)? because i did notice it got hotter a lot quicker in the minute or 2 i was running it. the engine was too hot to touch just after a minute or 2.
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It's hard too say without seeing it but it seems. It's a carb problem, was it running good before or did it gradually get worse.
 
2strokesteve89

2strokesteve89

Guess all I can say is go thru carb again , maybe you missed something last time, the first thing I do when I take carb off is pull the bowl, blow thru carb at fuel line if I can with float hanging, then I've gotta needle and seat problem, if that's ok I raise the float then I should be able to blow thru it, if no problem found there then I go thru carb, clean it re set the float level and go. If you find problem let me know, it's hard to help from here but maybe one thing I said will put you on track, good luck.
 
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pdee4t

thanks so much for the advice :)
ive already tested the float so ive ruled that out. next to check is the choke circuit and the air jets. its definitely a fuel problem, so most likely not valves or anything else.
may even just take the carby to a re-builder and get it rebuilt.
 
Mihylo33

Mihylo33

Clean the carb twice and then clean it one more time..... I've been down this road before from lawn equipment to pw50's..... ...more than I care to ponder.
 
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