PW50 help

alphado
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alphado
Edited Date/Time 1/27/2012 12:37pm
I bought a PW50 last night for the little guy Matthew. He had some issues with throttle control, but we will deal with that.

Had a problem with it. Everytime he stalled it, we couldn't get it to start. The only way it would fire is if I turned off the petcock, drained the gas from the bowl and kicked it. Once it started I would turn on the gas and it would be ok. Float level is off? It has the oil injection removed.

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edgo897
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edgo897 6/14/2011 4:48am
6/14/2011 4:48am
It probably needs a good carb cleaning and a new plug. It shouldn't stall on him since it has a centrifical clutch. Maybe turn the idle up a little. I don't remember there being much in the way of float adjustment in that carb, but the float could be sticking open causing it to load up and stall. Is the plug wet after it stalls?
Hman144 6/14/2011 4:49am
6/14/2011 4:49am
Alph-

The first thing that struck me was the question, "Why is it stalling in the first place?" Find that answer and maybe you're done with the start problem.

H
alphado
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alphado 6/14/2011 5:02am
6/14/2011 5:02am
It stalled when he crashed it.
Canook
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Canook 6/14/2011 5:29am
6/14/2011 5:29am
How was the plug? They will load up when puttiing around. Premix requires different jetting too.

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Cygnus
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Cygnus 6/14/2011 6:10am
6/14/2011 6:10am
Needle and seat might be leaking.
CCMX
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CCMX 6/14/2011 6:11am
6/14/2011 6:11am
Be aware at AMA events you can be dq'd for the oil injection not hooked up
part-timer 6/14/2011 6:24am
6/14/2011 6:24am
Im not sure how to help with your question, but just wanted to comment - your son looks like he fits well on the bike.
How old is he?
I have a 6 yr. old who wants a Yamaha (he would definitely fit on a 50) , but I have been holding out for him to grow (physically and mentally) a bit.
Boarddesign
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Boarddesign 6/14/2011 6:42am
6/14/2011 6:42am Edited Date/Time 6/14/2011 6:43am
Turn up the idle a bit, sometimes they need to have the choke pulled (when hot) to start after they shut off.

Agree with above post, put injection system back on, do a 65 main jet (any tuning can be done with air/fuel screw) a twin air filter (replacement) some bar risers and real footpegs. This will produce a good little race bike. Later you can do a Qt gear for best results.
LoudLove
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LoudLove 6/14/2011 6:53am
6/14/2011 6:53am
PW50 jets (especially the pilot) have very small diameters and clog easily, so make sure they are thoroughly cleaned. Also check the float to ensure it's working properly. You can test by removing the float and submerging it in a glass of water. It should immediately pop to the surface when released.

You can pick up a new carb on eBay for about $50 with shipping. It's a lot less expensive than replacing parts piecemeal.

Also, try to avoid gas with Ethanol. It's been proven to accelerate carb degregation, especially in high-RPM vehicles (motorcycles, boats, etc). While Ethanol won't destroy the carb, it will increase the maintenance requirements.

Other than the carb the PW50s are nearly bulletproof. Fix the carb, make sure you have plenty of oil (don't let it get below half full), and keep fresh gas in the tank. Go play!
typ2vw159
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typ2vw159 6/14/2011 6:59am
6/14/2011 6:59am Edited Date/Time 6/14/2011 7:07am
alphado wrote:
I bought a PW50 last night for the little guy Matthew. He had some issues with throttle control, but we will deal with that. Had a...
I bought a PW50 last night for the little guy Matthew. He had some issues with throttle control, but we will deal with that.

Had a problem with it. Everytime he stalled it, we couldn't get it to start. The only way it would fire is if I turned off the petcock, drained the gas from the bowl and kicked it. Once it started I would turn on the gas and it would be ok. Float level is off? It has the oil injection removed.

You are have a venting issue. Take that crappy gas tank vent off the cap and put a stock hose on it.And check for plugged carb vent hoses.( But it is that gas cap vent junk!) P.S. don,t put that dirty injector back on there for people who can,t mix gas right .
alphado
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alphado 6/14/2011 7:10am
6/14/2011 7:10am
Matt is 6, I'll clean the carb.
Yamaharider1474 6/14/2011 7:24am
6/14/2011 7:24am
alphado wrote:
Matt is 6, I'll clean the carb.
And look at the needle and seat if you see a good size ring on the nipple replace it.
Faceaz
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Faceaz 6/14/2011 8:21am
6/14/2011 8:21am
I'd go with you float level, needle / seat. Vents are working if it drains when you tip it.
Boarddesign
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Boarddesign 6/14/2011 8:34am
6/14/2011 8:34am
typ2vw159 wrote:
You are have a venting issue. Take that crappy gas tank vent off the cap and put a stock hose on it.And check for plugged carb...
You are have a venting issue. Take that crappy gas tank vent off the cap and put a stock hose on it.And check for plugged carb vent hoses.( But it is that gas cap vent junk!) P.S. don,t put that dirty injector back on there for people who can,t mix gas right .
It has nothing to do with mixing gas right, it's about having a legal bike to ride. How awesome would it be to have your kid disqualified due to being "able to mix gas right".

The ethanol topic above is also a good point, look for fuel free of it or add 1/3 AV gas to reduce loading up.
SteveS
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SteveS 6/14/2011 8:36am
6/14/2011 8:36am
Given Joey's history, I'd say Dennis isn't aiming for Loretta's.
alphado
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alphado 6/14/2011 8:51am
6/14/2011 8:51am
We are definatley not racing it, just riding.
Boarddesign
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Boarddesign 6/14/2011 10:32am
6/14/2011 10:32am
alphado wrote:
We are definatley not racing it, just riding.
That's what they all say! Smile
captmoto
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captmoto 6/14/2011 12:07pm
6/14/2011 12:07pm
Ethanol eats fuel lines. It kinda melts it and looks like sludge in the carb. I had this issue with a 99 yz400 that sat for 4 months. I could not clean it with spray cans and air. It needed a soaking at a bike shop. Thats when we saw black sludge coming out. Now this problem along with tiny jets and passages in the carb could be causing your sitch. Make sure you find fuel line that is alcohol compatible.
motomental1
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motomental1 6/14/2011 2:00pm
6/14/2011 2:00pm Edited Date/Time 6/14/2011 2:01pm
i had a couple pws. pilot jets were bad about clogging made it hard to start even with the choke was on. also had an issue with the exhaust port were the pipe and head join clogging with carbon. was clogged so bad a coffee stir stick would not fit through. bike would run ok for a little bit get hot then lose power and was hard to start. ebay best place to buy pw parts also they were both premix 40 to 1 belray H1R

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