Any ideas for tuned p200

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Any ideas for tuned p200

Postby Vader19 » Sun Aug 22, 2010 8:42 pm

Hey all.
Here's the story, it's a bit long.
My P is having trouble. I started w/ a Mallosi 210kit. Sent it to TaffSpeed in UK for porting etc. Then Scooterworks in L.A. rebuilt the whole thing. w/ a Mikuni 32mm carb and fuel pump, reed valve/block, and a sick pipe.
It was sitting for a bunch of years, It's running but took about 15 kicks to get going, then Very awful performance. Over the weekend I took apart the whole carb, cleaned it out well... jets everything. Boom! It's starting 1st or 2nd kick. Road it for about 5-6 miles... Ran great. I'm still running in the rebuild so I'm going about %4 on the oil/gas mix. Let it sit overnight, 2nd kick start, great idle, but as soon as I get going it bogs out and wants to die. It's when I really give it some gas. Even parked, it idles nicely, but when you really get into the throttle, it bogs and wants to die. Sputters, bogs and out it goes. I thought maybe the fuel pump, but I see it getting plenty of gas, there are air bubbles as it runs, but most of the time the fuel line is filled. Still, starts on a couple kicks, great idle/rev, but when you really get it going and "gas it" in any gear, it... again... bogs out. The carb is sqeuaky clean, and I think adjusting the air flow screw to 2 turn out really helped.
Any ideas? Too much oil? (I just don't want to seize it. I do get a bit of oil out the exhaust.
I'd appreciate any strokes of brilliance... I know it's out there.
Cheers,
Chris
Attachments
114-1476_IMG.JPG
here's a basic pic of my setup.
Vader19
 
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Bikes Owned: '66 150 Super VBC
'80 P-200E

Re: Any ideas for tuned p200

Postby Greg » Sun Aug 22, 2010 9:04 pm

Oil shouldn't do anything but foul plugs and at 4% no big deal. I know you said the carb is clean but I would check the main jet for a clog on more time. I would also check to see if the passage way to the mail jet is clear. For it to work then all of a sudden not work makes me think its not a setting. I know another simple question is your tank clean or do you run a filter?
Cheers!
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Re: Any ideas for tuned p200

Postby Vader19 » Tue Aug 24, 2010 8:47 am

Thanks Greg.
Yeah, I think my tank needs to be cleaned out. Now it's starting on 1st kick but wont keep going. I guess another carb clean-out will be in order(crap!), I'll have to check the fuel pump as well... Does it seem right that I do have a lot of air (intermittent) in my fuel line?

Cheers,
Chrs.
Vader19
 
Posts: 22
Joined: Thu Jul 15, 2010 9:12 am
Bikes Owned: '66 150 Super VBC
'80 P-200E

Re: Any ideas for tuned p200

Postby Greg » Tue Aug 24, 2010 11:30 am

I wouldn't worry about the air in your line. It just dumps in the bowl and collects. It does however sound like you have a dirty tank.
Cheers!
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80's Frankenvespa
1972 Triumph Daytona
1973 BMW R75/5
1989 GB500
Your Mom

Re: Any ideas for tuned p200

Postby Vader19 » Tue Aug 24, 2010 9:14 pm

Man, that really hurst. No one ever told me my tank was dirty before... well... now that I think about it...
Vader19
 
Posts: 22
Joined: Thu Jul 15, 2010 9:12 am
Bikes Owned: '66 150 Super VBC
'80 P-200E

Re: Any ideas for tuned p200

Postby Linkner » Thu Aug 26, 2010 4:26 pm

3% is Malossi recommended. More and you're just leaning out the mixture. I'm assuming the jetting is correct for this elevation, and you've corrected for temperature too (it's significantly colder outside so you're running leaner. On highly tuned bikes you need to change jets frequently based on temp). If not, rejet. Otherwise, the diaphram on those fuel pumps gets gummed up really easily. Rebuild the pump would be a good idea. Other than that, it's hard to tell without riding the bike. Could also be ignition being a pain or loose wiring. Worth a check, but make that last as I don't think it's probably the culprit. Doesn't take but 2 sec to swap a CDI to check it. Hope that helps. Ciao.
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Re: Any ideas for tuned p200

Postby Vader19 » Tue Aug 31, 2010 10:36 am

Much appreciated. I've got a feeling it's the fuel pump. It's been sitting for so long, and all that oil etc. I'm gonna "rebuild it".
Cheers,

Chris
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Posts: 22
Joined: Thu Jul 15, 2010 9:12 am
Bikes Owned: '66 150 Super VBC
'80 P-200E


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