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UTC

Hooked
1981 P200e, S-Works Stumpjumper
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Hooked
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UTC quote
Been trying to get my idle adjusted. I was running lean before. I had to rotate the mix screw 4+ turns and it was still bogging for a second when I would gun the engine in neutral.

Switched the atomizer to a BE4 (lots of mixed info ou there on whether that is richer or leaner than a BE3) and seems to be much better.

P200 with 24/24 carb. Pollini 208 kit with Sito Road exhaust.
Currently running 135/BE4/60 main stack.
55/160 pilot/idle.
Idle screw is set at 1 5/8 turns out.
Air mix screw is at 3.5 turns out.
Here is the motor idling - how does it sound to you guys?
Here's it returning to idle after gunning the motor... does it take too long to come back to idle?
Also attached is a pic of the plug after a 2-3 mile ride with the engine hitting WOT.
Forum member supplied image with no explanatory text
@hibbert avatar
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Molto Verboso
Vespa
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Molto Verboso
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UTC quote
idle speed is too fast. For starters turn out the slide stop and bring the idle speed down. Then turn out the air mix.
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
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Jet Eye Master
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UTC quote
Yeah, too fast. If thats the slowest you can get the tickover then you have an oil seal leaking. Any oil in the gearbox?
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Hooked
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UTC quote
This sounds too lean to me!

"Currently running 135/BE4/60 main stack"

Would you double check your mixer-stack setup?
Something seems wrong here.
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Enthusiast
1980 P200e
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Location: Hendersonville,NC USA
 
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1980 P200e
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Location: Hendersonville,NC USA
UTC quote
What is the factory spec. for RPM on a P 200e
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Hooked
1981 P200e, S-Works Stumpjumper
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Hooked
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1981 P200e, S-Works Stumpjumper
Joined: UTC
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Location: Los Angeles
UTC quote
jocco wrote:
This sounds too lean to me!

"Currently running 135/BE4/60 main stack"

Would you double check your mixer-stack setup?
Something seems wrong here.
That's actually what I am running...
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Hooked
1981 P200e, S-Works Stumpjumper
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UTC quote
Jack221 wrote:
Yeah, too fast. If thats the slowest you can get the tickover then you have an oil seal leaking. Any oil in the gearbox?
Sorry for my ignorance but isn't there SUPPOSED to be oil in the gearbox?
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Hooked
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I think what Jack meant was is there any oil in the gearbox left, or is the level low.

Because a bad seal would suck oil in the cylinder.

And please post a pic of you main stack so you could get a better advice, cause those air and fuel jets are not right.
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Hooked
1981 P200e, S-Works Stumpjumper
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UTC quote
jocco wrote:
I think what Jack meant was is there any oil in the gearbox left, or is the level low.

Because a bad seal would suck oil in the cylinder.

And please post a pic of you main stack so you could get a better advice, cause those air and fuel jets are not right.
Got it - make sure there ACTUALLY IS oil in the gearbox. Will do.

I'm pretty positive those jets are what I have but I will pull it and post a pic here just to be sure.
@hibbert avatar
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Molto Verboso
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Molto Verboso
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UTC quote
make another video of you turning out the idle screw. Try turning it 1/4 turn at a time and let's see how slow you can get it and keep running. Once you have a slower idle then you can start cleaning the air fuel. It's close, don't think it's an air leak. Make sure you get the engine warm before you start.

I agree it sounds lean, at least too much air coming in the slide and maybe some adjustment to air fuel.
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Hooked
1981 P200e, S-Works Stumpjumper
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UTC quote
hibbert wrote:
make another video of you turning out the idle screw. Try turning it 1/4 turn at a time and let's see how slow you can get it and keep running. Once you have a slower idle then you can start cleaning the air fuel. It's close, don't think it's an air leak. Make sure you get the engine warm before you start.

I agree it sounds lean, at least too much air coming in the slide and maybe some adjustment to air fuel.
Will do. Appreciate it. Here's a photo of the slide as it currently sits for reference.[img][/img]
Forum member supplied image with no explanatory text
@hibbert avatar
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Molto Verboso
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UTC quote
close it
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parallelogramerist
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parallelogramerist
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UTC quote
Maybe it's my computer screen, but that spark plug in the picture looks VERY lean to me. When i had a 208 kit, i was runnning a 160/BE3/ and a 135 main...and that 135 was still too lean for highway cruising speeds.
@imkenmartinez avatar
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Enthusiast
79' Vespa P200e
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Location: Peachtree City Georgia
 
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79' Vespa P200e
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UTC quote
Idle
Wow, I thought that sounded pretty good. It got me wondering how far off mine is. If i can figure out how to upload a video here, I am going to ask for your kind assistance of getting mine squared away.
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
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Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
Joined: UTC
Posts: 4437
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UTC quote
That plug is dangerously lean. And the wet black on it means you either dropped it in some oil before taking the picture or flooded in some way before the plug came out. So rich and lean at the same time. Just says oil seal but I always think its the oil seal and other times its the oil sucker from the casing join.

With that jetting it should be richer, so there is something not right. If the gearbox is holding oil level. Hopefully is just the jetting. Either way, if it is leaking air the cylinder will not be getting oiled properly.
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Hooked
1981 P200e, S-Works Stumpjumper
Joined: UTC
Posts: 263
Location: Los Angeles
 
Hooked
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1981 P200e, S-Works Stumpjumper
Joined: UTC
Posts: 263
Location: Los Angeles
UTC quote
jocco wrote:
I think what Jack meant was is there any oil in the gearbox left, or is the level low.

Because a bad seal would suck oil in the cylinder.

And please post a pic of you main stack so you could get a better advice, cause those air and fuel jets are not right.
Attached are photos of my main stack and idle jets...
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
OP
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Hooked
1981 P200e, S-Works Stumpjumper
Joined: UTC
Posts: 263
Location: Los Angeles
 
Hooked
@broken_hipster avatar
1981 P200e, S-Works Stumpjumper
Joined: UTC
Posts: 263
Location: Los Angeles
UTC quote
jocco wrote:
I think what Jack meant was is there any oil in the gearbox left, or is the level low.

Because a bad seal would suck oil in the cylinder.

And please post a pic of you main stack so you could get a better advice, cause those air and fuel jets are not right.
I drained the gearbox oil and it came out to about 130-140ml (reads at about 180 in the pic because I flushed it a bit to get all the old oil out). I think I read that a P200 takes about 300ml?

It just smelled oily to me, not necessarily gassy? Attached are a couple of pics of the old oil - I felt around and didn't notice any rubber bits or metal shards or anything else...
Forum member supplied image with no explanatory text
Forum member supplied image with no explanatory text
OP
@broken_hipster avatar
UTC

Hooked
1981 P200e, S-Works Stumpjumper
Joined: UTC
Posts: 263
Location: Los Angeles
 
Hooked
@broken_hipster avatar
1981 P200e, S-Works Stumpjumper
Joined: UTC
Posts: 263
Location: Los Angeles
UTC quote
hibbert wrote:
make another video of you turning out the idle screw. Try turning it 1/4 turn at a time and let's see how slow you can get it and keep running. Once you have a slower idle then you can start cleaning the air fuel. It's close, don't think it's an air leak. Make sure you get the engine warm before you start.

I agree it sounds lean, at least too much air coming in the slide and maybe some adjustment to air fuel.
First video is of current idle, at 2 1/4 turns out on Idle and 2 1/4 turns out on mix.
Second video is me adjusting the idle at 1/4 turn increments until it dies.
@hibbert avatar
UTC

Molto Verboso
Vespa
Joined: UTC
Posts: 1568
Location: California
 
Molto Verboso
@hibbert avatar
Vespa
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Location: California
UTC quote
sounds pretty good at the 2/3rd turn, good throttle response and it returns to idle nicely
UTC

Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
Joined: UTC
Posts: 4437
Location: London UK
 
Jet Eye Master
PX221 MHR, O tuned PX200, PX181 Quattrini and some motorbikes
Joined: UTC
Posts: 4437
Location: London UK
UTC quote
Sounding fine. I don't think there is anything so wrong. Mixture screw might be a 1/4 lean.
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