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Post by sevenninesandtens on Jun 24, 2020 8:48:25 GMT -5
haven't had a chance to check yet. I'm a stay at home Dad with 2 kids under 5 so I don't get much free time. Hoping to check it this weekend. Gonna pull the cylinder off and double check the piston for damage just to be safe with all the nonsense first. Fingers crossed.
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Post by matlock on Jun 24, 2020 10:16:36 GMT -5
ok
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Post by sevenninesandtens on Jun 26, 2020 20:47:26 GMT -5
UPDATE:
Had about 45mins to check on her and I can't get the engine to turn over now.... from one extreme to the other! I got it to run for a few seconds but had to keep giving her gas. Either doesn't even turn over or it'll sputter and quit. Tightened the throttle cable and have the idle screw pretty far in. Air screw is at 2 turns out and I put my stock air box back on. Has a cable choke and doesn't seem to make a difference if it's pulled or not. I dunno. Could the idle jet be too low? It's a 38 now. Which is the stock one the Polini carb shipped with. I am excited because this is a much less stressful problem. I had so much anxiety from the engine racing to 9500rpm has soon as I kicked it over. Like no pause, just screaming rpm's. So this is much nicer if I'm being honest.
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Post by sevenninesandtens on Jun 27, 2020 16:32:37 GMT -5
Been fiddling with it again today. Got it to run for about 15 seconds before it stalled out. I checked float height, and checked the jets to make sure they were clear, they were. Upped my pilot to 42 then 46. Still getting the same thing. It did the 15 second run with the 42 pilot jet and the air screw at 5 screws out. So I upped to the 46 (skipping the 42 I have) and went back to 2 turns out on the screw. Still the same. Will sputter for a second or 3 then stall.
I dunno what the issue is. Needle is in the middle setting, main jet is 80. Stock airbox with the snorkel removed. The choke doesn't make a difference in the least. Maybe even be worse with it on since it doesn't run for more than a second or 2 with that. I dunno. Anyone got any ideas? Am I missing something?
I got really excited when it ran for 15 seconds.
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Post by sevenninesandtens on Jun 27, 2020 19:24:01 GMT -5
Update again:
She's running! I never changed the old gas that was in her from before the winter. So I'm sure that has something to do with it. RPM's jump around a bunch ranging from 1500-2100 and they don't climb or run up on me too much. I had a fan on to push the fumes out of the workshop and noticed when I stood in front of the airbox blocking the fan the RPM's would drop. I think I may be a little lean still. I may take it out tonight before bed for a quick trip around the neighborhood and see how the spark plug looks. I had it running for 20-30 mins to warm it up earlier then shut it off and went back after dinner and said if it starts right up I'll be in okay shape and she did. So now on to tuning.
Then I got a text offering me a Honda Shadow 750 for $500 delivered just needs a carb cleaning... which I am fully versed in now lol!
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Post by sevenninesandtens on Jun 28, 2020 21:00:07 GMT -5
ok now she's running for a bit then stalls out. takes 2-3 kicks to start back up. I took the scoot out for a quick spin and it stalled when I came to a stop light. Every time I got to a light (live in the city so it's every block) I had to give it gas to keep it from stalling. I know the gas is old so I'm gonna swap that out tomorrow. Carb is brand new and I checked both jets and they are clean as a whistle. Hoping it's just crappy old gas causing the issue. Also what grade gas should I use? I was planning on 91 or 93
Idle jet is 46 Main 80 Needle in mid position.
Idle kind of dips and rises. I got it warmed up then set the idle at around 1800rpm. Let it run for a bit and watched the rpm's go up slowly then dip down then back to 1800 then 1900 up to 2010 then back down to 1800 then down to 1600 then back up then stalled.
not sure what would cause that though.
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Post by sevenninesandtens on Jul 2, 2020 16:34:05 GMT -5
did a compression test.... not sure if I'm doing it right I followed a video by the admin on here. put the compression into the spark plug and WOT while kicking it over and I got a whopping 30psi.... that doesn't seem right. Anywho if that is right how do I increase the compression?
hoping someone can come chime in here soon.
In the meantime I took off all the plastic and repainted the scoot. Went from a beat up purpley blue metallic color to cotton candy pink (I'm sure my daughter is going to steal it from me in 14 yrs so I got a head start for her). Just wish I could get it running smoothly now.
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Post by sevenninesandtens on Jul 3, 2020 9:09:35 GMT -5
it's like crickets in here!
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Post by Zino on Jul 3, 2020 10:03:26 GMT -5
91 octane is fine Your Idle jumping around may be air leak on the intake side . With the scooter running . I use a unlit propane torch to find leaks Spray some starting fluid around the seams of the carb inlets . If the idle speed changes you have found a leak .
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Post by Zino on Jul 3, 2020 10:12:32 GMT -5
Now if you find no Air Leaks . What does you plug Look like ?
If your scooter is have a hard time holding a idle that mixture is off or the speed is not enough . I set the Idle this way Turn the screw till I get the fastest and smoothest idle and than just turn it 1/4 turn rich
Now if idle works fine and then gets worse after it gets warm after a a couple miles of running. You might just be a little lean on the needle Go down one clip and see if that cleans it up .
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Post by sevenninesandtens on Jul 3, 2020 12:21:59 GMT -5
Thanks! No air intake leaks. I did a leak down test and sealed everything up then did it again and there's no leaks. Holds 6psi for 45mins with no drop at all.
Plug is rich I think. The hook thingy where the spark is, is light brown to the bend then pretty dark as it meets the top plate thats on top of the threads. Smells like gas and the first 4-5 threads nearest the end are wet.
I'll pick up some starter fluid and try that. Any clue why my compression test is coming back at 30psi? Did it again today and got the same results.
With the idle I can't get it to stay steady, I can get it to 1800rpm and it'll go up and down on it's own. not racing up or down really. It did that before where I'd test ride it get to a stop and the RPM's would go up to around 2300 or so. That was before the leak test and all this. Once I got the air leaks sealed it now will slowly meander in the rpm's anywhere from 1500-2100 just bobbing around till it eventually just cuts out and shuts off. I need a new battery for the RPM gauge too though. So that may not be helping much lol.
So long as I gave it gas on the most recent test ride that was maybe a mile long, it wouldn't stall. But I had to give it throttle the full time I was stopped.
Thanks for chiming in and for the help!
Not really sure what the issue is. going to go back down with the pilot jet. 46 is too high. Stock was 38, but i was still using the old gas and was having a devil of a time turning the engine over so I moved up.
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Post by Zino on Jul 3, 2020 14:56:19 GMT -5
Wet Plug Maybe you are on the other end of jetting and you are flooding it . With the 46 jet how many turns out on the idle mixture screw are you ? When you switch back to the 38 . That might be your fix .
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Post by sevenninesandtens on Jul 3, 2020 16:47:01 GMT -5
Wet Plug Maybe you are on the other end of jetting and you are flooding it . With the 46 jet how many turns out on the idle mixture screw are you ? When you switch back to the 38 . That might be your fix . Went down to 42. Def lean there. I'm getting there though. Didn't stall at all but I could tell it was lean, when I let off the gas it would knock a little bit. never went more than 1/4 throttle and hit 37mph. Good lord this puppy is fast now. Thanks for all the help!
Still dunno what's up with the compression but it's running now and I just gotta dial it in I think. Then get new wheels. These have hit some major potholes before the scoot came to me. It's like driving on cobblestones!
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Post by Zino on Jul 3, 2020 17:46:56 GMT -5
No way you are at 30 PSI if you are fast then you have good compression.
If you let off the gas and you are back firing richen up the needle by dropping down one clip and see if that cleans it up.
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Post by sevenninesandtens on Jul 3, 2020 19:28:05 GMT -5
Ran outta time today, I'll do that tomorrow and report back. Also gotta shorten my throttle cable a touch. When I took all the panels off to paint I noticed how long it was. I did it months ago and just rough guessed the length. All the adjusters are a touch away from being maxed out. Measure once cut 37 times as I always say!
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