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Post by Zino on Jul 25, 2020 23:34:38 GMT -5
The 38 should have been close enough . Have you been tuning with the same plug working down from pig rich 98 to 94 to where it is now . What does the plug look like that is wet ? Black or Brown ? Try swapping in a fresh plug . The torque for the plug is 14 lbs it is not different for the polini cylinder head . Finger tight and then 1/4 turn tighter Is all it is .
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Post by sevenninesandtens on Jul 26, 2020 8:51:34 GMT -5
The 38 should have been close enough . Have you been tuning with the same plug working down from pig rich 98 to 94 to where it is now . What does the plug look like that is wet ? Black or Brown ? Try swapping in a fresh plug . The torque for the plug is 14 lbs it is not different for the polini cylinder head . Finger tight and then 1/4 turn tighter Is all it is . I’ll post a pic of the plug in a little bit. Going to pick up another scoot. A Yamaha CV80 that I’m getting for free. N+1 as they say! I did notice with WOT with the 90 main (put that in yesterday and went for a 5mi rip) that from 7/8 throttle to WOT it’s still kinda choking on itself. I could get to WOT but after a bit I’d lose it and if I rolled back off it’d go again. So still a little rich there I think. I only up jetted the Pilot cause I could get the engine to turn over. That’s at 36 now but the air mix screw is 3-3.5 turns out if I remember correctly. I’ll have to double check that when I post the plug pic.
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Post by Zino on Jul 26, 2020 10:34:23 GMT -5
You are right the main sounds rich if when you roll if it it stops gurgling and runs with more power . So go to the 88 .
If you are 3 to 3 1/2 turns out you basically dont have any control of your pilot jet and you leaning it way out . This pilot jet setting makes no sense for no matter what pilot you have you keep opening it wide open for more air Pilot jet is usually easiest to set just get it functional where you find a jet that runs between 1 1/2 to 2 turns out . Dial in the main then needle and then make a smal adjustment on the mixture screw Is this a manual or auto choke ?
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Post by sevenninesandtens on Jul 26, 2020 16:43:12 GMT -5
You are right the main sounds rich if when you roll if it it stops gurgling and runs with more power . So go to the 88 . If you are 3 to 3 1/2 turns out you basically dont have any control of your pilot jet and you leaning it way out . This pilot jet setting makes no sense for no matter what pilot you have you keep opening it wide open for more air Pilot jet is usually easiest to set just get it functional where you find a jet that runs between 1 1/2 to 2 turns out . Dial in the main then needle and then make a smal adjustment on the mixture screw Is this a manual or auto choke ? It’s a manual choke. I only upped the pilot jet due to it not starting and when I did it finally kicked over.
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Post by Zino on Jul 26, 2020 19:09:35 GMT -5
Plug color will give us some clues . Is it Blackish ?
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Post by sevenninesandtens on Jul 27, 2020 16:47:15 GMT -5
okay here's the plug:
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Post by Zino on Jul 27, 2020 20:51:25 GMT -5
Plugs not fouled . Overall You are close on jetting but still rich . The plug you are using is in the right heat range . Your ignition timing is right(this is not something people change unless they are going race set up ) Now sine you have a manual choke I only use mine when the scooter is real cold Otherwise I fire her without it. The choke in these is not a choke it actually adds fuel when it is open . So you really only use it to start it then shut it off as soon as you can 30 seconds to a minute works for me . You can use it as a tuning tool if you are tuning main or the needle ad want to get a idea if richer is better open up the choke/enricher if she runs better or the same you have room to move down. If it runs worse you know you are getting to the rich side of things .
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Post by sevenninesandtens on Jul 28, 2020 10:08:53 GMT -5
Plugs not fouled . Overall You are close on jetting but still rich . The plug you are using is in the right heat range . Your ignition timing is right(this is not something people change unless they are going race set up ) Now sine you have a manual choke I only use mine when the scooter is real cold Otherwise I fire her without it. The choke in these is not a choke it actually adds fuel when it is open . So you really only use it to start it then shut it off as soon as you can 30 seconds to a minute works for me . You can use it as a tuning tool if you are tuning main or the needle ad want to get a idea if richer is better open up the choke/enricher if she runs better or the same you have room to move down. If it runs worse you know you are getting to the rich side of things . I’m still confused about the pilot I guess. If I have it set to where it’s 1.5 turns out I need to have the 32 in. But the scoot won’t start. Is that where the choke comes in? It will only start with the 36 but then it’s 3 -3.5 turns out. What’s the solution to that? The wet ring where the washer should be is just from being rich still and not an air leak? With the 36 the idle acts lean. When I ride it and come to a stop the RPM’s hang for a bit then drop but then climb back up again which is a lean symptom right? Or is that specifically from having the air screw turned out so much? Thanks again so much for the patience. I’m sure I’ll look back and laugh at the ridiculousness when it’s finally tuned properly!
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Post by Zino on Jul 28, 2020 17:06:22 GMT -5
You need to start it with the choke/enricher when it is cold . Just flick it on Kick it over and leave it on fro up to a minute shut it off and head down the road .
When it is warmed up and you stop for less than 1/2 hour alot of times it will start without using the choke .
The pilot is not for starting it is just for idling when warm . You use the choke to get it up to temp with a temp gauge my auto chokes shut off around 120 degrees . You set the final pilot idle mixture and speed after the scooter is well warm .
If you are setting it while stone cold it wont run right when it is all warmed up . This might be why you are leaning out all your jets .
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