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Post by scooter7878 on Aug 19, 2021 18:02:47 GMT -5
Yeah if ur all way In With mix screw it's too much maby a 30 idle where is the screw set with the 27 idle? I messed up. I thought I had a 32 in it. It was a 35. Stuck the 32 in it, tuned it and it sounds amazing. Took a drive and I can still put my hand on the exhaust so it doesn't seem to be overheating. I got a temp gauge but it did end up coming with the wrong size connector that goes under the spark plug. I need to see if I can find the correct size for reassurance. I would like to get a oxygen sensor and gauge also to get that tuned up as good as I can. I'm riding this home today and going to use it for the weekend and will give an update. You have helped me out so much on this, I can't thank you enough. Is there a way to buy you a drink? nah man I appreciate it but I'm glad to help u kinda enjoy the chase if diagnosis of a issue glad it seems good
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Post by scooter7878 on Aug 19, 2021 18:06:49 GMT -5
After u ride a bit and know that it's fixed change the oil again it's probably contaminated with fuel and it can't hurt to be safe
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Post by scooter7878 on Aug 19, 2021 18:12:16 GMT -5
And man I honestly wouldn't have thought that small of a difference in a idle jet would have caused that bad a over heating issue from a 27 to a 32 a drivability issue yeah but hey I learned something too lol
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Post by renohal77 on Aug 23, 2021 9:00:19 GMT -5
It's definitely running cooler, it seems, but also, I adjusted the needle, too. I rode it this morning and it's so rich I almost kept dying at every stop light and smelled gas. When I got to work, I tried adjusting the afm but totally closing off the fuel did nothing. I thought 32 would have been good as I've seen videos with people using 32 in Colorado at 5000 ft, same as me, but I guess not. 32 was the smallest jet in the set I bought. Guess I'll have to find 31 and 30. I'm not good at this afm thing. I've seen so many videos and I'm really having a hard time with it still.
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Post by renohal77 on Aug 23, 2021 11:34:54 GMT -5
I just took apart the stock carburator and there is a 33 in it. I am so confused on what to do now. I guess put the needle back to stock instead one notch richer and put the 33 in and see if that works? I'm just afraid to make it start overheating again. I do remember when it was still stock at 50cc, it backfired a lot so may the 32 would still be better. Maybe I'll wait until the temp gauge is in as I had to return the one I got in and ordered the correct 10mm sensor. I would love a wideband O2 sensor, but $160 is just too much for me at this point.
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Post by scooter7878 on Aug 23, 2021 13:07:07 GMT -5
Try a 30 idle jet and put the needle back to stock
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Post by scooter7878 on Aug 23, 2021 13:14:15 GMT -5
Try it with the needle back to stock setting with the 33. If ur main jet or needle setting is too rich it can carry over to idle. It can load up at other throttle position and foul plug then when u idle it stalls bc the fuel fouled plug from a too rich main or needle setting. If I remember correctly u have a 90 main. Try a 85 main stock needle setting and 33 idle jet. Take plug out and clean it than start it let it warm up at idle and adjust screw. If it's running good at idle and not loading up than the idle jet is ok. Than drive it and see. U might have carry over from a main or needle setting
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Post by renohal77 on Aug 23, 2021 13:21:20 GMT -5
Yup, I thought the same thing. I set needle to stock and am going to try 32 idle and see what that does. Got the temp gauge in for the right size spark plug.. Woohoo!
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Post by scooter7878 on Aug 23, 2021 14:47:40 GMT -5
Yup, I thought the same thing. I set needle to stock and am going to try 32 idle and see what that does. Got the temp gauge in for the right size spark plug.. Woohoo! lmk how u make out but if anything also try a 87 or 85 main if u can run it long enough to warm up a bit than get in a long road and just wot it hold it wot for a long time try for a mile at least if not more. The bike should feel like its making power all the way through and should wind out at high rpm with no bog or sputter or in off feeling what so ever if when ur wot at any point u feel it lack power sputter get a dead spot or get a ping rattle noise ur main jet is off I can't see 90 being lean in ur case so if u feel anything but smooth power at any wot point go down a size at a time till it feels smooth all the way through
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Post by renohal77 on Aug 23, 2021 16:23:02 GMT -5
Yup, I thought the same thing. I set needle to stock and am going to try 32 idle and see what that does. Got the temp gauge in for the right size spark plug.. Woohoo! lmk how u make out but if anything also try a 87 or 85 main if u can run it long enough to warm up a bit than get in a long road and just wot it hold it wot for a long time try for a mile at least if not more. The bike should feel like its making power all the way through and should wind out at high rpm with no bog or sputter or in off feeling what so ever if when ur wot at any point u feel it lack power sputter get a dead spot or get a ping rattle noise ur main jet is off I can't see 90 being lean in ur case so if u feel anything but smooth power at any wot point go down a size at a time till it feels smooth all the way through I did that the last few trips home and I don't feel any bogging down at wot sustained for any given amount of miles. Seems like the main might be good. It just boggs down going from idle to just giving it the smallest amount of throttle. I switched the needle back to stock and left the 32 in and it still boggs down really bad even just on the kickstand. The needle didn't seem to change anything. Runs better with the afm screw all the way tight. I don't understand how the stock carburetor had a 33 in it at 50cc and ran better but this carburetor doesn't work with a 32. I'm at a loss. Bad carburetor? Bad jets? It ran fine going home Thursday...sat all weekend and today it's running so bad. I don't know. Edit: Re-reading your recommendation for the main jet, I get what you're saying now. 90 was the smallest they gave me with the BBK. The stock is 83 I think. I might as well get a set of those too. I changed the idle jet from the 32 new one to the 33 old one in the stock carburetor and now it goes up and down in rpms every 5 seconds or so. Closing off the afm screw does make it seem like it's dying now but then it goes up in rpms again. I got a 31 and 30 on the way.
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Post by scooter7878 on Aug 23, 2021 23:40:11 GMT -5
By turning screw in it's taking fuel away so if u can turn screw all way in and it doesn't stall right out ur idle jet is rich I believe the 30 is going to be the correct one. And u can't really say from stock carb to the new one there's other factors like stock is a 18mm carb and most likely the new one is either 19 or 20mm which causes the vacuum that's pulling the fuel through the jet to pull more or less fuel through same jet. For instance my set up with a 20mm cvk stock style carb ran a 105. I replaced it with a oko flat slide carb 21mm. I'm thinking bigger carb bigger jets. U started at 108 and got all way up to 125 before realizing u needed to be going smaller. I got stuck thinking bigger carb bigger jet when in reality I run a 88 now and it's perfect. There's more vacuum pull through throat of the 21mm carb so it's pulling more fuel through the jets. I'd start fresh if I were u. Wait for idle and mains jets to come in mean time clean what ever carb ur going to use good with carb spray. Check the diaphragm for the needle be sure there's no tears or anything wrong. There's a tab on the rubber diaphragm it will only go in one way be sure it's right bc any leak there will cause issues. Put needle clip in mid position. Put a 30 idle and 87 or 88 main jet. 85 if that's all u got main wise. Be sure there's no exhaust leaks at head and no intake leaks check the gasket and o ring put a little grey or black automotive silicone if needed but not too much. Check manifold for cracks. If all is good install jets and turn fuel screw all way in but don't bottom it out too hard there's a o ring at end of screw. If u have tighten it previously more than just bottom out remove screw and check or replace o ring in fuel screw. From bottom out turn screw out 2 turns. Un screw idle adjust screw till it's not making contact with throttle plate lever. Screw in till it just touches lever and maby like one full turn after contact. That should give u a base setting and it should run at least half decent if no issues exist. Lmk how u make out
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Post by renohal77 on Aug 26, 2021 17:39:55 GMT -5
Alright, making some headway. So the 30 seems pretty good. One and a quarter turn seems good. Lowest temperature is when it's idling now. Now that I have my temperature gauge, I'm hitting around 360-370 at WOT before I let off the gas. It can definitely get hotter. Do you think a 90 is too small? I know 95 is too big. The new set was just delivered to my home and there's a 92 in there I think I'll try. I'll keep you updated.
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Post by scooter7878 on Aug 26, 2021 19:17:38 GMT -5
Can't hurt to try the 92. If u have a rpm gauge record max rpm with each jet the highest rpm u achieve is where u want to be. Give or take a size up or down. Be sure when u record rpm ur in the same stretch of road with little to no head wind. I'm not really 100 percent sure but I don't think those temps are too high especially if it's hot out side note temp with 92 also and be sure air temps are similar when u do to get a accurate reading to compare to
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Post by renohal77 on Aug 26, 2021 19:19:10 GMT -5
Went one notch richer on the needle and tried a 92 main jet. Still got to 400F and couldn't get past 40mph. I got faster top speed with the 90. Not sure how I could possibly get the temp down. Going to try a smaller main jet and work that out. Problem is, if I do go smaller, that should raise the temp, right? Also, could the oil be contaminated enough with gas that it would start overheating now? The cruise speed still overheats as well, just not as quick as going wot.
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Post by renohal77 on Aug 26, 2021 19:22:32 GMT -5
Guess we were posting at the same time. It's 86F right now so not that hot. Actually pretty nice outside. The smoke from all the fires has let up a little for now, which is also nice. I don't have a tachometer. I thought the temp gauge was going to come with one but it didn't. The first one did but had wrong size sensor. The temps I was kind of going by was from this thread here: 49ccscoot.proboards.com/post/351476/thread . I know any temp number I take with a grain of salt, but when it reaches 400F, I kind of think that is a little excessive, but I could be wrong on that as well. That is about how hot it is when I start smelling weird smells coming from it.
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