trickedcarbine Posted September 14, 2015 Report Share Posted September 14, 2015 24cc Quote Link to comment Share on other sites More sharing options...
pablopab50 Posted September 17, 2015 Author Report Share Posted September 17, 2015 For those who have the same issue as me to hold the Shearers tight. OEM and FMF Toomey springs are too short. That's why you break the cheap FMF and Toomey springs. OEM are stronger though. I took springs from a 2002 Yamaha SX Viper and they fit perfectly. Quote Link to comment Share on other sites More sharing options...
BANSHEEBEEFM2M Posted September 17, 2015 Report Share Posted September 17, 2015 24cc domes or blow the bitch up Sent from my LG-H343 using Tapatalk Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 17, 2015 Report Share Posted September 17, 2015 im running 24's on pump Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted September 17, 2015 Report Share Posted September 17, 2015 ^ to much logic. Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 17, 2015 Report Share Posted September 17, 2015 lol Quote Link to comment Share on other sites More sharing options...
Big Mike NY Posted September 18, 2015 Report Share Posted September 18, 2015 I ride in the woods. Fuck the airbox. Couldn't say it better myself! Quote Link to comment Share on other sites More sharing options...
pablopab50 Posted October 4, 2015 Author Report Share Posted October 4, 2015 (edited) Allright, I ran 160 mains, and the air screw is almost all turned out. Do I need a bigger or small pilot? The idle is way too low. But giving just a bit of gas and it sounds good. The needle seemed ok (position) but how are you really sure if it's not too lean or too reach though... I got used to determinate whether it's too rich or too lean by the ear... Like I said at idle it's clearly too rich in my opinion cause it even stalls. And could it be the fuel screw? ( GROUND SEA LEVEL ) It was 50deg F With Pods Edited October 4, 2015 by pablopab50 Quote Link to comment Share on other sites More sharing options...
pablopab50 Posted October 4, 2015 Author Report Share Posted October 4, 2015 Here is one of the firsts start ups. When I press the chokes down you can hear the slow idling for few seconds until I slightly push the throttle to keep it running. https://www.youtube.com/watch?v=3jKcqnau180 Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 4, 2015 Report Share Posted October 4, 2015 Allright, I ran 160 mains, and the air screw is almost all turned out. Do I need a bigger or small pilot? The idle is way too low. But giving just a bit of gas and it sounds good. The needle seemed ok (position) but how are you really sure if it's not too lean or too reach though... I got used to determinate whether it's too rich or too lean by the ear... Like I said at idle it's clearly too rich in my opinion cause it even stalls. And could it be the fuel screw? ( GROUND SEA LEVEL ) It was 50deg F With Pods The 160 main is in the ball park but the spark plug will tell you if it's spot on or not. As for the idle, on the Keihin's you typically don't want more then 2.5 turns out. And if you find the bike feels blubbery and opening the air screw past the 2.5 turns doesn't fix it, you would be correct that it's overly rich. Drop one size at a time though. What pilots are in there now? Idle, just use the little black knobs on the slides to get it comfortably idling. Once it's close, use use the sync tool to get it perfect or feeler gauges to set the slides dead even if you don't have a sync tool. Quote Link to comment Share on other sites More sharing options...
pablopab50 Posted October 4, 2015 Author Report Share Posted October 4, 2015 Well I blew one spark plug, it made a PAK pik and then the cylinder died. Changed both spark plugs for new ones and ran like new. But obviously I was running lot of oil at first 30:1 and then 32:1 Now I'm maybe around 34:1. I used to run 36:1 in my stocker and it was perfect. But I'm still in the breaking in process as for the 421. I don't know my pilot size. I know for the main you can just unscrew the bowl and you will see the main but as for pilot and needle I guess you have to completely take it appart? As for the black knobs are you referring to the fuel screw? Off-subject. Damn those shearers suck in trails. Powerband starts at 6700 or so. I knew I should have bought CPIs. I have exhaust leak where the header mount on the silencer tube. I ordered cascades clamps. I'm using for now my old FMF rubber clamps but they do not completely seal. My head, cylinder, case, carb is all black from unburned fuel Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted October 4, 2015 Report Share Posted October 4, 2015 Well I blew one spark plug, it made a PAK pik and then the cylinder died. Changed both spark plugs for new ones and ran like new. But obviously I was running lot of oil at first 30:1 and then 32:1 Now I'm maybe around 34:1(These things tend to stay together when you know for sure what kind of oil ratio you have). I used to run 36:1 in my stocker and it was perfect. But I'm still in the breaking in process as for the 421. I don't know my pilot size (Really, get that figured out). I know for the main you can just unscrew the bowl and you will see the main but as for pilot and needle I guess you have to completely take it appart? As for the black knobs are you referring to the fuel screw? (The PWK's have a knob on each slide. The air/fuel screw is totally different) Off-subject. Damn those shearers suck in trails. Powerband starts at 6700 or so. I knew I should have bought CPIs. (Cubs aren't meant for trails) I have exhaust leak where the header mount on the silencer tube. I ordered cascades clamps. I'm using for now my old FMF rubber clamps but they do not completely seal. My head, cylinder, case, carb is all black from unburned fuel Quote Link to comment Share on other sites More sharing options...
pablopab50 Posted November 29, 2015 Author Report Share Posted November 29, 2015 Pilot jet was 68, tried 58 and 1 and half turns out and idle sounds good. Needle is set to middle. What you guys think? Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted November 30, 2015 Report Share Posted November 30, 2015 What do u mean u blew a plug, did u ever get the correct domes Quote Link to comment Share on other sites More sharing options...
pablopab50 Posted December 2, 2015 Author Report Share Posted December 2, 2015 What do u mean u blew a plug, did u ever get the correct domes By "blowing a plug" I meant burning. The plug either was badly fouled or it stopped working because I heard a bigger spark in the cylinder and in my opinion it's not from pre ignition. Right after 2 similar big sparks, the cylinder died. Issue was fixed by changing the spark plugs. Now obviously the temperature is way colder but as mentioned in my last post I changed the pilot jet so I would safely guess that the engine should be less rich and thus burn the gas better. Quote Link to comment Share on other sites More sharing options...
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