richybanshee Posted November 29, 2013 Report Share Posted November 29, 2013 First of all hope every one had a good "Thanksgiving day". The problem: The right cylinder seems to not be working properly. You can hear the left pipe but no the right pipe. If you put your hand like a feet from the silencers you can feel the back pressure on the left but on the right is almost no pressure and cold. When I rev the bike, half way it just stays revved up. Mods I have done recently: Like a month ago I removed TORS system (everything) and installed Motion Pro replacement system with new throttle cable. I initially synchronized the carbs by eye. Yesterday I installed new VForce4 reed cages. Lubbed the throttle and clutch cables. A little story: Riding the bike after the TORS where removed seem to be ok. At some ATV event a guy told me my bike may have carbs out of sync because he heard the left pipe but the right pipe did not sound the same. He showed me the problem by revving the bike a little and the back pressure on the left was good but the right came to life after more the 1/4 throttle .I rode the event and the bike performed ok but not good and I had on the back of my mind what the guy told me about the carbs. SO I called FAST and bought the carb sync tool and VForce4. After installing the VForce4 I started to sync the carbs but the bike just stayed revved and I had to shut everything down. I checked the carbs, the reed cages, the throttle cable but everything seems to be ok. I thought it was jetting related so I put the needle jet in the 4th position. I fired up the bike again but the right pipe is working colder and the bike stayed revved up. Bike Mods: FAST (NOSS) Cool Head with 20cc dome... last time I checked compression was 150 psi Timing plate +4 CPI small bore inframe drag pipes TORS Removed stock 26mm mikuni carbs jetting (Pilot: 27.5; air screw: half turn out; needle jet: 4th notch; main: 300) I will take the right pipe out, check compression and maybe take the cool head out to see the right cylinder. Any ideas? Quote Link to comment Share on other sites More sharing options...
m671054 Posted November 29, 2013 Report Share Posted November 29, 2013 Check for the rubber choke hose between the carbs. possible not connected Quote Link to comment Share on other sites More sharing options...
richybanshee Posted November 29, 2013 Author Report Share Posted November 29, 2013 I'm still having issues with the bike revving up. The rubber choke between the carbs is correctly installed. I have checked the compression of the cylinders an it is at 145 psi each. Took right pipe out... does not seemed to be plugged, damaged... nothing. I have sprayed carburator cleaner around the gaskets in the reed cages, the carbs, while the bike was idleing and found no air leak. As far as I know if there was some kind of air leak around those areas the bike would have revved higher... did not happened. I did notice the right side is working a little better, had to turn air screw all the way in (may have to get 30 pilot). Bottom end seems to be improved and it wheelies when I throttle the bike. I have switch coils and still the same issue. I will keep trouble shooting it. Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted November 29, 2013 Report Share Posted November 29, 2013 (edited) Maybe your slides are in backwards. check to see if the cut outs are facing the rear of the carbs. Edited November 29, 2013 by sstaton1983 Quote Link to comment Share on other sites More sharing options...
dave5.0 Posted November 29, 2013 Report Share Posted November 29, 2013 Are both slides bottomed in the carbs? Quote Link to comment Share on other sites More sharing options...
richybanshee Posted November 29, 2013 Author Report Share Posted November 29, 2013 I have a video of the problem on my U tube page. I'm sure the throttle cable is not sticking. Even though the carb slides are not shown I KNow they are not stinking because the same situation happened when I tried synczing the carbs and the slides were all the way down. In the video you can see the even when I turn the switch to the off position the bike stays revved consuming whatever full is left. I was able to kill it by putting the bike in gear and slowing releasing the clutch. Please advise. Quote Link to comment Share on other sites More sharing options...
richybanshee Posted November 29, 2013 Author Report Share Posted November 29, 2013 Back pressure on silencers: Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted November 29, 2013 Report Share Posted November 29, 2013 If the slides are not sticking or installed wrong I would deff be looking for a lean condition causing the run away. Quote Link to comment Share on other sites More sharing options...
richybanshee Posted November 29, 2013 Author Report Share Posted November 29, 2013 Ok. I'll try to find the whatever is causing the lean condition. Took the cool head out to see if there was any kind of damage and there is none. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted November 30, 2013 Report Share Posted November 30, 2013 Should have done a compression test before yanking the head. Have you done a leak down? Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted November 30, 2013 Report Share Posted November 30, 2013 (edited) Should have done a compression test before yanking the head. Have you done a leak down?he said 145 in both sides. I agree on leak down test. Edited November 30, 2013 by sstaton1983 Quote Link to comment Share on other sites More sharing options...
m671054 Posted November 30, 2013 Report Share Posted November 30, 2013 Verified jets are clean and installed correctly? Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted November 30, 2013 Report Share Posted November 30, 2013 Read the plugs and see if they are burning the same. Maybe have another look at your reeds. I have seen piston skirt failure cause a high rev but not necessarily run away with no spark. Quote Link to comment Share on other sites More sharing options...
bluebanshee98 Posted November 30, 2013 Report Share Posted November 30, 2013 that same thing happened to my friends cub when we tried these carbs that he had. we got it to shut off after covering the carbs with our hands and choking the bike. haha my buddy was shitting bricks when it woudnt shut off. put some pwk carbs in and problem solved. more then likely something is up with the carbs... jetting might not be clean ect Quote Link to comment Share on other sites More sharing options...
quadgod211 Posted November 30, 2013 Report Share Posted November 30, 2013 My 4mill does the same thing at idle...left side doesn't puff any air out just a lil smoke until I pick the throttle up but it runs awesome and has crisp throttle response....just idles funny is the only prob...i have pwk 35 w/ after market idle screws is what I blame mine on I seen alot of bikes hang open like that on alky but not gas...i guess there's enuff heat in there to burn gas after spark maybe Quote Link to comment Share on other sites More sharing options...
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