TeamRealtreeHD Posted July 27, 2008 Report Share Posted July 27, 2008 (edited) After reading the "Keihin Bible" of jetting, I came across the jetting problem I am having. I have a problem with my 1/4 throttle area. It is boggong and is lazy to get on the power/top end of the motor. It is hesitating so to speak to get on the powerband. So I read this and came across something that I thought to myself... "that is the problem right there!" Here it is... I copied and pasted it DIAMETER: The needle diameter controls the jetting just above the pilot jet, right as the engine begins to pull. On most engine combinations the needle diameter is felt in the Edited July 27, 2008 by TeamRealtreeHD Quote Link to comment Share on other sites More sharing options...
pabansheematt Posted July 27, 2008 Report Share Posted July 27, 2008 After reading the "Keihin Bible" of jetting, I came across the jetting problem I am having. I have a problem with my 1/4 throttle area. It is boggong and is lazy to get on the power/top end of the motor. It is hesitating so to speak to get on the powerband. So I read this and came across something that I thought to myself... "that is the problem right there!" Here it is... I copied and pasted it DIAMETER: The needle diameter controls the jetting just above the pilot jet, right as the engine begins to pull. On most engine combinations the needle diameter is felt in the Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 27, 2008 Author Report Share Posted July 27, 2008 Matt... I dropped the needle down... or in other words, raised the clip from the 3rd to the 4th slot. It cleared it just a little... nothing noticeable. It stays on the power now instead of dropping off in the higher rpms. It didn't do too much with the lower end problem I described above. Matt, do you think you can help me describe this problem to these guys on here? I tried describing this problem to the best of my ability here. You rode the bike... Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 27, 2008 Author Report Share Posted July 27, 2008 The thing that really sucks is I have nobody to help me here. The shops around here say "I have nowhere to try it out" or "nowhere here can I ride it to help you jet it". And everybody else never went through this. I am really on my own and I have nowhere to turn here. I am pleased with the power ONCE YOU GET ON IT, but it is hesitating really bad in the lower throttle range getting to the power. But once there, it is good. I can clutch it to get it there, but it hesitates using the throttle to get to the power. Quote Link to comment Share on other sites More sharing options...
pabansheematt Posted July 27, 2008 Report Share Posted July 27, 2008 The thing that really sucks is I have nobody to help me here. The shops around here say "I have nowhere to try it out" or "nowhere here can I ride it to help you jet it". And everybody else never went through this. I am really on my own and I have nowhere to turn here. I am pleased with the power ONCE YOU GET ON IT, but it is hesitating really bad in the lower throttle range getting to the power. But once there, it is good. I can clutch it to get it there, but it hesitates using the throttle to get to the power. Tony. I think you said you have a 50 pilot. Did you try a bigger one, If so how did it act. Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 27, 2008 Author Report Share Posted July 27, 2008 I have 155 mains and 50 pilots in. 52 pilots acted the same way. I have 48's too if I ever need them. But the above underlined bold statement from the keihin jetting guide is exactly my problem, wouldn't you agree Matt? Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 27, 2008 Author Report Share Posted July 27, 2008 The main seems on, as the the plugs are a dark brown. And once on the power, it is really awesome running. Taking the CEL from the 3rd to the 4th clip took away the top end hesitation I had. It ran good today other than the 1/8-1/4 throttle hesitation to get on the power. Like I said, the 52 pilot acted the same way the 50 is doing. I have CGL needles in my jet container in the garage. But they are the same diameter as the CEL's. They will do the same thing probably. Quote Link to comment Share on other sites More sharing options...
pabansheematt Posted July 27, 2008 Report Share Posted July 27, 2008 The main seems on, as the the plugs are a dark brown. And once on the power, it is really awesome running. Taking the CEL from the 3rd to the 4th clip took away the top end hesitation I had. It ran good today other than the 1/8-1/4 throttle hesitation to get on the power. Like I said, the 52 pilot acted the same way the 50 is doing. I have CGL needles in my jet container in the garage. But they are the same diameter as the CEL's. They will do the same thing probably. Tony, I still think you a little rich on the main but thats beside the point. I agree your problems with the needles. Try the CGL. Thats whats in mine. Quote Link to comment Share on other sites More sharing options...
pabansheematt Posted July 27, 2008 Report Share Posted July 27, 2008 After reading the "Keihin Bible" of jetting, I came across the jetting problem I am having. I have a problem with my 1/4 throttle area. It is boggong and is lazy to get on the power/top end of the motor. It is hesitating so to speak to get on the powerband. So I read this and came across something that I thought to myself... "that is the problem right there!" Here it is... I copied and pasted it DIAMETER: The needle diameter controls the jetting just above the pilot jet, right as the engine begins to pull. On most engine combinations the needle diameter is felt in the Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 27, 2008 Author Report Share Posted July 27, 2008 I seriously think this is a needle diameter problem. That guide says it to a T. "1/4 throttle bogging and hesitant to get on the power" means too rich of a needle/too thick of a diameter in the needle. I will try the 152 mains I just got and didn't try yet, but this seems like a bigger problem since my plugs are a dark caramel brown with 155's and it runs good in the higher rpm's. Quote Link to comment Share on other sites More sharing options...
pabansheematt Posted July 28, 2008 Report Share Posted July 28, 2008 Matt... I dropped the needle down... or in other words, raised the clip from the 3rd to the 4th slot. It cleared it just a little... nothing noticeable. It stays on the power now instead of dropping off in the higher rpms. It didn't do too much with the lower end problem I described above. Matt, do you think you can help me describe this problem to these guys on here? I tried describing this problem to the best of my ability here. You rode the bike... Best way I can describe it is. It just falls on it's face when you try to ride it. I stalled it 3 times trying to get it to go. no bottom end what so ever. I had to rev it up and drop the clutch to get it to move. Quote Link to comment Share on other sites More sharing options...
wesw Posted July 28, 2008 Report Share Posted July 28, 2008 Matt... I dropped the needle down... or in other words, raised the clip from the 3rd to the 4th slot. It cleared it just a little... nothing noticeable. It stays on the power now instead of dropping off in the higher rpms. It didn't do too much with the lower end problem I described above. Matt, do you think you can help me describe this problem to these guys on here? I tried describing this problem to the best of my ability here. You rode the bike... the bog on the top end is cause your main is too big on the 4th clip. try a 150 the bog at 1/4 throttle open your air screws up a bit see if that clears it up to like 2 turns make 2.5 Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 28, 2008 Author Report Share Posted July 28, 2008 I just swapped out the 155 mains, and put 152 mains in. I also took the 50 pilots out and put 48 pilots in. Still have CEL on 4th clip. I made a few runs behind the house with it. No big change... I made a run with the air screws 1.5 turns out. No change. I made a run with air screws 1.75 turns out... no change. I didn't try 2 turns out, or any more than that. If it is safe to go beyond 2 turns, I will try that. I tried everything that I possibly can. I really miss my 2 into 1 carb non-ported/non-bored motor right now :sad: I guess I can try 2 turns and 2.25 turns and 2.5 turns out on the air screws tomorrow. Quote Link to comment Share on other sites More sharing options...
TeamRealtreeHD Posted July 28, 2008 Author Report Share Posted July 28, 2008 Ok, well I came to 2 conclusions. 3 actually... Since I tried for a full week and a half, I can't seem to get it right. As much as I want to say the money was well spent into porting it, boring it and going to a nice dual carb setup, and advancing the timing, smaller domes, etc.... I really would like to say it was worth it but right now, I am a little disappointed. I am to the point right now that I am ready to sell this thing and watch someone else that knows what the hell they are doing rip shit up with it because they can jet the fucking machine. 1. I can take it to a shop around here, and hope they can get it right even though they tell me they have no rrom to run it to jet it right. 2. I can take it to another shop that I didn't try yet and get raped in price to jet it. 3. Sell it Quote Link to comment Share on other sites More sharing options...
wesw Posted July 28, 2008 Report Share Posted July 28, 2008 dude you need to calm down it takes a bit to get shit tuned. hell im still tuning on my stuff all the time. it just happens. Quote Link to comment Share on other sites More sharing options...
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