Re: New member here, Carb tuning pros? I could use your help..thanks

Posted by sbc1320 on Feb 08, 2008; 1:37am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/New-member-here-Carb-tuning-pros-I-could-use-your-help-thanks-tp457529p457535.html

Good looking bike. I rebuilt my 76 with Keyster kits and afterwards mine ran like crap. Knew it had to be the needles, so I put the stock needles back in and it ran just like it did originally. Originally it ran good, but it had a flat spot in the throttle right around cruising speed (50-55 mph) where it would just kind of sputter. Never missed out and would run good if throttled on. After verifying that the Keyster needles were the culprit, I then took the needles back out again and put the clip back in the Honda default position in the middle groove. My bike runs so much better and crisper now than ever before. I am suspecting that the previous owner moved the needles about 15 years back when they installed the 4-1 header. My bike was running very rich before, but its so much better now. I also jetted it back to the 105 factory jetting since I have my baffle in. If I can get the baffle out, I will probably put the 110's back in there and try it. As far as cold cranking mine, I give it about a 1/4 throttle and with the choke on then crank it. They will have to warm up a bit to idle correctly as the motor is not efficient until it gets to operating temps, especially with the aluminum head. When it is really cold (30-40* outside), I leave the ignition off and choke the bike with the throttle open again about a 1/4 throttle and kick start about 3 times, then I turn the ignition on and kick one more time and she will fire right up. I can also use the electric start if I want to. Mine has a throttle lock lever (aftermarket) and I use it to hold the throttle around 2000 rpms to warm it up. I usually feel the engine cases by the generator to verify its warmed up before revving it up very high. Didn't mean to right a book, but I hope this helps you. Again you have a great looking bike and good luck with it.