My awsome 426 starting to smoke
Posted October 03, 2006 - 06:59 PM
I am a woods rider and I have become quite fast as this bike and I work well together. The last couple of rides I have started to notice some white smoke more so when cold or under heavy accel. Maybe a slight loss of power.
I am meticulous with my maintenance. This bike has always started in one kick never hesitates, bogs or surges. I don’t even remember what jetting I ended up with as it has been flawless.
I am looking at the 444 big bore kit and I am somewhat hesitant as I do not want to end up with all kinds of drivability problems. I am spoiled with my now tired machine.
I think I would like to upgrade the power, what do you guys think? I hate to take it apart and not give her a little something. I guess I need to know the power difference and how I would need to jet it as I am so spoiled with how it runs know. Any thoughts would be most welcomed. Thanks.
Posted October 03, 2006 - 10:06 PM
Posted October 05, 2006 - 07:16 AM
I have done all of what you are concerned about. I have an 01 426 with some motor work. I too was afraid that I would lose bottom end and it would become peaky like a two smoke. I was pleasantly surprised to find out that with a larger piston the motor is even better than before. When I bored the cylinder I also put in a set of hot cams and had the head ported. All of these mods really made the motor scream without sacrificing any bottom end power. I still ride single track, Baja and desert race and can't be happier with the mods I did to the motor, it works great everywhere. I wouldn't go with the high comp piston because then starting is harder and running Mexican gas is nearly out of the question.
As for jetting.... This was the most confusing part of the entire modification. I ended up going to smaller jets both on the main and pilot. I use a 168 main and 42 pilot. With the head work, cams and larger bore the motor actually acted as a larger pump therefore pulling more fuel through the same jets. I would presume that with just a larger bore and stock cams and head your jetting would be nearly the same. Nothing trial and error couldn't figure out.
If you have specific question PM me, I'm more than happy to share what I have done to my bike.
Posted October 05, 2006 - 01:05 PM