Hot Hot Hot
Posted July 10, 2003 - 02:29 AM
Posted July 10, 2003 - 05:34 AM
I guess its payback time for being able to enjoy riding all winter long. Yesterday I was out practicing for an upcoming race and it seemed unbearably hot. I stopped by a friend's house on the way home and happened to catch the news, record high of 117°F in my little town just outside of Las Vegas. "Its a dry heat" that made me feel like either passing out or puking all over the inside of my helmet. So here's to all of you that were stuck staring at your bikes all winter
I hear ya, I live outside Phoenix and dang it is just too hot to ride.
Posted July 10, 2003 - 09:22 AM
How do you like your jetting for the weather and altitude you are in? I ride in a similar climate and elevation, but, not as hot (around 90). With your needle EJP-4, do you get an stumble at constant throttle, just off 1/4 throttle? I have the jets you are running plus the PAJ(s). I like my needle at EKP-4, but, I get that stumble off of 1/4 throttle. I am wondering if setting the PAJ(s) at 100 would help that. Any feedback appreciated.
Posted July 10, 2003 - 06:12 PM
Posted July 10, 2003 - 07:43 PM
I like my needle at EKP-4, but, I get that stumble off of 1/4 throttle. I am wondering if setting the PAJ(s) at 100 would help that.
Souns like a PAJ issue to me, although your setting of 85 should work well with a 40 pilot. What the heck, go out to 90 or so and see what happens. Generally speaking, surging at constant throttle means too large on PAJ, and stumbling can be indicative of too small on PAJ, provided your throttle response is good at lower rpms.
It is either that or your bike wants a smaller straight, like an EKQ.
How restrictive is that WB Silent Insert? In my experience more restrictive exhausts like leaner pilot settings. Hmmm.
If it were me I'd probably tweak my fuel screw first, just because that is easy and needs to be ruled out first, then I'd try a larger PAJ, then I'd try the different needle.
Here's a Yamaha PN for an EKQ: 5JG-14916-E1
Hope this helps.
Posted July 11, 2003 - 08:14 AM
Posted July 11, 2003 - 01:15 PM
I want to see if I can get rid of the stumble with the jets and keep the rich needle setting. What do you think?
Hmmm. Like always, it is hard to say without riding the bike.
At 1/4 throttle you shouldn't be on the taper yet, so I don't think it is clip position. Having said that I've never measured exactly where this point is, it is so easy to pick it up when you are riding, of course where the clip position is obviously affects where the taper is with respect to the slide.
I think you could be rich on the straight.
If you want to risk the twelve bucks I say buy the EKQ, and leave everything else the same. The different straights (Q vs. P) have a fairly pronounced affect on throttle response and low-throttle cruising.
Hope this helps.
Posted July 12, 2003 - 04:44 PM
ps. The zip-ty fuel screw (or similiar) is a wonderful tuning tool for subtle air density changes.