Still a midrange stutter!

[wobbleknobble]

I just got back from our annual Good Friday ride, bike run great just still have that midrange stutter that seems to be there until you either ease off the throttle some or mash on it to clean it out and it will run fine for several minutes and when riding at a slow pace in technical stuff for a few minute she stutters in the low midrange, once up to 1/4-1/2 she runs flawless. I checked the plugs several times yesterday after riding in different condtions, plugs seems right on the money after a fast pace section or hillclimb, midrange seems good also slow riding or idling gives a black wet plug. 280 mains, 25 pilot, air screws at 1.5, needle on second clip from top. I have tried a 27.5 pilot she run good only if you backed air screws out to 3 turns. I have also played with needles, runs better on that leaner second clip. I am running Belray H1R at 50:1. K+N filter, lid on no snorkel, elev 1060ft. Is it possible that a rich main could effect lowend? Reeds getting weak? She pulls hard to top with no flatspots, plugs have always read a little rich.This lowend stutter has always been her I just would like to make it better for me. My old shee never had this problem with same setup although I was running Bills pipes on it instead.

[sredish]

try raising the needle a clip or two.

[wobbleknobble]

I have moved the needle from the stock to the fourth clip she run worse then went up to the second clip that help for the most part just a little hint left when cruising the tight area and when you open her up in the straights you either wait for her to clean out by stuttering for a couple seconds or clutch her and take off. Any more suggestions?

[letsgetthisdone]

its sounds to me that you aren't keeping it in the powerband

[wobbleknobble]

I try to keep her in the band most of the time but those pesky 450 fourpokes keep getting hang up in front of me. I do a lot of hillclimbs that have section where you have to get out of the throttle or crash into a tree or the back of those fourpoke guys. I would like to get tuned in were leftting off and then getting back on is right there not that stuuuuuuuuuuuuuuuttttttttttter that I get, I then clutch it and jump about 20 yrds in whatever direction the bike wants or wheels spin like mad, both is not fun on a 100yrd climp that goats cannot stand on.

[letsgetthisdone]

OK, Pual Turner Mids (bottom end pipes), a wood port, 4 mil stroker (and the various bits it requires), cool head, single 35mm carb, and as much compression as the gas you are willing to buy can handle. This will pretty much solve the problem, but then you will lack top-end power.

 

If you let off the gas going up hill on a shee it is goin to fall of the pipe. You could try modulating the clutch and throttle instead of just droppin the clutch and floorin it, but that'll smoke every clutch you put in in about 6 months.

 

You could also try passing the 450's in the open sections of trails, then you don't have to worry about hittin 'em in the tighter sections.

 

Its not a jetting issue IMO, it is just falling off the pipe.

[jbooker82]

I would try turning the air screws out another .5 turns. or maybe a little more. If it starts to run good and your over 3 turns out you need to go down a size in the pilot jet and re adjust the air screws.

[wobbleknobble]

I took the advise on the air screws, I turned them in to .5 out and rode some it was worse, I kept doing this .5 turn at a time until I got out to 2.5 out and the stutter is gone. I rode her hard wide open and pulled plugs, dark tan, rode in midrange for a bit pulled plugs tan still, after riding slow the plugs were black so I kept adjusting the air screws until smooth now have a dark tan after slow cruising and going through technical stuff, plugs still real dark after idling but that is ok to me. As I mentioned before my current jetting is now 280 main, 25 pilot with air crews at 2.5, needle second from top. This is a lean setting compared to other Banshees I have had. Is it possible that reeds are soft? Or that 50:1 fuel mixture but I run the same oil in other bikes. She pulls hard and does not give me any problems, just don't want to burn down. I felt like she pulled harder with the 27.5 pilot but was rich down low as well as trying the fourth needle clip as some have mentioned. As long as she is running good and not showning to be lean I should be Ok, Oh yeah its around 50 degrees and what effect while the warmer weather do to my midrange and pilot? I feel like 2.5 turns out on that 25 pilot is lean but plugs show otherwise.

[jbooker82]

Glad that took care of it for you.

 

Is 25's the stock pilot size in the banshee? Sorry for the dumb question but I have never had a banshee that had the stock carbs on it. It has always had Keihins.

[wobbleknobble]

Yeah it still has the stockers and the 25 pilot is stock. Factory setting on air screws with 25's is 2 turns out,but that is if you still mix the gas 20:1 or 24:1 as the manuel calls, I'm running the BelRay H1R at 50:1.I have used this oil for quit a while and on a few Banshee's and several bikes no problems as for as oiling, This bike I'm working on has been sitting for several years, It's an 2001 and stock save for pipes and K+N, no snorkel. The carbs were very dirty and I replaced the rings even though the stockers looked good and gave good compession. I was just concerned about the lean settings on this bike to get it to run properly.