Do You Think 280 Is Too Lean?

[erbilabuc]

ok I am down to my last ounce of castor 927 and I cant wait to get rid of it, I might just pour it out. Ever since I started using this stuff my shee has ran like crap. I used to use the 3$/quart stuff and it ran great and never gave me any problems. Ive noticed after the 927 that its harder to start, oil comes out of silencers and it doesnt pull in 2nd gear(when drag racing it just bogs after clutch is dumped) like it used to. Should I go back to the low level stuff and see what that does or stick a 280 main in it because from like 0-3/4 it bogs

 

pilot is at 25

main is at 290

needle in 2nd spot from the top

 

sst's, v force delta 2's and advanced timing 4 degrees, running stock carbs with pro flo and no lid and I am at sea level.

 

 

thanks

[bkabina]

I have run castor 927 for a long time with no troubles.Maybe you should try playing with the jetting some and see what happens.

[Lepew]

Why would you richen the main and pilot and lean the needle with your mods? your main only effects the top. your needle runs the middle.

[erbilabuc]

Why would you richen the main and pilot and lean the needle with your mods? your main only effects the top. your needle runs the middle.

you didnt read it right, i leaned the main, the needle and pilot

[Lepew]

pilot is at 25

main is at 290

needle in 2nd spot from the top

 

Your pilot is the stock size. I was wrong I couldn't remember what came original. Your main is close. Your needle if the clip is in the second groove from the top (the way it sits in the bike) you have leaned it from stock. I am assuming your bike is original except for what you listed. With pipes, filter and no airbox lid the clip on the needle should be move to the forth groove. Before you go messing with the jetting go with everything you had when it ran right. The same gas/oil and jets and put a new set of plugs in. Then see where your at. Sometimes when they are hard to start they just need a set of new plugs.

[erbilabuc]

pilot is at 25

main is at 290

needle in 2nd spot from the top

 

Your pilot is the stock size. I was wrong I couldn't remember what came original. Your main is close. Your needle if the clip is in the second groove from the top (the way it sits in the bike) you have leaned it from stock. I am assuming your bike is original except for what you listed. With pipes, filter and no airbox lid the clip on the needle should be move to the forth groove. Before you go messing with the jetting go with everything you had when it ran right. The same gas/oil and jets and put a new set of plugs in. Then see where your at. Sometimes when they are hard to start they just need a set of new plugs.

you are totally right, i should of never even tried to rejet it, im going back to the old oil and see what that does.

[spoin39]

No matter what oil you have you need to go up to at least a 320 with no lid and a K&N filter. Is the needle 2nd from blunt or pointed end?

[Banchetta]

I'd say you culprit is the needles...move them to the 4th clip from the blunt end...also try adjusting the air screws, that'll help a lot too. most likely they will like to be at .5-1 turn out from seated...you should notice a huge difference.

[Meat]

You guys are nutz messing with that needle clip. leave it in the stock\middle\3rd notch. Moving that clip one notch represent a huge change in your jetting and it does effect your main jet jetting also. So once you start moving that needle clip, forget about standard recommended main jet numbers, your gonna have everything fucked. Aftermarket needles come with a little washer that you put under or on top of the needle clip so you effectivly double the amount of notches on the needle. This allows you to make needle clip adjustments in half notch increments instead of huge full notch moves.

 

Read this page on jettingMotorcycle Carburetor Theory 101

[Ducman]

I have FMF Gnarleys and the SST's even though they have a diferent power delivery, jet similarly, so my set up (see signature now 2 turns out on air screws) may help, I'm also near sea level at about 50 deg. F. I have a foam filter, I'm not sure if you mean foam or K&N when you say proflow, but if your foam then 290 should be ok on the main possibly 300 since you have the timing advance. 320 to 330 if K&N You should have your needle in the stock clip or possibly one richer. Turn your air screws in after it is good and warmed up, if it idles better and has better throttle responce off idle the more you turn the screws in untill thsy are all the way in the you need to go up one pilot size. I think the pilot along with the needle may be your problem. Trying the old oil and new plugs first couldn't hurt though.

[Banchetta]

You guys are nutz messing with that needle clip.  leave it in the stock\middle\3rd notch.  Moving that clip one notch represent a huge change in your jetting and it does effect your main jet jetting also.  So once you start moving that needle clip, forget about standard recommended main jet numbers, your gonna have everything fucked.  Aftermarket needles come with a little washer that you put under or on top of the needle clip so you effectivly double the amount of notches on the needle. This allows you to make needle clip adjustments in half notch increments instead of huge full notch moves.

 

Read this page on jettingMotorcycle Carburetor Theory 101

???? I run mine in the 5th notch from the blunt end......I have no problems w/ jetting..... You just have to find the best combo for your bike....

[sredish]

and in some cases you go up in the needle, you can back the main off a size or two and that will help with the smoothnes of the transitions between the jets.

 

Here's a little diagram to help:

 

[wesw]

im run 360 with my combo at 1000 ft runs like a top