950 Trouble

[motozilla]

Okay.....disconnected the EPC. did the Sommers air box mod, added Remus slip ons and did the carb jet mod. 3rd slot from top, 4 turns out on the pilot. Runs like shit!!!! Now what???? Won't spin up freely under load. (Seems fat) Pops badly on off throtle decel and even between shifts. (seems lean) This sucks!!! Any help would be apreciated. I'm in PHX at abut 1100 feet of elevation.

[Renegade6]

1) Make sure the caps on top of the carbs (that the EPC used to be connected to) are completely sealed otherwise you can't build a vacum that will raise the slides when the idle circuit shuts off.

2) Also, make sure that the carb vents lines aren't kinked, as they exit the airbox.

Sounds more like #1.

[motozilla]

Originally Posted by Renegade6

1) Make sure the caps on top of the carbs (that the EPC used to be connected to) are completely sealed otherwise you can't build a vacum that will raise the slides when the idle circuit shuts off.

2) Also, make sure that the carb vents lines aren't kinked, as they exit the airbox.

Sounds more like #1.

OOPS! I vented those. That makes perfect sense too because that was the feeling as I pulled on the throttle. Still too lean on the pilot though even 4 turns out. I guess I'l come two more turns out and see if it helps.

[Renazco]

Might have to drill out for jetting, I believe "Factory racing" might have put a kit together already for this, worth a try.

[markjenn]

Hate to be a nay-sayer, but what problem are you trying to fix? You can really hack up your bike if you start just making wholesale changes based on "hot mods" you pick up on the net. I'd try and get most stuff back to stock and then go from there, making small incremental changes one-by-one. A dyno is the preferred way to do this, but you can get by with the seat of your pants.

- Mark

[motozilla]

Originally Posted by markjenn

Hate to be a nay-sayer, but what problem are you trying to fix? You can really hack up your bike if you start just making wholesale changes based on "hot mods" you pick up on the net. I'd try and get most stuff back to stock and then go from there, making small incremental changes one-by-one. A dyno is the preferred way to do this, but you can get by with the seat of your pants.

- Mark

I agree and I thought that was what I was doing. First I installed the slip-ons. After that it popped on closed throttle decel. I changed the needle position and fed in 1.5 turns more fuel on the pilot jet. I also opened up the airbox and elimintaed the EPC. I think that's where I went wrong. I vented the EPC carb connection instead of blocking it off. So now it act as though it's on all the time preventing proper vaccum to build in the carb diaphram during acceleration. I'll fix that but I'm still stymied on the decel popping. More pilot adjustment I think...????

[Renazco]

Originally Posted by motozilla

More pilot adjustment I think...????

Might have to bore those pilots, very tricky! I would call Gato88 he's got that thing dialed in on the pilot jet area.

[AZcacti]

Good luck Paul. I hope you get your tubes and screws all dialed.

BTW, It's too FREECKEN hot for bicycles !

Small world isn't.

[Renegade6]

Originally Posted by motozilla

I'm still stymied on the decel popping. More pilot adjustment I think...????

I think the a lot of the deceleration popping comes from the Secondary Air System, it pumps fresh air into the exhaust. Due to the fact that you have removed your cats, you can probably disable that as well.

[motozilla]

Originally Posted by AZcactiRider

Good luck Paul. I hope you get your tubes and screws all dialed.

BTW, It's too FREECKEN hot for bicycles !

Small world isn't.

That hill we just came up sucks!!! That beeeotch is 10 miles long. I saw you go by and I knew it had to be you so I hustled up the the light. We were just out for a "quick" 90 miles and yes it was hot! I went through 6 bottles of water is 5 hours.

[motozilla]

Originally Posted by Renegade6

I think the a lot of the deceleration popping comes from the Secondary Air System, it pumps fresh air into the exhaust. Due to the fact that you have removed your cats, you can probably disable that as well.

Where does the SAS pump air back into the exhaust???? I though it pumped it into the airbox.

[KTMax]

I think the carb tops are the main suspect here. One or both the holes where the hoses used to be must be open or leaking.

Is the choke still working correctly BTW? Maybe with the removal and installation of the carbs something went wrong there.

Popping on a closed throttle should be there but not excessive. With stock cans my bike popped and with Akra's it still does. It has been setup perfectly at 4.2% CO level. It must pop a little. With more open silencers like Akra's or Remus cans you'll hear it a bit more. By the time you 'dialed out' the popping the idle circuits are way too rich for sure.

I think you should wait with mess'n things up further by drilling pilot jets etc. There is really no need to do this.

[Renegade6]

Originally Posted by motozilla

Where does the SAS pump air back into the exhaust???? I though it pumped it into the airbox.

Check out this thread: http://www.advrider.com/forums/showt...ht=950+service

From the looks of the post, it goes into the heads. Also, if you have the service manual, look at page 2-4.

[motozilla]

Originally Posted by Renegade6

Check out this thread: http://www.advrider.com/forums/showt...ht=950+service

From the looks of the post, it goes into the heads. Also, if you have the service manual, look at page 2-4.

Thanks Brandon! It all makes sense now. I got carried away with the spaghetti removal.

[Renegade6]

If you want an idea of what the block off plate would look like, look at the front page of your engine parts manual. On the right cylinder you can see the connection in the center. Probably could just make a plate out of flat alumimum.