Topic: MotoGPWerks Pipe CB550 (Jetting and video)

[riverfever]

I just deleted all the pics I had while doing the clear tube off my phone. This is damn near where all of mine ended up. I think I finally had the floats set at 27mm but I really had to mess with #4 to get it the same as the rest. I just forgot about measuring it and kept making adjustments until I finally had it inline with the others. What was interesting was that all last summer I ran on three cylinders (1-3). Like I said in my thread...this is the first time 4 has hung in there. I probably have 30 plugs laying around.

[Tews19]

I'm at 12 plugs as of today alone. Is it possible to make a video of it running and when you hit the flat spot? I'm almost positive we have the same issue going. Today mine was so rich the bike was bogging down. But as you stated, if you stay on the throttle it will take off after the bogging down.

[mrfish2]

Interesting. I'm fouling the #$%* out of these. Bought 3 new sets of plugs. Rode to a place where I could do a plug chop. My slow jets need to be swapped out. Way to rich. May have to order a.set of 40s. Running 42 now.

Why not go back to the stock 38's? From what I've read from other threads as long as the air induction system hasn't changed (i.e. stock airbox vs pods) then you shouldn't need anything other than stock size idle jets.

[riverfever]

Mine's not doing it nearly as badly now after messing with the needles again but I thought about trying to get a video. If it's not raining or snowing when I get home tomorrow I'll try.

[riverfever]

Isn't 40 stock?

[Tews19]

38s are stock for 069a carbs.

[gregripko]

Best setup for me was to keep slow jet at #38 and just upped the mains to #105... Runs good

[riverfever]

The huge difference for me is that I live at 8500' elevation so the motor was stupid rich to begin with. Where most have to up the jets, I've had to think the opposite but I'm finally getting close.

[Tews19]

Now I am chasing issues. Now I have what some have described as when letting off the throttle it will die if I and riding. Actually even when i pulled back into my garage. I gave it a good throttle twist and once the rpms dropped the bike died. I installed the 38s and it idles well. The bogging isn't as bad as prior. No popping on decel. I need to find the thread of the person who did the 605 kit and what their settings are. I did get 110s so I am going to order 105s

[flybox1]

so with the 38's, does your bike still die when you let off the throttle?
your last post wasnt clear if the 38's cleared it up.

your WOT plug chop should have been the first to be done.  did the plug color indicate a change to 105's?

[Tews19]

Yep. I did as you stated. Went with 2 sets of fresh plugs. Drove out to get to operating temperature. Swapped 1 set of plugs. Bike ran like cap on the 1/4 and half way. Part that makes me concerned is rereading this thread. Gold dude posted 110s and 38s were great. I've yet to see it but I will try to get one more ride in and another plug chop. I got it to wide open throttle w new plugs. Hit the kill switch and checked the plugs. They were still sooty.

[Tews19]

Another kick in the nuts is that Sirius has only 3 105 mains! Lol. This may be on hold for a while.

[flybox1]

hit up jetsrus.com.

[Tews19]

Duh, I forgot about them. Order just placed. As Lucky stated many times though how does the main jet effect the low end stumble?

[joeyvans]

Another kick in the nuts is that Sirius has only 3 105 mains! Lol. This may be on hold for a while.

Because of this thread, I have 105's from jetsrus ready to rock after my carb cleaning. Hoping they are the ticket for the MotoGP install so I don't have to do much messing around. I'm running 087a's in which stock mains are 100. Curious, what are your stock mains, Tews? I see you and I are at about the same elevation.

[flybox1]

Duh, I forgot about them. Order just placed. As Lucky stated many times though how does the main jet effect the low end stumble?

overlap.
once you hit 1/4  throttle (and above) the main jet begins to pull fuel from the bowl.

[Tews19]

Stock mains for 069a carbs are 98. I have 110 now. I thought 110 would be the key due to me boring out the 550 to 605 and the 650 cam.

I will continue this process. Also I have a Dyna electronic ignition. I set it at 2500 rpms per Dyna suggestion. Could this be a culprit to low end running poorly?

[calj737]

My opinion: you're too rich due to 110s and your fuel level. The last picture you showed appears to have the fuel very high, in my opinion.

[Tews19]

I'm thinking the mains need to be dropped to 105. Maybe my fuel level is to high. It doesn't spew out though.  Hopefully I get the mains before surgery. Once surgery the bike maybe on hold for a few weeks.

[flybox1]

The 3-4 mm fuel level information was passed on to me by Hondaman, years ago when working on my 350F
He indicated it was a level standard across all SOHC Honda CB's as it adequately covers all jets during any riding situation.
Once remedied on my 350Fs carbs, and on my current K8F's carbs, the bikes ran as expected, so I have no reason to doubt the information.
My levels as of last Friday

[joeyvans]

The 3-4 mm fuel level information was passed on to me by Hondaman, years ago when working on my 350F
He indicated it was a level standard across all SOHC Honda CB's as it adequately covers all jets during any riding situation.
Once remedied on my 350Fs carbs, and on my current K8F's carbs, the bikes ran as expected, so I have no reason to doubt the information.

Remind me, fly.... Does the 3-4mm refer to 3-4mm below where the bowl mates to the body?

[flybox1]

Remind me, fly.... Does the 3-4mm refer to 3-4mm below where the bowl mates to the body?

Yes

[Tews19]

When I adjusted the floats for more fuel I will say there was no hesitation when up in the rpms. I will keep them for now and swap to the 105s first then go from there

[Tews19]

I can't just sit around if i know I can putz with my bike. I went back to 2.5 turns with the air mixture screw. Now there is no hesitation at all? Actually drives pretty freaking awesome. I will do a plug chop but most likely won't be until tomorrow. It does smell a bit rich so I am thinking of swapping out the plugs and putting in new ones before I take a ride. the 105's should be here by Saturday and if that ends up being when they do the bike has to sit for a week.

[flybox1]

Yeah...i have the same desire to ufck with stuff while waiting for parts to come in 
Wait to make any other changes to your carbs until your 105's come in.  Because the main jet starts to pull fuel early in throttle position, any mixture changes you make now wont be valid once you get your 105's in. 

There's always something to clean, or electrical to make (look) cleaner (wire run tubes, shrink tubing, etc)