Dyno on my Pitbull

[rhinoevans]

Had a really rich condition, fouling plugs on 2002 pitbull K&N filter and V&H 2-2 pipes). Jets were 31 and 70. Dynoed this morning. Black smoke unbelivable on the dyno run. Tuned in at a .295 and a .062. Diffently rides better, also hotter from the motor from the former rich condition.

 

[Gas Man]

Is that a Super E carb?

 

[rhinoevans]

No, it is the G and here are the numbers:

HP= 69.81
Torque= 81.92

Seems low, maybe the V&H pipes???

 

[woodbutcher]

No, it is the G and here are the numbers:

HP= 69.81
Torque= 81.92

Seems low, maybe the V&H pipes???

somethin' ain't right!!!! that is a 107", right.

 

[lee]

the pipes won't help - those numbers do seem low - I thought the 107 was more powerful than the 117

 

[rhinoevans]

yep, 107, maybe just a bad dyno????? I know from riding it is has way more power than my 05 Ultra, whch I think had the same kinda Dyno numbers. Maybe somehow related to the .062 main which seems to me way off what I seem to see on this forum, although most numbers are from 117 motors.

 

[pig pen]

Something is wrong, my 107 pulled 110hp.

 

[CCRainman]

Evans, something is definately wrong because I have an 03 and I pull low 100's in HP and low 100's in TQ with Yaffe pipes. You should get better numbers then me. Your bike is not a EPA bike which should have the 600 cam from the factory.

 

[rhinoevans]

Other than a bad dyno run, is there any other thing I should be looking at since the bike run good??

 

[Raywood]

Other than a bad dyno run, is there any other thing I should be looking at since the bike run good??

Any evidence of clutch slippage?

:flag:

 

[rhinoevans]

NO, not that I have noticed on the clutch slippage. I will go back to the tuner after they get back from Sturgis and ask why the numbers are so low and see if he has any suggestions.

 

[Gas Man]

Yeah I agree with everybody and was thinking that from the begining. Super low numbers and way too low of jet size...

Have you checked the plugs sense then? You don't want to burn up a valve being too lean.

 

[rhinoevans]

Running around 12-12.5 on the Air/Fuel ratio so it is not lean. Really concerned about the main jet. If i get this right from reading this forum, the motor is just an air pump. So if it really requires a jet that small and the a/f ratio is good, then I must have a problem getting air into the motor, right??? Also took it to work this morning, ran great, no popping or backfire, and running it up to 90 MPH as no problem ...had much more to go. Running beter than it even has...still doesnt answer the very small main jet??????? Going back to the shop tomorrow to talk to the owner on the numbers, but DYNO guy left for Sturgis today.


More logic...If the main is right to achieve the air /fuel mixture of 13..then the HP/Torq numbers make sence. Way to low, need to find a way to get more air into the bike.!!!!

 

[rhinoevans]

Air filter maybe have to much oil on it???

 

[beezer]

.062 is way to small---thats an early ironhead size !fuel is being pulled from another source to achieve that air fuel ratio--possible stuck open or bent enrichner or more probable the o ring on top of the accellerator injection tube is missing and fuel is being pulled from the bowl around the nozzle--very likely since the bowl had to be removed to change the int. jet
-BEEZER-

 

[rhinoevans]

We did replace the blue o-ring. I agree with your logic. All I know is that prior to the 062 it had an 070, was fouling plugs, and black smoke and I was geting about 25 - 29 MPG. Way to rich. First DYNO run was off the chart for richness. At that small of a main you would think I would be popping through the carb, but it runs great. Dumbfounded. Maybe a second opinion at a different dyno or throw some more money at it to see what is the problem.

At that small of a jet, you would think that the bike would hardly run (fuel starved). Comment from the dyno guy was that it was so rich (031, 070), he did not know how I was able to ride it. Like I said earlier, lots of black smoke on the first dyno run. He just keep droping the jet size to get the 13 ratio.

 

[rhinoevans]

OK need some advise. I am going to start working on my small main jet and low hp number. Bike still running good and spark plugs perfect, although it does seem a little underpowered from smaller main jet (62). No backfire through pipes or carb so, for whatever is wrong, the fuel/air ratio is corect for current condition.

Here is what I think I know. The cam is a 520 S&S from the factory and the Carb is a G.

Plan of attack.
1. Send carb into XXX for bore and kit mode and replacable air jet mod. And have them see if anything is wrong with the carb.
2. Upgrade to a 600 cam (although I think the current cam should be sufficient for a larger jet and more HP)
3. What should be next??? Help