Jump to content


Member Contributer
  • Content count

  • Joined

  • Last visited

  • Days Won


MadScientist last won the day on February 8 2016

MadScientist had the most liked content!

Community Reputation

167 Great

About MadScientist

  • Rank
    Factory Team Commuter
  • Birthday 07/01/1981

Profile Information

  • Location
  • In My Garage:
    98 VFR
    06 599

Recent Profile Visitors

8655 profile views
  1. MadScientist

    Throttle bodies interchangeable?

    Two potential mechanical culprits this sounds kind of like: 1. Vacuum leak - those lines are almost 20 years old. When I rebuilt mine there were a few questionable looking lines. 2. Fuel Pressure Regulator - the internal vacuum diaphragm and gaskets break down leading to fuel pouring through the vacuum line and into the #3 cylinder throttle body. Could be electrical gremlins or dirty injectors. Additionally, if the bike sat for some years, there may have been rust in the tank that subsequently plugged up the in-tank fuel filter. I'd lay off the O2 sensors for now. Eliminating them may identify the O2 sensors as the culprit, but it may also make diagnosis more troublesome.
  2. I don't know if this play is going to work, but HD has to do something. They basically just sell one type of bike in about 20 variations, but they are all still "cruisers". I'm interested to see how the "streetfighter" will do, considering the bikes it is supposed to compete against "...the likes of the Aprilia Tuono, Ducati Monster and BMW S1000R" carry a massive advantage in prestige and refinement in the sector. HD better be prepared to sell at bargain basement to get a toehold, because nobody considering one of those 3 bikes is going to pay a premium just to have H-D on the tank.
  3. MadScientist

    What other chain guards fit 5th gen swingarm?

    I can confirm that the skidmarx hugger has a smooth top, however it has 3 small holes to mount the brake line brackets. These can be easily plugged with plastic automotive plugs or ignored. I used plugs that look like this:
  4. MadScientist

    Dynojet Autotune repair. Burnt Diode S1G

    I just noticed R19 is missing from the bottom(?) side of the board, there may not have been a resistor installed at that position though. Check out the solder pads for evidence of broken solder and maybe check in the potting material to see if it got stuck upon removal. R64, R65, and R68 appear to have virgin solder pads, so I think they were not installed. This is somewhat common, I would bet they are populated on different versions of the board. I assume you know a diode allows directional control of current flow. You may have to try both orientations when you replace it, unless you were able to determine the direction of the original diode. Thanks for the pictures!
  5. Kev, did you replace the radiator cap? Pressurization of the cooling system leads to higher coolant density and better heat transfer. At least it's an easy swap...
  6. MadScientist

    Anyone installed the delkevic headers?

    The merge collector looks nearly identical to that in the 5th gen and 6th gen kits. It is not really a performance oriented design, if that is your goal. You might save a little weight by dropping the catalyst, but I don't think I would bother unless your OEM headers are damaged in some way.
  7. My usual engine temperature for cold weather riding (<45 F) is 168 F. If the outdoor temperature is above 60 F, I rarely see engine temps below 180 F. This is with a brand new $30 price gouged OEM t-stat.
  8. MadScientist

    Dynojet Autotune repair. Burnt Diode S1G

    Great job removing the coating from the board, it usually doesn't come off very easily. You will want to replace the burned diode with another to provide the same reverse current protection of the original. I HATE soldering SMDs, especially semiconductors and capacitors because the heat of the soldering iron can easily damage them. If you don't have a flux pen already, you might want to consider getting one. Putting a light coating of flux on the terminals of the diode and the PCB will encourage the flow of solder into the joint and reduce the time the components are exposed to heat. The other method I use is to melt a tiny amount of solder onto the pads, place the component on top and hold it in place as I re-melt the solder on the pads. I'm sure DynoJet is not thrilled that you got the potting/conformal coating off the board. I wouldn't mind some more detailed pictures of the front and back of the board, if possible.
  9. MadScientist

    Penske shock for $50???

    Don't know about current ownership, but it looks like they started out that way. https://www.penskeshocks.com/about-us/
  10. MadScientist

    Gen 5 PCV/AT surging

    Just to make sure, you have O2 sensor eliminators right? I assume you are using one of the existing holes for your autotune sensor as well so, is it the front or rear and have you tried using the other location? I've been running it for years, so I assume my F/W is not updated. Also when do you notice the surging (steady state, accel, after decel)?
  11. MadScientist

    gen 5 vs get 6 brakes

    Having torn apart quite a few brake systems of varying age during my project, I wouldn't use anything from the wreckers without rebuilding it. Once they pull off the system it is no longer sealed up reasonably well and water from the atmosphere will make its way into the brake fluid. Even the rear brake off a 2014 8th gen had evidence of corrosion and deposits in the caliper and seals. You never know how long that stuff has been sitting open to the environment and slowly rotting at the breaker. If you are going to de-link you will still need to address the lower fork tubes, since the left side mount has an integrated master cylinder. It's your prerogative to use parts from the breaker without rebuilding, but I wouldn't screw around using parts of unknown internal quality from a junk yard. It's your ride and all but my advice is to do the de-link the proper way or just rebuild the 5th gen setup.
  12. MadScientist

    FI light stay on ?

    Your computer has recorded trouble codes, most likely something didn't get plugged back in. First: Download the manual Second: Refer to section 5 page 7 (5-7) to read stored codes. Count the flashes then refer to the table on 5-11 through 5-13 to interpret the codes. If you are having issues deciphering the code, feel free to post a video.
  13. MadScientist

    Power Commander Autotune MAP Switching

    The switch I have looks very much like this: https://www.amazon.com/Superior-Universal-Adjustable-Vacuum-Switch/dp/B00BZODN9A/ref=sr_1_1?ie=UTF8&qid=1525878540&sr=8-1&keywords=adjustable+vacuum+switch Might be the same, but has been a few years now. People use them to set lockup of automotive automatic transmissions. Vacuum pump is perfect. I actually used the gauge on the vacuum pump to measure engine vacuum on overrun, just taped the whole thing to the dashboard. Sorry, I don't know what the original ID is, but the end measures about .16" so I would guess it was 1/8. Could be metric too, so like 4mm. End was a little stretched out from being over a fitting.
  14. MadScientist

    What octane fuel are u using on your VFR?

    The old PC2 had the ability for you to program in some additional ignition advance (I think max +4 deg). Even doing that with a custom map was not worth the justification in extra fuel cost. Was only worth a couple extra HP up top and barely noticeable on the street.
  15. MadScientist

    Power Commander Autotune MAP Switching

    You can use both features - enable autotune once the bike hits about 160 and use the manual switch inputs to disable autotune under closed throttle. I would say the easiest way to disable autotune under closed throttle is with a vacuum switch. Here's how I did it: First I used a vacuum gauge temporarily mounted onto my dash, tapped into the vacuum lines off the throttle bodies, to determine the vacuum under overrun conditions, I've long since forgotten the actual value. You have to ride the bike on the road to determine this, it can't be done in the garage. Second, use a handheld vacuum pump to set the switch point on an adjustable vacuum switch to just slightly below the lowest vacuum reading from step 1. Most adjustable vacuum switches have 3 terminals - one is common (COM) and the others are either normally open (NO) or normally closed (NC). You want to use the NC side so that when vacuum exceeds our setpoint, the contacts are open. This will require a test light and a power source; or multimeter. Just to be clear your are testing continuity between the COM and NC terminals, we are setting the vacuum at which point continuity is broken. Using the same point that you tapped into vacuum in step 1, attach a vacuum line from that point to the vacuum switch. Wires should connect from the power commander to the COM and NC terminals. Now when your throttle is closed under overrun, the vacuum increase causes the switch to open and autotune to cease. Just to note you need a vacuum switch with a setpoint range from approximately 10-25 in Hg. This could be done with a MAP/vacuum sensor but you would need to know the operating characteristics of the sensor then send that output into a voltage comparator. Output from the comparator feeds a relay that does the switching. Way more complicated and subject to voltage fluctuations of the electrical system of the bike.

Important Information

By using this site, you agree to our Privacy Policy.