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Thread: Popping

  1. #1
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    Popping

    I recently purchased a 2004 r1150rt-p with 48,000 miles. The man I bought from got it from the WSP online auction about a year ago. He knew nothing about BMWs and thought the bike was in perfect condition. It was not, but I did not think there was anything seriously wrong and the price was right so I purchased it. My friend and I (he's an A&P and has 3 BMWS) did fluids , brakes, and valves also did throttle body sync put on new steel quick connects and changed plugs. The difference is amazing. I have 2 issues. One is popping on deceleration and the other is a top speed of 109 mph. I have checked the speed on two occasions and in both 5th and 6th gear. Top speed is always 109. Any help would be appreciated.

  2. #2
    Registered User roger 04 rt's Avatar
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    Re: popping, is the exhaust stock? Check for air leaks if it is.

    Re: top speed, possibly your in-tank fuel hoses are leaking keeping fuel flow low. You can measure the volume of fuel returning from the fuel distributor at idle. If it is 2 liters per minute you're good.

  3. #3
    Registered User dieselyoda's Avatar
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    I don't think any of my bikes goes above 109 mph, including the k1100RS I just sold. The rev limiter on my R1100RT seems to cut in sooner than I would like as well. It could be the way it is. Keep in mind, that I live in Canada and the max legal speed limit anywhere is barely 70 mph and in almost any jurisdiction in Canada, getting caught 20 mph over the speed limit will result in very significant fines and if a Yellow Stripe is having a bad day, it could be a criminal charge.

    I don't test my max speed very often.
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  4. #4
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    Yes the exhaust is stock. Thanks for looking

  5. #5
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    Top End

    5th and 6th are limited in miles per hour. 4th gear isn't. Unhook the battery for an hour, hook it back up, try red lining the bike at full throttle in second gear
    to clear the crud out of the engine. By full throttle I mean crank it back as far as it will go as soon as you shift into second and hold it there until it red lines.

  6. #6
    Left Coast Rider
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    Quote Originally Posted by dieselyoda View Post
    Keep in mind, that I live in Canada and the max legal speed limit anywhere is barely 70 mph and in almost any jurisdiction in Canada...
    For the record, the speed limits in many areas of BC have recently been raised, some to 120 km/h (75 mph).

  7. #7
    Registered User dieselyoda's Avatar
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    Quote Originally Posted by BC1100S View Post
    For the record, the speed limits in many areas of BC have recently been raised, some to 120 km/h (75 mph).
    Where??
    1997 R1100RT, 1981 KZ 440 LTD, R80RT, R90/6 sidecar, K1100RS,1983 K100RS (Cafe now)

    “The major civilizing force in the world is not religion, it is sex.”

  8. #8
    MOA #24991 Pauls1150's Avatar
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    an RT-P is "limited in miles per hour"???

    Very difficult to accept...

  9. #9
    Left Coast Rider
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    Quote Originally Posted by dieselyoda View Post
    Where??
    Hope to Merritt. Merritt to Kamloops. Merritt to Kelowna. All are 120 km/h.

    Speed limit from Abbottsford to Hope was raised to 110 km/h. As well, there are a number of other roads which have had their limit raised.
    Last edited by BC1100S; 10-04-2015 at 12:58 AM.

  10. #10
    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by Pauls1150 View Post
    an RT-P is "limited in miles per hour"???

    Very difficult to accept...
    Slower, so the cops can't catch crooks n

  11. #11
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    Top speed

    I have a 2004 R1150RTP a with 175k and I had her to 120 MPH in the Nevada desert this summer and still had 500 rpm to redline in 6th gear. 109 is low. Speedo could be off, what is your RPM?

  12. #12
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    I don't know how severe this popping is, but I would expect it- briefly as you come off full throttle. The initial excess of unburned gasoline has to go somewhere- watch a NASCAR short-track race. When they let off, there is a fire out the exhaust....Again the build up of unburned gas from a system that was full on flow.
    If it is continuos, I would think the gas flow is staying on- used to see this in carb days when the butterflies in the carb were staying open.
    Some engines you can actually make this happen on demand but going from full throttle to, let's say 1/8th throttle, leaving the engine and drive train engaged. The unburned gas has to go somewhere.
    OM
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  13. #13
    Left Coast Rider
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    I see you're from eastern Washington. What's your elevation?

  14. #14
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    Quote Originally Posted by BC1100S View Post
    I see you're from eastern Washington. What's your elevation?
    Elevation is about 1000 ft. Also the popping is any deceleration from any throttle position.

  15. #15
    MOA #24991 Pauls1150's Avatar
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    A few of the bikes I've had my grimy mitts on popped less after a careful "Zero=Zero" realignment of the TPS, so search this forum and the Internet BMW Riders for the procedure.
    Roger04, please chime in here, what's the "better" Zero value again?

    Air leaks may also be found in the short manifolds that connect the throttle bodies to the heads; and in the vacuum abortion that is the charcoal canister assembly (with switch + hoses) - recommend that be totally deleted with extreme prejudice, and the ports on the bottom of the throttle bodies be capped.
    Another possible source (usually on the higher-mileage bikes) is the throttle shaft bushing on the side; sometimes you can hear that rattle.

    Prior to readjusting your sync/etc. - Did you pull the two "Big Brass Screws" (the idle air adjustment) from the throttle bodies and clean off the tips? And then use a liberal amount of carb cleaner (or gas) and Q-Tips to clean out that passageway? And also clean out the bores of the throttle bodies, especially where the throttle plate meets the inner bore. Any buildup of old stuff in these places will affect idle and airflow, resulting in overall mis-adjustments as you attempt to sync.

    Have you verified that the bike has the correct Catalyst Coding Plug in there? I think yours should be pink; sometimes people pull these, or plug in other versions in an attempt to dink with the tuning.

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