Question about 1999 BMW R 850 RT

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At a constant speed engine doesn't run smooth the rpm goes up and down not to much but enough to make a shock effect ( im from belgium so my english is not that good)

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  • BMW Master
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Hi, Allinph1 and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in the fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor or intake seals.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, O2, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust valve.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
Surging or Hunting
http://www.ibmwr.org/r-tech/oilheads/t-screw.shtml
1993 2000 BMW R850GS R850R Service Manual Moto Data Projec BMW Motorcycle Parts Fiche OEM BMW Motorcycle Parts online 1970 present BMW
http://www.bmw-motorrad.com/us/en/index.html?content=http://www.bmw-motorrad.com/us/en/services/manuals/manuals_main.html¬rack=1

Posted on Jan 05, 2016

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Posted on Jan 02, 2017

brian_carr60
  • 63 Answers

SOURCE: 2003 BMW K1200LTE idles fine but surges mid range

Check throttle and choke controls are not sticky and air filter. If this is the injected engine the high pressure system seems at fault, you could try an injector cleaner additive that removes gum. consistent warm running suggests not a major problem

Posted on Sep 14, 2009

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