Question about 2005 Suzuki Boulevard C90

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07 C90T bone stock, 14000 miles. When cold weather riding, low 30 degrees, bike runs fine on warm up mode about 3 miles into ride sufers servere power loss, knocking. crack the throttle it gets worse. Only runs good at low revs. After a few miles it comes back full power. Maybe warms up all the way. On two occasions it happened on highway. 97 degrees yesterday. I was getting ready to limp in on the breakdown lane. Dealer took it for test ride and of course could not replicate problem. I use brand name gas and synthetic oil. Wondering if I have a decompression valve and it is malfunctioning. Guys thanks for any help you can give me. Mike

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  • 40,627 Answers

Hi, Robert_dwigh and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
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. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Old dead or bad fuel.
11. Faulty fuel pressure regulator
12. Pinholes in the in tank plastic convoluted tubing from the pressure regulator to the quick disconnect check valve.
13. Fuel tank vent system plugged.
14. Throttle body controls misadjusted.
15. Damaged throttle body or intake seals.
16. Loose, dirty, or corroded ignition module connector at crankcase.
17. Faulty TPS, MAP, CKP, O2, and/or CMP sensors.
18. Incorrect valve timing.
19. Weak or broken valve springs.
20. Damaged intake or exhaust valve'
21. Control module may be in "LIMP" mode
22. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Posted on Apr 08, 2017

6 Suggested Answers

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Posted on Jan 02, 2017

  • 2336 Answers

SOURCE: Electrical Issue

Had the same problem. I had to remove battery, take apart the battery terminals, sand them a little, then put it all back together. Make sure the screw on the front of the terminal holding the inner bar in place if very tight. Have had no problem ever sense. Good luck.

Posted on Nov 10, 2008

  • 6 Answers

SOURCE: stalling out

u have the mixture screw wound in to far. its normally located on the bottom of the carb. try winding it out half a turn at a time once the bike has warmed up. also turn the idle screw out a quarter of a turn at the time its in to far thats why it idles at low revs. the choke is needed to keep the air fuel mixture right thats why u are having to leave it on for so long. hope this helps.

Posted on Jan 01, 2009

  • 375 Answers

SOURCE: I need tuning specs for my 1982 suzuki gs 750.

You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.

Posted on Jun 29, 2009

  • 47 Answers

SOURCE: 1988 Suzuki GSX-R750 Slingshot problems(fuel/air)

Sounds like ignition problems; I know you've had it serviced but check condition of spark plugs. Check all electrical contacts for corrosion, more specifically the timing pickup circuit, wires to coils, CDI connector. You're CDI may be the culprit, try swapping it out for a known good one. If it's back firing then enough fuel is getting through the carbs, so would indicate to me that the problem doesn't lie there. Hope you have some luck.

Posted on Mar 12, 2010

  • 91 Answers

SOURCE: Loss of power accelerating after the bikes warms up GSXR 600 K7

I believe the clutch disc is slipping. This is not something that will get better on it's own. Clutches are wearing parts. When they are worn out or dangerously out of adjustment the clutch will slip. That is to say it will not transmit as much of the available power to ground as it should. You must get this fixed as soon as possible. If you do not know how to adjust the clutch cable find someone who does and pray that you have not already glazed the clutch. Glazed clutches have to be reworked or replaced. Either way it is a big expensive job. Get it done. Ride easy or not at all until you get it fixed. Good Luck.

Posted on Mar 20, 2010

Testimonial: "This solution sounds about right to me. Just had the dealer collect the bnoike 30 minutes ago. He recond it was clutch too. We'll wait and see"

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