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I have a 1990 suzuki katana 750 it wont start I have fuel spark but the compression 90 psi on one cyl and 50 on the other three whats up?

Posted by Scott on

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1 Answer

Gregg Mahin

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  • Motorcycles Master
  • 65,298 Answers

Hi, Scott and the usual suspects are:
1. Improper valve adjustment.
2. Broken or loose cam chain.
3. Loose or broken cam sprocket.
4. Bent, burnt or stuck valve.
5. Blown head gasket.
6. Piston failure.
7. Broken connecting rod.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
https://rislone.com/uncategorized/top-causes-of-low-engine-compression-and-how-to-fix-them/
https://www.youtube.com/watch?v=X_tbksFYhl4
https://www.manualslib.com/manual/813897/Suzuki-Gsx-R750.html
https://www.partsfish.com/page/oem-parts-for-suzuki
http://mybikemanuals.com/suzuki/

Posted on Aug 17, 2020

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5 Related Answers

Anonymous

  • 1392 Answers

SOURCE: need to know oil type and qty aand filter

Takes 10W40 motorcycle oil, and should be about 4-4.5 quarts.

Posted on Mar 07, 2009

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ginocussen

Gino Cussen

  • 217 Answers

SOURCE: compression test on a gsx1100 suzuki katana

156 to 213 pounds per square inch.

Posted on Mar 26, 2009

tombones

  • 3567 Answers

SOURCE: ''I am looking for 1983 suzuki GSX 750 S Katana Owners manual''

Google " service manuals suzuki "
or go to www.repairmanuals.com
or try your local library. Often guys will donate manuals to the library.

You might find a free pdf service manual on this site, they have a ton of them.
http://www.carlsalter.com/motorcycle-manuals.asp

Please rate this solution. Thanks!

Posted on Apr 05, 2009

Anonymous

  • 4 Answers

SOURCE: backfire during shifting between gears

could be few probs, carbon build up on piston crown try a good cleaner fuel additive, your exaust is leaking or blowing allowing air to be sucked back in on revdown as well as you could have a inlet fault overfueling leaving to much unburnt fuel to enter your exaust, might be simple fix by just replacing the air filter and checking for burn marks around the air intake.

Posted on Jul 10, 2009

wd4ity

wd4ity

  • 4565 Answers

SOURCE: suzuki gn125 wont start. checked carb, cdi, coil.

Check the valve adjustment. If a valve is standing open just a little, the compression will be too low to start the engine. Check fuel delivery by dribbling a little gasoline into the carb and try starting the bike. If it starts and runs for a second or two, you're not getting fuel into the cylinders. Check you carb again.

Posted on Oct 19, 2009

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Hi, Foxygirl309 you need "FIVE" things in order for a cylinder to run properly:
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5. IGNITION TIMING: on older bikes check to see if your points have not closed up, timing plate has not become loose and confirm with a timing light for proper retard and advance functions, on newer bikes where timing is controlled by an ECM and is nonadjustable check you CKP, TPS, MAP, O2, sensor or its counterpart for integrity.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
riding bike only on three cylinders
Running on 3 Cylinders Why
Suzuki GSX600F Service Manual
https://www.partsfish.com/page/oem-parts-for-suzuki
http://mybikemanuals.com/suzuki/suzuki-gsx-owners-manuals

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Please rate this answer. Thanks!

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