Question about Yamaha Motorcycles

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I have bought a 1981 Yamaha XJ550H Maxim The Idle was 4000Rpms, Since, I have replaced the Intakes, and Have rebuilt the carbs with new slide diaphragms and put new carb kits in the carbs, I have bought a Clymer and Yamaha XJ550H/RH manual, but there is no pilot screw settings in the books to set the carbs. the person I bought the bike from said he worked on the carbs and I found that the pilot screws were 1/4 turn out on 3 of the carbs and 1 and 1/2 on the fourth, where should I set them now that I've rebuilt the carbs ?

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  • Yamaha Master
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Hi, Anonymous start with 1 1/2 turns out then you will need a vacuum board or 4 vacuum gauges to sync all four.
For this scenario, you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $10 you can download another one.
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.
81 Maxim xj650 Carb Sync Running like Cap
Carburetor Sync Yamaha 650 Maxim 1981
DOWNLOAD YAMAHA XJ550 Maxim Seca REPAIR SERVICE MANUAL Download Manuals... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xj-owners-manuals

Posted on May 13, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: idle speed problems

Hi Walker14,

You have to sync thecarbs and also you will have to reset the air-fuel mixture screws.
One of the carburators should be factory adjusted, I dont wn a kawasaki but I own a YAMAHA SECA XJ750R and thro it I am sharing my experince.
Once you have located the factory preadjusted carburator you can thn set the others to its specs. I use the feeler gauge to do for my bikes carburators and it works fine.
With regards to the mixture screw..... get the all in tightened but slowly aas to not damage the pin end of it!.
Start the bike and get it to normal running temp and thn set the screws 2 and half turns out...you may need to set your idling speed before you begin this setting of the mixture screws, you prolly will hveto go higher on revs or vicecersa ....onc eyou are at the mixture screws and adjusting them , you will surely note the differenc ein sound of he bike an its idling ..
Hope this will help.


Knight.

Posted on Feb 02, 2009

  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

  • 53 Answers

SOURCE: rebuilt carbs-starts and idles but wont rev up without choke on

sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim

Posted on Mar 29, 2009

  • 9 Answers

SOURCE: IDLE ON A BAYOU 250

clean all jets in carb.idle jet is a long jet with 6 to 8 holes no the side & 1 on the bottom.

Posted on Apr 23, 2009

  • 200 Answers

SOURCE: Bought a 2000 yamaha yzf600r

You can fail emissions on a bike in arizona ? Wow i thought california was bad....anyhoo let's get to your concerns....All those srews should be very close to the same setting....rule of thumb is start at 1and1/2 turns out on each screw, almost any gasoline engine will run at these setting then you can fine tune from there.....no wonder you had bad idling problems...Good luck to you friend....Tim

Posted on May 12, 2009

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