Question about Motorcycles

1 Answer

Hello, I am having a problem with my 1991 zx7. Randomly as I'm riding down the road say about 6000 rpms the bike will start sputtering and backfiring and the tach will flick sometimes down and sometimes up and sometimes to zero but it keeps running just not any power. It feels like it is only running on 2 or 3 cylinders. Have torn all into electrical and rebuilt carbs but can't figure it out. Any help would be greatly appreciated. Thanks...Donald...zwitteron@yahoo.com

Posted by on

Ad

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    New Friend:

    An expert that has 1 follower.

  • Expert
  • 163 Answers

Hi if you have checked HT leads plugs my next step would be to change fuel and air filters. I had a similar problem with a bike a little while ago a torned out to be the fuel filter. Hope you get it sorted

Posted on Jun 02, 2017

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
New users get 2 Free calls (no credit card required) and instant help on almost anything you can think of (from cars to computers, appliances, handyman, and even pets).
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
  • 2712 Answers

SOURCE: bike trouble

Yes! You will open those things up, and they will probably look pretty clean, but the problem with your carbs is in the Idle circuit - too small for you to see into. If you do a search of carb cleaning or related topics, you'll see that alot of folks with cab problems try to clean their carbs ... only to have to open them up again due to improper cleaning (They are difficult to clean properly, require alot of patience) So, I would suggest that you have them cleaned professionally, or at least buy good carb dip to get them really clean. Spray cans of carb cleaner are worthless. Might as well wash em with dish soap.

Posted on Nov 20, 2008

SOURCE: My FZR 600 is acting up and backfires

I have had several bikes in my time. and keeping the carbs syncranized is very important. Did you put aftermarket pipes on it? try rejeting the carbs up 2+mm that may help the fuel air ratio?

Posted on Feb 01, 2009

  • 202 Answers

SOURCE: Bike is backfiring through carb.

do u have the correct spark plug the one recommended by the manufacturer

Posted on Aug 02, 2009

MNfisherman
  • 11896 Answers

SOURCE: engine/electrical problem

charging device or voltage regulator is faulty.

Posted on Sep 13, 2009

mb50sa
  • 80 Answers

SOURCE: I recently purchased this bike.

Good choice of bike, I have the same!
Is it an early bike with points? If so this could be the problem (I can give you advice on setting them up if needed).
Check the simple things first. Take your plugs out and check their condition and colour. You want to see a biscuit brown colour. Are any wet or sooty? Are they the correct NGKB8ES plugs? Also check the plug caps. Take them off (they unscrew) and check for corrosion. Repace with new ones if they look bad.
Charging issues can also cause problems, so check that the system is healthy. Put a meter accross the battery, with the bike running, slowley increase the revs and check for a voltage increase to around 14volts dc.
These bikes have a bullet proff engine, its often electrical issues that let it down.

Posted on Aug 02, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

2001 road king Flhri check engine light comes on when I start bike. Checked all fluid levels ok. Has full tank of gas. Trying to get code by putting wire on 1-2 terminal in data link but nothing happens...


That's a toughee. I wonder if you have several issues happening all at once, OR the computer is having a nervous break down. I hate having other mechanics work on my bike, it's like letting someone else go through your wife's underwear drawer; but on this one a harley dealership has the right equipment and training. Sorry I can't be of more help

Jan 25, 2015 | Tank Motorcycles

1 Answer

Kawasaki ninja zx7 wiring diagram


When you say it keeps doing the same thing do you mean the wires keep burning, sounds as though you need to be finding a new wiring loom am sorry, if you carry on riding the bike you will eventually cook all of your expensive charging/and ignition components rendering the bike as scrap

May 20, 2013 | Motorcycles

1 Answer

Zx7 running weird tach flicking up and down


Sounds like an engine misfire, most likely due to a spark plug connector insulator leaking to the cylinder head.

Jun 27, 2017 | 1991 kawasaki ZXR 750

1 Answer

I have a zzr 600 94 kawasaki bike ws just kept fr around 8months just used to start it every week, but no riding it I have gt the bike out it has the old fuel in it an I tried riding the bike it's all...


sounds like carbs need a service, are sliders free and moving correctly, is there any restriction to fuel flow, fuel tap, is air filter good. any air leaks around carbs

Mar 15, 2013 | Motorcycles

1 Answer

99 dodge ram 1500 sputters and quits


i would check three parts , i have seen a weak ignition coil make this happen, change fuel filter and last possibly either fuel pump or fuel pump regulator

Jan 12, 2013 | Cars & Trucks

1 Answer

1999 oldsmobile alero sputters rpms going up and down


Hello.

The following are the general instructions on the start of diagnosing any electronically controlled engine or transmission problem.

The engine and the automatic transmission (transmission control is only for automatics, engine is still computer controlled no matter the transmission type) in this vehicle are computer controlled and in most cases when a fault occurs a fault code is stored in the memory of the computer control module. There are exception to this, such as the Mass Airflow Meter and fuel pressure problems. What must be done is to have all the basic testing done such as a scan of the system for fault codes as well as a check with a live data scanner tool for engine functions that are not within range of normal, a trained technician is required to know what is correct and what isn't, then based on careful diagnostics done from a factory repair manual the correct part is replaced or the wiring repaired or the computer replaced (known as the PCM), which is very rarely the problem. Other basic checks must be done as well such as mechanical problems with the engine as well as engine state of tune and mileage on the engine. The transmission can have mechanical issues as well such as no gear engagement at all or a failed pump or other pressure related problems. Also engine mechanical problems ca cause many drive-ability related problem such as rough idle and other symptoms


Oct 11, 2012 | 1999 Oldsmobile Alero

1 Answer

High idle on HD, 08 Road King Classic


For fast RPM's at start that doesn't go down shortly after starting.
1) Put bike in neutral
2) Push to ON the first switch to right of starter switch next to throttle.
3) turn dial on gas tank to the On position for 5 seconds then off wait 2-3 seconds and repeat 3 more times total of 4 times
4)then Turn everything to off positions
5) wait a few seconds and start normally

I found that if you shut down the bike with rpms up a bit, it will start the next time with a faster than normal idle.

If you do this technique when the bike is cold, it will run a little fast til it warms up. Don't ask me why this works.

Jun 05, 2012 | 2008 Harley Davidson FLHRC Road King...

1 Answer

I have a 883 harley davidson sporster, was riding the bike and road over a bump and bike shut down and won't start


I'd check the battery first. I've seen the post break loose from the batteries in many Sportsters and leave them dead on the road. I've only seen this happen once on a Big Twin. Why? I have no idea. If nothing on the bike works, this may be the problem. If everything else works but it just won't start, I need more information. Does the starter engage and the engine turn over?

Steve

Aug 13, 2011 | 2000 Harley Davidson XL Sportster 883

1 Answer

Bike trouble


Yes! You will open those things up, and they will probably look pretty clean, but the problem with your carbs is in the Idle circuit - too small for you to see into. If you do a search of carb cleaning or related topics, you'll see that alot of folks with cab problems try to clean their carbs ... only to have to open them up again due to improper cleaning (They are difficult to clean properly, require alot of patience) So, I would suggest that you have them cleaned professionally, or at least buy good carb dip to get them really clean. Spray cans of carb cleaner are worthless. Might as well wash em with dish soap.

Nov 20, 2008 | 1997 BMW R 80 R

Not finding what you are looking for?
Motorcycles Logo

Related Topics:

27 people viewed this question

Ask a Question

Usually answered in minutes!

Top Motorcycles Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4535 Answers

yadayada
yadayada

Level 3 Expert

76630 Answers

kakima

Level 3 Expert

102366 Answers

Are you a Motorcycle Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...