Motorcycles Logo

Related Topics:

Question about Honda Motorcycles

1 Answer

Why is my 1980 Honda CB 900 dying when it gets hot?

Changed coils, CDI boxes, cleaned all the grounds, changed the solenoid, still losing spark on 2 cylinders, everything has been scrutinized and changed and cleaned. What could be the problem?

Posted by Tracy M on

Ad

1 Answer

neil

  • 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.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 147 Answers

Hi

not sure if its a old SOHC with the 900 upgrade
or a very early DOHC 900
because 1980-1981 was a change over year when they did away with the SOHC 750 - 900
and brought out the DOHC 750 - 900

the main issue with the okd single overhead cam was the oil ways get blocked up and starve the cam of oil
eventually the came will eat its way into the head normally the the end of the cams
you might need to seek a new head or reconditioned one if you can find one
the DOHC has the same issue just not as much

good luck

Posted on Dec 03, 2022

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

0helpful
2answers

If the coils are not the problem what else could it be?

Three things you need to run that motor. Fuel , fire and air. Do you have spark to the plugs?! And do you have fuel pumping?!
1helpful
1answer

Why is my 97 Honda 4 wheeler not getting fire

There are three items that are connected together needed to create spark on your 1997 Honda 4-wheeler, regardless of which model it is.
Before we go through a checklist of these three important parts, look for a black wire with a white stripe that runs to the ignition switch and kill button from the CDI box. Disconnect this wire before it gets to the ignition switch and kill button, then check for spark. The most likely cause is a broken kill switch on the handlebar, or shorted ignition switch. Such a condition grounds this wire and kills the spark.
If this test did not restore the spark, continue reading...
Here is what is required to create a spark.

First, the alternator has one coil which generates a high voltage--about 125 Volts AC for the CDI ignitor box.

Second, there is a pulse voltage generated once every revolution of the engine that goes to the CDI box. This pulse causes the CDI to dump its stored energy from the 125 volt line into the primary of the ignition coil.

Third, If the two connections of the wire that runs from the CDI to the Coil are BOTH SHINY clean, the ignition coil will generate a spark.

If any one of these 3 don't happen, the spark will go away. Of these three, item 3 -- one or two tarnished and/or dirty connectors -- is the most likely cause. Just an added resistance of 0.3 Ohms or more in the CDI to Coil connections will cause the ignition to fail. No other wires have to be this clean.

Sep 26, 2014 • Motorcycles
0helpful
1answer

No spark on kawazaki kl250 a3 1980 model

Sounds like all there is left is the plug wire from the coil - but it's probably a single unit - coil and wire w/ plug boot.
All that comes to mind is grounding. With a VOM make sure you have a ground. Also look further up the chain - follow the wiring the CDI unit plugs into for breaks. Headlight gets brighter when kicked over ? Follow the wiring to it's termination points, loose plugs etc.

Single cylinder engines vibrate an awful lot, with that in mind look things over. There is a chance the no spark condition is a product of an unrelated failure - ignition system could be fine. Check the stator coil for an open circuit where it should be closed.

Besides checking wire and plug condition, cleaning and tightening grounds. The stator is the first place I'd check.
Be careful and gentle, the coil wires are very fine and as such break easy. A shorted winding will show continuity but not generate power, a web search should give resistance ranges of the coil assy.
Too low fail/Too high fail ranges.

My brain is picked out....Hope it helps you.
Sep 02, 2014 • Motorcycles
0helpful
1answer

99 bear tracker

ok did you check for a good engine ground
Jun 09, 2014 • ATVs
0helpful
1answer

Cdi box, I keep blowing them after installing i get about 5 minutes and then lose spark to 2 of the 3 coils on my 2005 Yamaha Vector. Help

I had the same problem with my 2006 Vector. Blown 4 CDI units. Changed out complete wiring harness and Stator, new plugs, Carbs. We narrowed it down to the coils. They were for an RX1 (based on the part number). swapped out with OEM vector coils. installed new CDI.. Sled is running flawless now.
Jan 03, 2014 • Motorcycles
0helpful
1answer

What colour wire goes were on Honda cb 900f ignition coil 1980 model

There are two ignition coils.1) With Black/White and Blue wires that goes to 1 & 4 cylinders2) With Black/White and Yellow wires that goes to 2& 3 cylinders
0helpful
1answer

1980 xs400 se will not get spark some wires burnt

possible the cdi unit went the journeyat the same time, only way to tell is to try another cdi. best of luck.
3helpful
2answers

1980-gl1100-honda goldwing-no spark at plugs-

using a meter check your engine to frame ground
your testlight is completing the missing ground wire connection; allowing the spark to jump to ground
Not finding what you are looking for?

52 views

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

7336 Answers

Marvin
Marvin

Level 3 Expert

85241 Answers

Mike

Level 3 Expert

4383 Answers

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

Answer questions

Manuals & User Guides

Loading...