Question about 1972 Honda CB 350 F0

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I have a 72cl350 No spark from right plug or very weak spark what should I replace

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Clean or replace your points first. You may need to disassemble and clean the points to make sure they are not shorting out to the frame. sometimes you have to install new points several times before they don't short. Be patient , working with Honda points can be tedious. Also consider new spark plug caps (about $5 each).

Posted on Aug 24, 2010

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I have a problem i just picked up a 1972 cb 350 twin cyl. the ignition switch is gone also the rectifire is missing will i be able to start this bike with out these parts i don't want to spend the money if it won't start what do i have to do

Posted on Mar 27, 2011


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Try replacing the spark plug and the spark plug cap. If the resister in the spark plug cap burns out it will cause a weak or no spark. Most plug caps simply unscrew counterclockwise off of the end of the plug wire. An NGK replacement plug cap will cost between $5 - $10. With the cap off the wire you can check the resistance with a volt meter. Most caps should read 5000 OHMs , any reading higher or lower means it is time to replace the bad cap.

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Weak spark,willnot start,changed plug

A weak spark can be attributed to a number of issue:
1. Wire from the magnetto to the spark plug is saturated with oil (clean well with degreaser)
2. Spark plug cap deteriorated. (most are not easily replaceable)
3. Spark plug fouled (insure you are using new)
4. Significant build up of rust on the flywheel (lightly sand rust off)
5. Bad Magnetto or CDI (especially if it has gotten wet or is cracked.) Note: (Cost typically prohibitive for replacement).
6. Spark plug gap significantly out of specs. (Regap to specs, retry)

If you are certain you have a weak spark, these are typical causes. Often, more likely problem is carburation, fuel filter and/or fuel lines - which are much easier and less expensive fixes! Hope for the fuel lines being cracked...Good luck :)

Sep 25, 2010 | Garden

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No power when driving, runs rough, spark plug are new but look black when removed which indicates running too rich. The computer fault code says 14 which is the ignition signal circuit but I don't know...

Replace your entire distributor assembly. Your primary or secondary coil is compromised. Running rich because of weak spark. If you do a spark test, you will not see a bright blue spark if I am right. You will instead see a weak, almost orange spark.

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My leaf blower won't start. I've checked, fuel, cleaned filters, and carbon build up. I realised spark plug isn't firing, so I replaced it but it's still not firing.

did you make sure the new spark plug was igniting if it is or if its weak you might have broke the flywheel key was it running fine when last used there can be alot of things it could be 2 cycle engines must have 120psi of compression ,the right fuel mixture,good plug right gap between flywheel & magnito (spark plug wire connect to to get spark) and not rust on flywheel & magnito hope this helps let me know thanks

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My distributor has a strong spark but there is hardly a spark or weak spark going to my spark plugs and i just replaced my dstributor rotor button and crank sensor

Try replacing the spark plugs and wires. You may be have high resistance within the wires causing a weak spark on the other end. Also try regapping the plugs. If the gap is too large the spark will need to be more powerful to jump the gap. If its too large you wil also get reduced performance and fuel economy and possibly rough idling...

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1986 gas club car weak spark replaced coil still same

How do you know that the spark is weak?
Replace spark plug.
Check spark plug wire for leaks.
Replace fuel.
Clean points and reset.
If there is a battery check that it is at 12.5 during starting.

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1 Answer

Will not start or fire new plug fitted

First, check starter assembly whether it's catching properly.
No spark usually means problem is around the spark plug -> spark plug boot -> lead wire -> ignition module + flywheel. Make sure you have the proper gauge and tester to check this. Like a ZAT4 spark tester, for example.
1.) Weak or no spark: Check whether you have the right spark plug and whether the gap is right. Requires a gauge.
2.) Weak or no spark: Check the gap between the ignition module and the flywheel whether it is according to manufacturer specs . Requires a gauge.
Note: If you trace the lead wire from the spark plug boot, the other end is the ignition module - it sits close on top of a flywheel. Color is black with two "legs" extending at the bottom with the ends cut to an arc/semi-circle to accomodate the side of the flywheel. The flywheel is that round thick aluminum disk with ridges that resemble fan/fins.
3.) No spark: Check the lead wire and the spark plug boot. They might be corroded or have lost their functional integrity over time. They are inexpensive and are easy to replace.
4.) No spark: Time to replace the ignition module. They can be costly. Upwards of $45USD. Plus you really might need a technician to properly seat and gap it.

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2 Answers

My 98 Suzuki VL1500 has a weak spark to the rear cylinder. i've replaced plug, plug wire, coil, inition module, and stator. I've switched coils and plug wire from one cylinder to the other. The weak spark...

it is probably not a weak spark. if you are determing this because the plug is sooting up and fouling and or the bike is missing or just not running right. your carbs need rebuilt. know of same problem with friends bike. tried eveything. coils igniter etc.. check out g man give them a call they will explain what is going on with your bike

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