Question about 1972 Honda CB 250

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Bike wont start

Had it going a year ago, wont start at all now. does not do anything when I try, seems to have a weak spark.

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  • caseysama150 Apr 29, 2010

    It is not the battery, it is brand new.

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Spray some fuel or brake cleaner or quick start into the intake. if it starts then the carb is gummed up and will need to be removed and cleaned out.

Posted on Apr 29, 2010

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The battery has to be very weak as of now. Check the voltage of the battery.l It must be showing 13.5 volts to start thius bike. Under a load test it must show a hold of 11 volts or better to keep the battery or else its junk satatus

Posted on Apr 29, 2010

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2 Answers

Weak fire on pocket bike


Hi, I do a lot with these bikes, I think if you are getting a weak spark there is a couple things to check. First, do you understand how it builds the power to create the spark? The magnet in the flywheel has to be very close to the magnito or coil, if the gap is too much it will cause a weak spark, if the magnet is weak, weak spark, if the coil is shorting internally, weak spark. If the plug wire is damaged, weak spark. I hope this helps you.

Jan 25, 2015 | Quad 47 cc / 49 cc Pocket Mini Bike...

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Hello, only just got the TRX850 a month ago and I'm finding it very difficult to start compared to my faithful VFR750f (now departed). It starts, though it will only if i hold the starter button with choke...


new bike take it back for a warranty check
old bike , do a compression check , check fuel pressure
forget the plugs as they work when it is running
have a load test done on the battery as a failing battery while cranking will not have enough power left to run the ignition system hence the weak spark

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I have a 2005 triumph speed triple, a few weeks ago it was haing trouble starting so I replaced it with ngx iridium spark plugs it started right up after I charged the battery. A week later it was...


Check the inline fuse that is normally close to the battery. Also try again with the battery connected to the charger. Most batteries only have a life of around 5 to 6 years, often less on a bike due to vibration.

Aug 02, 2017 | 2005 Triumph Speed triple

1 Answer

The bike is starting only with small plug gap.If we set the gap to original it wont start? tell me the reason?


.....A weak battery comes to mind for starters. A carboned up spark plug is another; start with a new spark plug. If I recall correctly from 39 years ago, your bike has ignition points and condenser. Remove the points cover (on left end of the overhead cam), and check the points. Burned? Pitted? Get a new set of points and condenser but for now, just file the points a bit using an emery board or metal fingernail file. Set the points to .015 clearance at the high point on the cam lobe. If you have a timing light you could check the timing and adjust as needed by rotating the points base plate left or right. Bad points give resistance to the flow of electricity. When the points are closed, the condenser gets charged up. Less electricity going through the points means less of a charge going into the condenser. Now the points open up and the stored charge goes from condenser to coil. The coil then produces a spark. With a low charge in the condenser, the spark is weak and will not jump a wide gap. Set the plug gap to very little and the weak spark can jump the gap. The standard gap is .028. ....... I don't recall when Honda move the points to the flywheel but the images below may help if your bike is that style. Clean any rust on noted parts; magnets and pick up coils. Okay, now I have done my part. Now you gotta do yours; please rate my answer. Thanks! tombones49_177.giftombones49_178.gif

Jun 15, 2011 | 1972 Honda CB 100

1 Answer

I have a 2005 yamaha venture royal star and i just replaced the iginition coil on the rear left hand side due to weak spark. The new coil seemed to have a lot more spark (maybe too much). The bike started...


If it wont do anything then it is likely that youve popped a fuse
But it sounds like the battery isnt being charged properly. Make sure the voltage across the batt terminals is at least 13.5v at tickover rising to no more than 15.5v at higher revs
Ride-Safe
Bike-Doc

Please mark this as helpful (if it has been!!)

Aug 14, 2009 | 2005 Yamaha Royal Star Venture

1 Answer

Basicaly brand new cr25o mx bike wont start


Assuming you are using fresh gas. Check to see if gas is coming out of the line, if not blow back up into the tank and if that works there's dirt in the tank. Check the spark by removing the plug and kicking it over with the plug touching the engine, look for spark. If no spark, try a new plug, if still no spark, you have a stator problem. It wouldn't hurt to clean the air filter in any case. Good luck!

Jun 12, 2009 | 2005 Honda CR 125 R

2 Answers

Wont start


I had the same bike for 3 years and it wouldn't start when it was too cold outside under--about 33-37 degreese--it wont start.
---how cold is it where your trying to start it--

i know this bike like the back of my hand

you can email me @ workhorsemo@aol.com

Apr 24, 2009 | 2002 Yamaha TT-R 125

3 Answers

No spark wont start


Hey i had a similar problem a liitle while ago on my yamaha,i disconnected the kill switch wire then i had spark(faulty kill switch)
Woth a try,cheers, Alan.

Jan 12, 2009 | kawasaki Full Suspension Mountain Bike Men

1 Answer

Wont start


FIRST thing to check is spark plug ,make sure it is sparking ,if it is and is wet change the plug .If plug is dry it could be the carb needs cleaning out if it has beesn stood for a while

Nov 15, 2008 | 2004 Yamaha DT 125 R

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