CR125 won't kick start but will push start?

[mad_max]

my Honda CR125 wont start by kick start. Whether its hot or cold but after a bit of a push it will start and run mint. Then when i stop it again, the same thing. wont kickstart and have to push again. This is not that good on a trail ride obviously so I need to fix it. Checked compression, thats not great but not the problem. New spark plug. checked reeds, theyre like new, cant be them.

Any ideas?

[Katman]

One of the first signs of low compression is difficulty starting with the kick starter.

Try fitting a new set of rings at least.

[unstuck]

One of the first signs of low compression is difficulty starting with the kick starter.

Try fitting a new set of rings at least.

What he said.

[barty5]

ill third that you said comp was good so what was it ?

[CRF119]

Yea what is the compression, I could be wrong here but should be about 180psi??

What plug are you running?

[mad_max]

I measured about 90-100psi but have recently been told i had to have the throttle wide open which i wasnt aware of so will try borrow a tester and test again soon. I am unsure how much difference it will make but it does make a lower reading than with throttle open. I am running a BR9ES (i think) just the same plug as the bike had when I got it and what I could find was right online.

[barty5]

I measured about 90-100psi but have recently been told i had to have the throttle wide open which i wasnt aware of so will try borrow a tester and test again soon. I am unsure how much difference it will make but it does make a lower reading than with throttle open. I am running a BR9ES (i think) just the same plug as the bike had when I got it and what I could find was right online.

anything much less than round 120 and youll be having probs the cr250s we just built both had round 190psi

[CRF119]

Depending how many times you kicked it will depend on the increase in PSI from closed to open. I think you will be lucky to see a 10-20spi gain so i guess its time to order a top end kit for it. I will test my mates CR125 tomorrow and let you no what it is but pretty sure urs needs a rebuild.

Just hope its not crank seals

[CHOPPA]

If its that low on comp it is way overdue for a top end! A couple of hundy and an hour out of your day would save a lot of hassle

[morg_nz]

br8eg is the plug you want - it is hotter than the br9 and the eg is the race version of the plug compared to the es - you will really appreciate it

[mad_max]

Oh yea, so might the B8eg at least make it run? maybe a contributing factor why it wont fire easily maybe? I had a 89 YZ125 way back and I could kick it over with my hand, it ran like shit but still ran and started. I am going to rebuild it, I just wanting to know why it wont run because im sure it would suddenly not start, I thought it would just take longer to start. It doesn't feel like it has that little compression for it not to start.

I was only riding for about 2 or 3 hours on a new plug when it stopped so maybe it killed the plug because it was the wrong plug

Cheers

[cheese]

Na you've just got shit compression. New piston and rings and it will going mental again.

[CRF119]

Yea a 8 series plug will sort any fouling problems you might have especialy when you are learning but id recomend replacing that with a nine series cooler plug if you start to really abuse it.

2 Stroke plugs just die no warning other then a slight bog then its over.

[mad_max]

So a 9 plug when I rebuild it you reckon? (just wanting to order a few good ones) Because as soon as it gets run in it will be getting abused Ive got a mate that runs a 8 in his CR250 and I ran one in my old YZ125, ktm 200exc and rm125. The only 9 Ive ever really come across was in a tf125

[scott411]

So a 9 plug when I rebuild it you reckon? (just wanting to order a few good ones) Because as soon as it gets run in it will be getting abused Ive got a mate that runs a 8 in his CR250 and I ran one in my old YZ125, ktm 200exc and rm125. The only 9 Ive ever really come across was in a tf125

nearly every 125 runs a 9 heat range plug, as well as KDX200's,

Most 250 2t's run 8's, which is one hotter heat range,

some of the 85's come with 10.5's, as well