CG125 not starting/back firing

DMCpro · Traffic Copper Joined: 16 Jul 2012 Karma :

Driving home from college on Monday the old dog broke down. I was kick starting the bike and then the kick starter decided to snap and fall off.

I tried bumping it and after a good 5 minutes running up and down the road got it going after around 5 minutes it started back firing then it cut out completely whilst going along in gear the engine was turning but felt like no spark . I tried bumping it again and it wouldn't go so I left it chained up in carshalton.

Yesterday I picked it up in the van and brought it home seems like I'm getting a intermittent spark so I'm thinking this is why it isn't going.

Ive put a new kick start on it.

It's a points ignition engine unsure of the year as it's not the original engine.

So what do we think has gone wrong. I'm guessing the coil has broken down as it was running then not occasional bsck firing / poping

TL;DR: bike won't start dunno why
____________________
Honda CB-1, TS125X
VW Golf Estate

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

so you are capable of fitting a k/start mech....good.........and everything on the engine seems good, apart from intermitant spark at the plug??

long shot even on a cb pints ign bike, but has the flywheel key sheared..........check position of flywheel when piston at tdc on firing stroke, do the timing lines align??

you have the tools to remove the flywheel i presume so could do it that way, and check all stuff under the flywheel. prior to doing this, are the points opening??
____________________
nuts about bikes

DMCpro · Traffic Copper Joined: 16 Jul 2012 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Your points... have you checked they are set correctly.

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

flywheel mag on this bike?????

quick test to see if points open when they are supposed to......

or are they opening at the wrong time due to sheared flywheel key.........

odd ball i know but wait till you come across a honda stationery engine, which checks out all ok, good spark even, but the little gem still refuses to start, as the f/wheel key has sheared.

make a mental note of that one cos at some time in your carrerr your gunna come across it. :D 8o) :karma: :wink:
____________________
nuts about bikes

DMCpro · Traffic Copper Joined: 16 Jul 2012 Karma :

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

i hope you have the time to check oil level and fuel?? if not then make time.........cos a stitch in time saves nine.....if you know what i mean....karma.
____________________
nuts about bikes

DMCpro · Traffic Copper Joined: 16 Jul 2012 Karma :

stickybackbob · Trackday Trickster Joined: 23 Mar 2013 Karma :

As most have said, check that the points are opening at the right time. When were they last looked at? Could be time to replace along with the condenser.

DMCpro · Traffic Copper Joined: 16 Jul 2012 Karma :

Quick update I checked the points they were clean as a whistle so I took my coil into college and tested it there and it showed a very weak spark so I have ordered a new one should be here some timr this week
____________________
Honda CB-1, TS125X
VW Golf Estate