cant get rs125 to start

dransy · World Chat Champion Joined: 04 May 2005 Karma :

So ive put my bike back together , new spark plug , checked for a spark and its sparking really well but it wont start the starter motor just turn and turns and it wont start up

any ideas?
cheers
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Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

Is it getting fuel (plug should be wet-looking after a bit of churning the engine)?

Did you take the engine apart? If so you might have made a boob of the timing.

finpos.

Whosthedaddy · Super Spammer Joined: 11 Dec 2005 Karma :

Fuel tap turned on?
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edd · Nearly there... Joined: 06 Jul 2005 Karma :

Blau Zedong · Banned Joined: 26 Jun 2006 Karma :

faith183uk · Nitrous Nuisance Joined: 15 Sep 2005 Karma :

First of all i'd remove the plug, put your thumb over the plug hole and press the start button. The pressure should blow your thumb off the hole. If so then compression is not your problem.

I would then pour a small amount of petrol directly into the cylinder via the spart plug hole, replace the plug and try again. If it starts and runs a while then its a fueling problem. Most likely carb.

Also make sure the breather hole on the tank is not blocked as this will stop fuel flowing. A quick check is if you open the petrol tank cap and it hisses then you have a blocked breather (the hiss is the air rushing into the empty space)

Check the fuel tap is on and clean, remove the pipe to see it fuel is flowing nicely

Also check the kill swith is set to run (not being funny but it happens)

What sort of noise is the starter making, does it sound like its enganging and turning the engine?