couple of questions - Motorcycle-Journal Forums

white8785 · 12-23-2004, 05:14 AM

1. will '94 rm125 rims fit a '00 rm125?

2. just bought a '00 rm125 that had been sitting for a few months inside a shop. had some trouble starting it, but it started and ran fine. since that day i haven't been able to kick start it unless the bike had been running and had a chance to warm up. it will start if i push start it a few times, but that's the only way i'm able to get the bike started after it has cooled down. also, i took it out the other day and rode for a while, but when something would happen and it would kill it it wouldn't kick start then either, only push start.

can anyone think of some things that would cause this? i was going to pull the carb out and clean it, but i wanted to see if there was something else i could be looking over. i have a blue spark when i remove the spark plug, and i've already replaced the spark plug once. to me, it fouls the plug fairly easy so i'm not sure what it is.

thanks in advance.

americanpower454 · 12-25-2004, 08:05 PM

i had the same problem i first started with cleaning out the carb but that didnt work so i used my dads compression tester and it ended up that it didn't have enough compression due to 2 scores over the exhaust ports and a gouge in the piston and ring. the first thing i would do is check the compression it should be somewhere between 110- 130 psi to kickstart good luck

92 RM 125 · 12-26-2004, 08:55 PM

sounds like something in the carb. and the reason for fouling plugs is definatly a jetting problem.

robeych · 01-13-2005, 11:37 PM

Any number of things could make it hard to start. A couple things to check would be the condition of the reed petals, the carb settings (float level, pilot jet size, etc), compression of the top end, electrical connections (all the wire connectors and ground points- this includes the spark plug cap and wire going to the coil), and check for any air leaks.

Some bikes (CR 500's for instance) are a bit reluctant to start without having anything major wrong. Tipping the bike over until fuel runs out of the carb overflow hoses raises the float level temporarily and can make starting much easier.

Knoc · 01-14-2005, 08:14 PM

1st thing like 454 said would be to take a compression test. Thatd be my guess is that you need a ring job. Check that and then if not Id go for the carb work. Good luck

12-23-2004, 05:14 AM	#1 (permalink)
white8785 Newbie Joined: Sep 2003 Location: Lou, KY Posts: 4	couple of questions 1. will '94 rm125 rims fit a '00 rm125? 2. just bought a '00 rm125 that had been sitting for a few months inside a shop. had some trouble starting it, but it started and ran fine. since that day i haven't been able to kick start it unless the bike had been running and had a chance to warm up. it will start if i push start it a few times, but that's the only way i'm able to get the bike started after it has cooled down. also, i took it out the other day and rode for a while, but when something would happen and it would kill it it wouldn't kick start then either, only push start. can anyone think of some things that would cause this? i was going to pull the carb out and clean it, but i wanted to see if there was something else i could be looking over. i have a blue spark when i remove the spark plug, and i've already replaced the spark plug once. to me, it fouls the plug fairly easy so i'm not sure what it is. thanks in advance. __________________ JR '99 TLR '00 RM125

01-14-2005, 08:14 PM	#5 (permalink)
Knoc Ditch Magnet Joined: Oct 2004 Bike: 2000 Bombadier Ds650, 1989 Suzuki Rm125 Location: Central Minnesota Posts: 185	1st thing like 454 said would be to take a compression test. Thatd be my guess is that you need a ring job. Check that and then if not Id go for the carb work. Good luck __________________ www.AndysGraphix.com For all your Vinyl graphic needs

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12-25-2004, 08:05 PM	#2 (permalink)
americanpower454 Newbie Joined: Nov 2004 Posts: 13	i had the same problem i first started with cleaning out the carb but that didnt work so i used my dads compression tester and it ended up that it didn't have enough compression due to 2 scores over the exhaust ports and a gouge in the piston and ring. the first thing i would do is check the compression it should be somewhere between 110- 130 psi to kickstart good luck

12-26-2004, 08:55 PM	#3 (permalink)
92 RM 125 Seat Tester Joined: Sep 2004 Location: Burrillville RI Posts: 79	sounds like something in the carb. and the reason for fouling plugs is definatly a jetting problem.

01-13-2005, 11:37 PM	#4 (permalink)
robeych Newbie Joined: Dec 2004 Posts: 12	Any number of things could make it hard to start. A couple things to check would be the condition of the reed petals, the carb settings (float level, pilot jet size, etc), compression of the top end, electrical connections (all the wire connectors and ground points- this includes the spark plug cap and wire going to the coil), and check for any air leaks. Some bikes (CR 500's for instance) are a bit reluctant to start without having anything major wrong. Tipping the bike over until fuel runs out of the carb overflow hoses raises the float level temporarily and can make starting much easier.

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