Help with my Suzuki 125 please!

sichoice · L Plate Warrior Joined: 02 Jun 2015 Karma :

Hello

I have a '93 Suzuki GN 125 and it has been a good runner for me, but it doesn't like the mornings! It won't start, but makes the necessary noise so the battery isn't flat and when I try later in the day it turns over first time. Can anyone please help?

Snod Blatter · Crazy Courier Joined: 21 Nov 2014 Karma :

Have you tried operating the choke? Thinking

____________________
1994 CB250, 1984 CBX250RS-E, 1989 K100RS, 1995 TRX850, 2016 Z250SL

sichoice · L Plate Warrior Joined: 02 Jun 2015 Karma :

Yes. I should have said. The bike just doesn't catch with or without using the choke. It hasn't even been particulary cold in the mornings either.

Ziggy81scott · Borekit Bruiser Joined: 27 Feb 2015 Karma :

Not a very practical suggestion I know but you could try taking the spark plug out and warming it with a lighter or match.

sichoice · L Plate Warrior Joined: 02 Jun 2015 Karma :

I am happy to try anything Ziggy81scott.

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

when was the last time you did the valve clearances?
i have a little dr125 (same motor) and it starts on the button but was quite difficult to start when the clearances were too tight,
its a 15min job to do, and pretty easy
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

piggoy · Two Stroke Sniffer Joined: 14 Jan 2015 Karma :

Does this engine have old fashioned points/condenser or modern electronic CDI? If you have the former it may be worth checking them - you may not be getting a reliable spark on the cold mornings.

sichoice · L Plate Warrior Joined: 02 Jun 2015 Karma :

Any chance you can please teach me how to hmmmnz? I am not afraid to admit that my knowledge of motorbike maintenance is very limited.

sichoice · L Plate Warrior Joined: 02 Jun 2015 Karma :

It is the old version piggoy.

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

first you need a set of feeler guages. screwfix or toolstation have them for around £5
you'll also need a spark plug spanner.
some ring spanners.

and download the manual from here

to do the job.
1, remove spark plug and put bike on center stand (if fitted)
2. remove the 2 round plugs at the top of the engine, (you'll see the rocker arms and tappets inside)
3. pop it in 3rd or 4th gear and rotate the rear wheel. you'll see the rocker arm push down on the valve via the tappet. keep roatating the wheel until the valve goes down and back up again, and a wee bit more. there shouldnt be any weight from the cam to the rocker arm now,
4 loosen the lock nut on the tappet, and loosen the tappet off a wee bit,
5. with the feeler guage choose one (0.1mm for the intake (carrb side of engine) or (0.13 for the exhaust side of the engine) it might need 2 feeler guages to make up the number.
6 slide the selected feeler thickness between the tappet and the top of the valve.
7. wind in the tappet until its tight on the feeler guage, but not so tight it can't move. the guage should be able to move but be rubbing on the valve and tappet,
8 with the set, hold the tappet with a flat bladed screwdriver so it doesnt move when you tighten up the lock nut.
9 nip up the lock nut and check that the feeler can move but isnt too loose.

repeat from step 3. on the other valve.
job done.
put the caps back on and plug back in, and put it back in neutral.

you can also use the timing marks on the fly wheel to get it to get to the correct place, but i dont bother, up to you.

https://www.youtube.com/watch?v=2006Q8dMNdw is a video on the gs which also has the same motor as yours.

have fun
____________________
the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

sichoice · L Plate Warrior Joined: 02 Jun 2015 Karma :

Thanks Hmmmnz. I will let you know how I get on.