Suzuki 76 gt 125, help!

[T-Thunder13]

should i be putting oil in with my fuel? ive only had four strokes so i dont know alot about 2 strokes.i plan on doing ths bike up. its in good order but could do with a tune. it runs. just. any advice much appreciated.

[Ivan]

If it standered it should have an oil tank under seat

Pm Ajturbo he has my old one

[Ixion]

76 GT125 *should* have an oil pump. But sometimes people take them off. Bad idea. You should have a little tank on the sie of the bike (right side usually). Should be a couple of tiny hoses come from it (maybe just 1). Follow it, see that it goes to a thingy on the motor.

And that the tank has oil in it. The oil will get used.

Buy it a new spark plug, and decoke the exhaust. That's a good start for a two smoker. Then get it going and rape it mercilessly for 20 km. Then see what you've got. Should be a real nice little screaming demon

[T.W.R]

lols Had one as my 1st road bike

As ivan said there's a oil reservoir under the seat (roughly a 1lt capacity).
Also there's a circular sight glass for it in the L/H side panel

good old Suzuki CCI lubrication, line up the marks (synchronise) on the oil pump ( R/H side of the motor) with a Dot on the slide of the R/H carb ( there's an inspection hole on the carb body with a screw cover.

Have the original Owners handbook somewhere so will dig it out & find the specs

[T.W.R]

2stroke Oil reservoir capacity : 1.2lt
Spark plug : NGK B8HS or ND W24FS (gap: 0.6 - 0.7mm)
Engine oil : 900cc

Carb pilot air screw: 1.5 turns out from soft bed

Idle speed : 1300 rpm


Synchronise dot on slide body (R/H side carb) at top of inspection hole with pump actuation cam marks (line on cam & housing).Pump housing (R/H side top rear of engine behind chrome cover by kickstart lever).

[T-Thunder13]

Buy it a new spark plug, and decoke the exhaust. That's a good start for a two smoker.

great! what does decoke mean?

[Warr]

in the old days people used to fill the exhaust with coca cola so that the bike would have a more burpy exhaust note.

small PT there
A de-coke can be done several ways. What you are aiming for is to clear the exhaust of a layer/coating of gunk. Oily carbon deposits mostly due to short trips/ slow running.
To remove this gunk which is simmilar to clogged arteries
Method 1, Can use a solution of caustic soda. Dangers are your eyes,hands, clothing and anything it comes in contact with. Must use eye protection and rubber gloves and dispose of in a safe manner. ( no idea what that is !!)
But remove pipe including header and pour the stuff into the exhaust. Sealing one end will mean you can leave it sitting for a bit and swish it around.

Method 2, Find someone with a gas tourch, remove exhaust and burn it out. Much easier but it will catch fire and it will turn any shinny bits black, blue, whatever colour the heat gets to.

Good luck whatever you try!!

[Ixion]

The GT125 will have a chrome exhasut so the caustic method is the only way for a decoke. But it probably has removeable baffles so unless it is really bad just removing the baffles and giving them a goo wire brush an having a poke around the can with a stiff wire will be a good start.

Because two strokes burn their oil, their exhausts tend to become blocked up with burnt carbon. Remove the header pipe from the cylinder and check that the exhaust port is not partially blocked. Remove the baffle from the end of the silencer, then wirebrush poke prod scrape and generally clean.

[T-Thunder13]

The GT125 will have a chrome exhasut so the caustic method is the only way for a decoke.

great. i cleand the exhaust today, i found engine degraser helpful too.
now is the dipstick hole on the r/h side of engine for transmission and clutch oil?
what sort of oil is most suitable for this bike and how much should be reading on the dipstick? ( dip stick has no marking) im quite sure that oil is in dire need of a change.
cheers.

[T-Thunder13]

sombody. answer my last question. the weekend is looming and its time to get the tools out.

[Ixion]

If there is a dipstick hole I imagine it's for tranny oil. Not much else it could be. I've found with Suzuki two smokers that any transmission oil indicator (they used dipsticks and oil level screws are always very unreliable (tiny changes in bike uprightness have large effects on apparent oil level). Best to drain the old stuff out and add the correct measured quantity. I use any decent automotive transmission oil, but you can use engine oil. Check the manufacturers specification it depends a bit on whether you have any bevel gears in there.

[Roj]

great. i cleand the exhaust today, i found engine degraser helpful too.
now is the dipstick hole on the r/h side of engine for transmission and clutch oil?
what sort of oil is most suitable for this bike and how much should be reading on the dipstick? ( dip stick has no marking) im quite sure that oil is in dire need of a change.
cheers.

I had one as my first road bike as well, hopefully you have got the 2 stroke oil sorted out, the transmission oil / fluid may benefit the bike if changed, but I never did on my old bike, rode it till it died, could scream along 120-130 ks, when the speed limit was 80.... the memories such a bike brings back...