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Gt 550 (1977) Transmission check

Posted: Fri May 25, 2018 4:43 pm
by Dave Robbo
Hi guys im new to the forum i've just treated myself to a second bike which is in decent shape. Im looking to check transmission oil but cant find any information including in the clymer manual. So how do you check it and were? Thanks in advance.

Re: Gt 550 (1977) Transmission check

Posted: Fri May 25, 2018 6:42 pm
by Cliff56
Look for a screw in the clutch cover, right behind the brake pedal. You'll need a 10mm socket or large philips screwdriver.
Remove the screw and that's your oil level!
It's number 36 in the picture. Just ahead and a bit below the kickstarter shaft.

Re: Gt 550 (1977) Transmission check

Posted: Sat May 26, 2018 1:10 am
by GTandcbr
Just my personal view. I never use the oil level plug I always measure the quantity IN and OUT with a suit able measuring jug. I don't know which of your listed bikes you are doing but the amount of transmission oil required is cast into the cover near to the filler neck.

Re: Gt 550 (1977) Transmission check

Posted: Sat May 26, 2018 7:15 am
by Dave Robbo
Cheers guys im talking about the 550 Gt

Re: Gt 550 (1977) Transmission check

Posted: Sat May 26, 2018 7:38 am
by GT750Battleship
GTandcbr wrote:Just my personal view. I never use the oil level plug I always measure the quantity IN and OUT with a suit able measuring jug. I don't know which of your listed bikes you are doing but the amount of transmission oil required is cast into the cover near to the filler neck.
yes, so do I, see my Post ''Oily Exhaust''

Re: Gt 550 (1977) Transmission check

Posted: Sat May 26, 2018 8:49 am
by jabcb
You can see the oil level if you look down the crankcase oil filler hole.
So you can keep track of the oil level if you do something consistent like leave the bike on the center stand overnight.

This works for the twins, GT750 & GT550 but not the GT380.

Re: Gt 550 (1977) Transmission check

Posted: Sat Jun 02, 2018 6:10 am
by Dave Robbo
Very helpful all the above and a last question. Which is the transmission drain bung ? i've looked under the case and can see two around 17 mm approx ?

Re: Gt 550 (1977) Transmission check

Posted: Sat Jun 02, 2018 7:26 am
by jabcb

Re: Gt 550 (1977) Transmission check

Posted: Sat Jun 02, 2018 8:11 am
by GTandcbr
The bolt that is flat to the case is the sump plug the one at an angle is the detent plunger spring bolt. Try not to disturb that one it affects gear changing.

Re: Gt 550 (1977) Transmission check

Posted: Sat Jun 02, 2018 12:43 pm
by Dave Robbo
thanks guys a big help.