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Suzuki GT550 L 1974 Lost cause

Posted: Tue Jun 30, 2020 12:57 am
by Hush
Always wanted one of these big two stroke beasts sine the 70's. Bought this ruin for too much money, turned out the front wheel and the frame where the only parts worth having, everything else was toast or wrong. Had J model front forks that were too loose for the triple tree, tank was J too, seat was rubbish, engine turned over amazingly well and when I got the head off i found out why...no pistons! Gearbox was full of rusty water, crank was ruined. Basically I have had to buy this bike back 3 times with parts scavenged, donated and purchased at horribly inflated prices from around the world.

Re: Suzuki GT550 L 1974 Lost cause

Posted: Tue Jun 30, 2020 1:06 am
by rodent
I don't believe you're a "pioneer" :(

Re: Suzuki GT550 L 1974 Lost cause

Posted: Tue Jun 30, 2020 6:09 am
by jabcb
Congrats on having the backbone to see this dream project through to completion. :up:

Re: Suzuki GT550 L 1974 Lost cause

Posted: Wed Jul 01, 2020 12:31 am
by Alan H
Hope the original seller recovers soon.
I suspect words were said....... :roll:

Re: Suzuki GT550 L 1974 Lost cause

Posted: Mon Jul 06, 2020 3:20 am
by Hush
So to give some background to this money pit I call a bike lol. The tank was J model, the forks were also the thinner J ones so would never have worked, the main stand was missing, it only had one pipe and that was cracked, the seat was also a mismatch, no headlight, engine had no pistons and the cases were held loosely together with one bolt. The rear wheel had broken spokes, handlebars were bent. In the end I figured out I had a frame, a front wheel, a set of carburetors and some engine cases, not much for $1125 but hey I had a GT550 (Well some of it).

Re: Suzuki GT550 L 1974 Lost cause

Posted: Mon Jul 06, 2020 3:23 am
by Hush
Now I needed an engine and plan "A" was to buy a runner from somewhere but there was nothing around so I was forced to use what I had.

Re: Suzuki GT550 L 1974 Lost cause

Posted: Mon Jul 06, 2020 3:31 am
by Hush
The rebuild was held up as I hunted for pistons, it turned out one barrel was 0.05 already and the other two were std so not a set, these I had bored to match at 0.5 and finally found some pistons in Australia.

Re: Suzuki GT550 L 1974 Lost cause

Posted: Tue Jul 07, 2020 1:21 am
by Hush
Today's mission was fitting the oil lines and refitting the starter motor which now works great. Minor annoyance is I can't get the neutral light to show, It works if I ground the blue wire from the clocks but when hooked up to the sender blue wire from the sender unit I get zip? I can't spin the engine to allow the gears to move as I still have the carbs and oil pump off. I may put the sprocket cover on so I can activate the clutch which will let me move through the gears.

Re: Suzuki GT550 L 1974 Lost cause

Posted: Tue Jul 07, 2020 6:59 pm
by karl pa
Looking good :up:

Re: Suzuki GT550 L 1974 Lost cause

Posted: Sat Jul 11, 2020 12:45 am
by Hush
Nuts, one of the exhaust manifold bolts has decided to spin and not catch a grip, have bought a Helicoil to fix it. Throttle cables and tacho cable has arrived, bit scary as when the oil pump parts arrive I may actually have to try starting it!

Re: Suzuki GT550 L 1974 Lost cause

Posted: Tue Jul 14, 2020 3:13 am
by Hush
Helicoil successful, exhaust tightened, ram-air covers fitted, new stainless steel cover bolts purchased for oil pump. 6 oil pump seals ordered from local Suzuki dealer, awaiting oil pump drive pin and main oil pump seal from Ebay. Seat pan at engineering shop to be rebuilt. Correct front guard purchased from Canada ($220) also seat hinges, locking plate and air box cones from same seller.

Re: Suzuki GT550 L 1974 Lost cause

Posted: Tue Jul 14, 2020 7:42 pm
by Cliff56
Hush wrote:Helicoil successful, exhaust tightened, ram-air covers fitted, new stainless steel cover bolts purchased for oil pump. 6 oil pump seals ordered from local Suzuki dealer, awaiting oil pump drive pin and main oil pump seal from Ebay. Seat pan at engineering shop to be rebuilt. Correct front guard purchased from Canada ($220) also seat hinges, locking plate and air box cones from same seller.
Parts are on their way from Canada!!

Re: Suzuki GT550 L 1974 Lost cause

Posted: Wed Jul 15, 2020 1:15 am
by Hush
I hope so lol. :D

Re: Suzuki GT550 L 1974 Lost cause

Posted: Sat Jul 18, 2020 5:57 am
by Hush
Gear shifter has no return happening, had to remove the clutch cover and reset the gear shift spring, no one tells you about these things! My Clymer and Haynes manuals never mentioned anything about putting tension on that spring. So while I'm in there I sorted the kick starter out too, finding those two tiny punch marks is nearly impossible. Next mission was the gear indicator, I removed it and took it apart, cleaned the tiny brass pick-ups and put it back on, it has no issue showing 2nd 3rd 4th 5th but neutral and 1st are hard to find or stay on. Possibly some readjustment of the unit will help.

Re: Suzuki GT550 L 1974 Lost cause

Posted: Sun Aug 02, 2020 7:12 pm
by Hush
Added a new stainless steel bolt to the earth side of the sender and it worked perfectly, seems the original bolt was just old and crusty and not making good contact. Tested plugs, can only get a weak red spark on all plugs, 40 year old condensers and points probably didn't help so have ordered new ones. :roll: