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PostPosted: Sun May 03, 2020 1:11 am 
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On the street

Joined: Sun Mar 10, 2013 4:08 am
Posts: 11
Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
You have a gt550 hydro, meaning a watercooled one? You build it yourself?

The 2 stroke virus bit me in my teens, never went away. Great machines, specially whem you have more of them to play with :up:

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PostPosted: Sun May 03, 2020 5:01 am 
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To the on ramp

Joined: Sat Sep 05, 2015 3:14 pm
Posts: 269
Location: southeast pa
Country: us
Suzuki 2-Strokes: GT
Sorry sometimes spell check doesn't like words like hydrolock
Hydrolock is when you get to much fluid in cylinder and it wont allow the piston to compress, it can be very damaging to an engine.
I removed the drain bolts from crankcase and it had lots of 2 stroke oil in cylinders. I need to address the check valves in the oil lines.

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


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PostPosted: Mon May 04, 2020 2:54 am 
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On the street

Joined: Sun Mar 10, 2013 4:08 am
Posts: 11
Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Ah yes, could cost you a crankshaft, a rod and even the casing.
But the oilpump shouldn't allow oil to run true without running, and the oillines have valves blokking oil from flowing back to pomp.

oilpomp failure?

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PostPosted: Mon May 04, 2020 7:25 am 
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To the on ramp

Joined: Sat Sep 05, 2015 3:14 pm
Posts: 269
Location: southeast pa
Country: us
Suzuki 2-Strokes: GT
The pump really doesn't stop the flow, the check valve in the oil lines stop the flow to the cylinders, the vacuum from the cylinder or pressure from pump (not sure which)is what opens the valve.

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


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PostPosted: Mon May 04, 2020 7:46 am 
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On the street

Joined: Sun Mar 10, 2013 4:08 am
Posts: 11
Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Hmz.. strange.. oilpump regulates the amount of oil, f the engine is not running there is no oil. Is it stuck in full throttle position? Then it gives way to much oil. I know the sartup procedure after rebuild or empty oillines is start the bike, let it idle and manually put the oilpump in full throttle position until all lines are full. Then you drain the oil via the bolts you also mentioned.



Curious to know what the problem is/was :up:

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PostPosted: Wed May 06, 2020 4:17 am 
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To the on ramp

Joined: Sat Sep 05, 2015 3:14 pm
Posts: 269
Location: southeast pa
Country: us
Suzuki 2-Strokes: GT
Paulini wrote:
oilpump regulates the amount of oil, f the engine is not running there is no oil

The oil pump pressure is what opens the check valves, that is how it regulates the oil,the upper cylinder oil amount is regulated by the piston stroke in the pump,controlled by throttle,lower lines feeding bearings at constant amount.
When setting, gravity will flow oil through the pump and through leaking check valves and into crankcase. That is why you fill the lines with oil and hang with banjo down to test, if the oil drains out you have leaking valves.

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


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PostPosted: Thu May 07, 2020 10:33 am 
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On the street

Joined: Sun Mar 10, 2013 4:08 am
Posts: 11
Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Lesson learned, thnx

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