72 GT380 First Start Up

General discussion about Street two-stroke Suzuki motorcycles.

Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan

Post Reply
grumpy56
To the on ramp
Posts: 218
Joined: Thu Nov 20, 2014 11:08 pm
Country: USA
Suzuki 2-Strokes: 1970 T350 Restored; 1972 GT380 Build
Location: Yorba Linda, CA

72 GT380 First Start Up

Post by grumpy56 »

Hello All. Finally nearing completion of my "build from parts" 380. Any suggestions on how to ensure oil is getting to cylinders/crank? I have the old red colored oil lines and I don't know if I'll be able to to see the oil getting past the check valves (oil pump held wide open). My oil lines came with the motor that had a new middle cylinder piston in it that had never been run. That concerns me about ensuring one or more of the valves are not blocked or the oil pump is working. I did not notice any problems with the engine on complete disassembly and rebuild. Any suggestions/help appreciated.
User avatar
Alan H
Moto GP
Posts: 3172
Joined: Thu Feb 16, 2012 11:50 am
Country: England
Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
Location: The Republic of South Yorkshire

Re: 72 GT380 First Start Up

Post by Alan H »

Put some oil in with the petrol to ensure 'some' lubrication is getting where it's needed, and wedge the oil pump lever to maximum open. When the bike settles to a fast tickover (1500 rpm or so) it will start to smoke heavier - hopefully on all 3 cylinders. That's when you know oil has got through.
Make sure the pump 'wedge' is removed before you go out for a run - the pump will return to normal if the engine is running.
Think of how stupid the average person is, then realise that half of them are more stupid than that.
grumpy56
To the on ramp
Posts: 218
Joined: Thu Nov 20, 2014 11:08 pm
Country: USA
Suzuki 2-Strokes: 1970 T350 Restored; 1972 GT380 Build
Location: Yorba Linda, CA

Re: 72 GT380 First Start Up

Post by grumpy56 »

Thanks Alan. What ratio of oil in petro would you suggest?
User avatar
Alan H
Moto GP
Posts: 3172
Joined: Thu Feb 16, 2012 11:50 am
Country: England
Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
Location: The Republic of South Yorkshire

Re: 72 GT380 First Start Up

Post by Alan H »

An eggcupful in a gallon of petrol should be enough.
I always use 'super' fuel - none of that veggie stuff!
Think of how stupid the average person is, then realise that half of them are more stupid than that.
grumpy56
To the on ramp
Posts: 218
Joined: Thu Nov 20, 2014 11:08 pm
Country: USA
Suzuki 2-Strokes: 1970 T350 Restored; 1972 GT380 Build
Location: Yorba Linda, CA

Re: 72 GT380 First Start Up

Post by grumpy56 »

Will do and TY!!!
Post Reply