When I bought my current GT550 I was given a Suzuki published 550 service manual. I was flipping through it and happened upon the timing procedure.. It says the timing marks on the casting are for emergency purposes only. A dial gauge must be used, Well OK. It gives the spec at 3.37mm (.132) BTDC. But then it goes on to give a tolerance on that spec.of 2.85mm (.112) to 4.24mm (.170). WOW! That's a lot! A difference of 1.39mm (.058)) I would be willing to bet good money that the casting marks are well within that range.
None of this has any particular importance. I was just amazed at the tolerance.
Timing Tolerance. WOW that's a country mile.
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Timing Tolerance. WOW that's a country mile.
I was born with nothing and still have most of it left.
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1978 GS1000C
1976 GT550 ongoing money pit.
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1978 GS1000C
1976 GT550 ongoing money pit.
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Re: Timing Tolerance. WOW that's a country mile.
It is very wide tolerance, I guess it shows that Suzis are not fussy about the timing being spot-on, unlike rival brands 

1976 GT380 - wounded by me, and sold on
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed
2006 SV650S - killed by a patch of diesel and a kerb in Feb 2019
2017 SV650 AL7 - naked and unashamed
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Re: Timing Tolerance. WOW that's a country mile.


Cheers,
Roger
GT750Battleship.