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Author Topic: 74 Tm timing BTDC please  (Read 5524 times)

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Offline Freakshow

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74 Tm timing BTDC please
« on: October 10, 2011, 12:42:39 pm »
anyone kow off the top of there head  the74 Tm timing BTDC please ? is it like 2.3mm ??  i cant find the book
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Offline Freakshow

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Re: 74 Tm timing BTDC please
« Reply #1 on: October 11, 2011, 12:44:04 pm »
Surely someone must know ????
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70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline brent j

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Re: 74 Tm timing BTDC please
« Reply #2 on: October 11, 2011, 03:09:35 pm »
I'll check at home tonight. I know I've read it but can't remember off-hand
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Offline Freakshow

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Re: 74 Tm timing BTDC please
« Reply #3 on: October 11, 2011, 03:43:45 pm »
same i thought maybe 1.8 or 2.3 but im guessing, did a quick net search and came up empty
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74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline brent j

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Re: 74 Tm timing BTDC please
« Reply #4 on: October 11, 2011, 05:42:58 pm »
Freaky from your other post I see you want the specs for a 250? I just assumed (that word again) it was for a 125. I have the numbers for a 250 as well
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Offline suzuki27

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Re: 74 Tm timing BTDC please
« Reply #5 on: October 11, 2011, 05:55:37 pm »
Freaky ,on my RH 250 with a bore & stroke of 70 x 64mm the ignition timing is set at 2.7- 2.8mm BTDC.
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Offline brent j

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Re: 74 Tm timing BTDC please
« Reply #6 on: October 11, 2011, 09:41:34 pm »
Sorry Freaky, my service data book doesn't give a timming setting for TM's.

The only timming setting I have is for a 125.
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Offline Freakshow

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Re: 74 Tm timing BTDC please
« Reply #7 on: October 11, 2011, 11:18:25 pm »
i got three motors here none with the stators on them, youd think i would have checked on that, before i pulled them all off at some point.... doh
must be an online manual somewhere.
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline Freakshow

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Re: 74 Tm timing BTDC please
« Reply #8 on: October 12, 2011, 12:14:34 pm »
yoUR KILLING ME WHERE ARE ALL THE sUZUKI FILE S?  dOC SURELY ONE OF YOU GUYS WOULD KNOW THIS PRITY BASIC NUMBER ?????
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline halo1963

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Re: 74 Tm timing BTDC please
« Reply #9 on: October 12, 2011, 11:59:23 pm »
From the Clymer Manual (only lists RL AND TS 250)

on PEI modles, Ignition timing is set when the mark on the stator plate is centred at the top mounting screw
the figures given above are used to check the advance built into the black-box circuitry.These figures are checked using a degree wheel and a timing light.
Timing Inch (mm)16 degrees at 1000 RPM
Degrees (BTDC) 24 degrees at 6000 RPM

However in the specification section it statesTM 250 = 21.5 at 6000 RPM

the Suzuki 1972 service manual (the only one that I know of that is TM250 specific and have)
States 21.5 at 6000 rpm (BTDC)
Hope that helps
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Offline Freakshow

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Re: 74 Tm timing BTDC please
« Reply #10 on: October 13, 2011, 12:41:54 am »
YEr thanks for looking but i got that same manual.  DOh..
It unfortunatley talks in degrees and i dont do degree wheels, i use a Dial gauge so i was hoping somewhere out there was the spec in MM.  Anyone now how to change degrees into a mm BTDC statement ?
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

Offline halo1963

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Re: 74 Tm timing BTDC please
« Reply #11 on: October 13, 2011, 12:59:21 am »
Not sure how the dial works

How ever to convert degrees in to mm you only need to know the diameter of the circle.

My stator plate is 120 mm O/D so 120 x 3.1416 = approx 377mm this is the circumference of the stator
so divide it by 360 and you have one degree then times it by 21.5 and you get 22.5 mm

Does that help
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Offline tony27

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Re: 74 Tm timing BTDC please
« Reply #12 on: October 13, 2011, 05:20:32 am »
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Offline Freakshow

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Re: 74 Tm timing BTDC please
« Reply #13 on: October 13, 2011, 11:15:01 am »
Wow thats all abit above my brain and skill set.  I just need a number BTDC in MM.  IF it was a yamaha :O), be easy as.

ill ring up the local Suzi place they must have an old service sheet with it on.  I just figured all you suzi gurus would know this off ya head.
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74 Yamaha YZ's - 75 Yamaha YZ's
74 Yamaha  flattracker's
70  Jawa 2 valve speedway's

For sale -  PRE 75 Yamaha MX stuff, frame, motors and parts also some YAM DT1,2,A and Suzi TS bikes and stuff

monaro308

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Re: 74 Tm timing BTDC please
« Reply #14 on: October 13, 2011, 01:11:53 pm »
Freaky,so far everything i've looked up on TM250 timing on Lukes suzuki tech manuals,they all say "PEI" for BTDC mm...every other bike non PEI has the timing spec.
I've been looking and come up with nada so far.
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