Question about 1978 Yamaha TX 750

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I need to know what the marks on the timeing gear are in degrees the far right has a ''T'' under it and then there are 3 more the the left of that one what one is the 10 deg mark ?

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"T" = Top Dead Center, 1st mark to the left is 4 deg BTDC, 2nd mark to the left is 8 deg BTDC, 3rd mark to the left is 37 deg BTDC.
Above is shown in the drawing on this web page:

http://www.tobyfolwick.com/tx750/textual/timing.php

Also shown in the factory service manual under setting ignition timing. I no longer have my factory book, I gave it the guy who bought my TX750 in 2000.

Posted on Oct 13, 2009

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The T is top dead center the first make to the left is 10 deg

Posted on Apr 13, 2009

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What the mechanic is talking about is the degree of the camshaft gear to the crankshaft. The easiest way to do this is with a degree wheel, but the timing degree should not have changed during rebuild and is pretty hairy to change manually. The marks on the flywheel are degree marks, and there should be 1 timing mark. You will have to find out from a kawasaki dealer which mark to use for correct timing. Hope this is what you were needing, Daniel.

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The manual shows the gear as having 3 slots and 1 hole that lines up with the tip of the cam lobe. If the engine is at TDC and the timing marks level w/ the top of the head, the exhaust cam gear hole and lobes should be at 10 o'clock, the intake cam at 2 o'clock.I have had this happen on a YZ-F before, it doesn't have to be off but a degree before it doesn't run right. Good luck!

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Does the t.d.c mark have to be in the inspection window when replacing the cams/gears when re-building the engine I can't get the timing mark to line up exactly?


Nice bike. I have an XLCH1000
If the marks don't quite line up. ensure it is TDC and not the rear piston, it will be a few degrees out!
Placing the cover back on is fun, When timed place the cover on as far as you can get it then turn ther rear wheel by hand and press the cover on. It is a bit fiddly!

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NOTES:
The cam gear has 2 holes opposite from each other, some have slash marks.
Those marks will be parellel with the head once the timing chain is on.
Both intake and exhaust valve will be closed.
If the lobes on the cam are up, then your 180 degrees out and need to flip it over

Assuming the jug is on , and motor is on TDC, install the head, hold the cam with the cam gear attached tand place it in the head with the lobes down in its place, look at the marks on the cam gear and keep them parellel with the head, put the timing chain over the cam gear carefully.
once the chain is on, check that the motor didn't move and is still on TDC, and that when you lay the cam all the way down, the cam gear marks are parellel with the head.

If the marks are parellel and motor is on TDC, now you can put your rockers back on and adjust your valve clearance. .03 intake .05 exhaust

Install you exhaust, intake , carb, etc and fire it up.

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How to set points


Remove spark plugs to make engine easier to turn over.
Rotate engine until etched line on points cam lines up with the rubbing block on one of the points.
Set gap to .015"
Rotate engine 180 degrees and repeat.
Reinstall spark plugs.
Hook up timing light to left hand spark plug (cylinder #1)
Start bike and hold throttle about 2500 RPMs.
Shift point breaker plate left/right until timing marks align.
Hook timing light to #2 cylinder.
Run @ 2500 RPM.
Adjust remaining point sub-plate (on main point plate) until sceond timing mark aligns by timing light.

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Yes, the Honda manual is incorrect. Set the crank pulley at T1 with both camshaft pulley marks lining up. At this point you can install the right hand side camshafts all as per the manuals instructions. The manual is correct up to this point. Now turn the crank pulley clockwise until the T4 mark lines up and install the left hand side cams. Make sure the cam lobes for no 2 cylinder are facing each other and the lobes for no 4 cylinder are facing away from each other. The two dots on the cam gears will align up with the cylinder head surface. Cylinder identification as seen from sitting on the bike. Right hand side front is no 1, Right rear is no 3. Left front is no 2 and guess which one is no 4? Hopethis helps

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2 Answers

Yamaha VStar 1100. Valve train noise after starter clutch repair.


The cam chain has stretched a bit making it look like its half a tooth out, the tensioner takes up the slack but makes the cam timing slightly out.
You could have timed the crank 280 degrees out
It should be timed on the T mark for one cylinder & on the I mark (if there is one) for the other.
The marks before the T mark are for ignition timing (firing marks)


Good Luck
Hope this helps.
(If it does then please mark this as 'useful')
Ride Safe
Bike-Doc

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Timing chain 110 hymoto pit bike


Put the piston at TDC (Top Dead Center) by lining up the timing marks on the flywheel and stator. Put the cylinder head back together with the cam installed so the high points of the cam lobes are pointing kind of downward. Pull the cam chain taught on the front side of the engine. Put the chain on the cam gear such that, when bolted to the cam, the index mark or marks are in the proper position.

The proper position depends on what markings are on the cam. Some bikes have a single mark; an arrow, a straight line or an "O". The mark should line up with the center-line of the crankshaft. If the cam has two marks opposite each other, the lines should be parallel with the gasket surface. You will need to rotate the unbolted cam left or right just a bit in order to match up the bolt holes to the gear holes.

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