Incorrect Timing mark on EX Cam

[Kiwi kid]

Hi everyone,I'm just checking the cam timing on my 1980 750 GSX. On the ex cam it has an arrow 2 instead of a 2 arrow as per the service manual.The inlet cam has the correct stamp.My question is,do I measure 20 cam chain links between the 2 arrows as per the manual,or do I go from the 2 on the ex to the arrow on the inlet cam.Thanks

 

[bwringer]

I'm having trouble picturing the problem -- can you post a photo, and perhaps a scan or photo of the diagram in the manual?

And is this a 16 valve 750?

 

[rphillips]

Both arrows should be pointing at a pin, if the # for the 750 is 20, pin at one arrow is [NODE="1"]Home[/NODE] & pin at other arrow should be [NODE="20"]Classifieds (Road-ready GS's only)[/NODE]

 

[Grimly]

Both arrows should be pointing at a pin, if the # for the 750 is 20, pin at one arrow is [NODE="1"]Home[/NODE] & pin at other arrow should be [NODE="20"]Classifieds (Road-ready GS's only)[/NODE]

Or, in other words.... pin at one arrow is '1' and pin at other arrow should be '20'.

 

[chuck hahn]

Actually arrow ONE ( on exhaust cam ) should be flat with the head surface and pointing to the front of the bike. This in turn put arrow 2 pointing straight up. THE PIN THAT ARROW 2 POINTS AT IS PIN NUMBER ONE. Then you count to pin 20 and put arrow 3 on the intake cam pointing at the 20th pin.

AND you cant mistake cams because the EX cam has the worm gear that meshes with the tach drive gear

 

[rphillips]

Did that mess up because I used the symbol for "and" instead of writing it out? I've seen that before, but it's still hard to believe.

 

[Kiwi kid]

Cam chain marks https://imgur.com/gallery/W6VarZo
the difference here between the cam mark and service manual.

GSX 750 cam timing https://imgur.com/gallery/5WH0KIP

So i have the crank set on 1 4 T
I have 20 pins between the 2 arrows as per the manual. But my [NODE="1"]Home[/NODE] mark is below the horizontal position it should be.
Could this be 1 tooth out on the EX cam.
Forgive my forum etiquette,im quite new to this.
I hope this is ok. Thanks for the help

 

[GregT]

Is the exhaust cam seated properly down into the bearings ? It almost looks as though the caps haven't been tightened down. If everything is down the marks look close enough to me. Where in NZ are you ?

 

[Kiwi kid]

Is the exhaust cam seated properly down into the bearings ? It almost looks as though the caps haven't been tightened down. If everything is down the marks look close enough to me. Where in NZ are you ?

Cams are all torqued down. Its just that the number 1 mark is quite off from that horizontal and below the top of the head. I have had no real issues riding, it was something i noticed doing the valve adjustments. I'm in Christchurch.

 

[GregT]

PM sent. Offer to go and advise.

 

[Kiwi kid]

PM sent. Offer to go and advise.

Thanks Greg,have PM you.That would be appreciated.

 

[Kiwi kid]

I'm having trouble picturing the problem -- can you post a photo, and perhaps a scan or photo of the diagram in the manual?

And is this a 16 valve 750?

Have posted a link to images and yes it is a 16 valve.

 

[chuck hahn]

looked to me that the marks on the 750 timing plate pic is the double advanced line pointing at the timing mark and not the T. The T has a single line at it. recheck what line is actually lined up with the timing mark

 

[Kiwi kid]

looked to me that the marks on the 750 timing plate pic is the double advanced line pointing at the timing mark and not the T. The T has a single line at it. recheck what line is actually lined up with the timing mark

I thought the image had shown that it is lined up to the single line next to the T.
I will double check.

 

[chuck hahn]

roll the engine over and watch the number 1 intake valves open. As they are starting to come back up watch the timing marks and stop with the T line perfectly lined up with the timing mark on the timing plate. IF cam timing is corect the 1 arrow should be very close to level with the surface of the head. More importantly the notches on the right end of the cams should also be paralell to the head surface. If the notches are perfect then they are timed. Can the 1 arrow be a bit off when casted?? yes i suppose its possible. I would trust the end notches 100 percent.

 

[Kiwi kid]

roll the engine over and watch the number 1 intake valves open. As they are starting to come back up watch the timing marks and stop with the T line perfectly lined up with the timing mark on the timing plate. IF cam timing is corect the 1 arrow should be very close to level with the surface of the head. More importantly the notches on the right end of the cams should also be paralell to the head surface. If the notches are perfect then they are timed. Can the 1 arrow be a bit off when casted?? yes i suppose its possible. I would trust the end notches 100 percent.

Are we saying everything should line up with the T mark on the left in the Image?
https://i.imgur.com/Ku1XYTb.jpeg

Did what you said,seems like everything lines up for cylinder 4 and not cylinder 1.
This where the timing marks line up when the Cams and cam markings are the same as the manual,but on cylinder 4.
Unless I'm lost in translation,which i could be.

 

[GregT]

Give me a ring and I'll come over at the weekend. 03 4200497

 

[chuck hahn]

thats not where the ndicator should be pointing. IF you watched the left cylinder (numberb one ) INTAKE VALVES get pushed down by the cam lobes and then you lined bup the line to the left of the T you should have both notches on the right ends of the cams lined up with the surface of the head AND the number 1 arrow should be pointing forward.

 

[Kiwi kid]

Hey everyone,
first off thank you very much for all your help and advice.So today,I pulled the cams out,set them exact as the manual,realign the timing marks,made sure I had 20 pins between the arrows,and Hey presto,she's running bang on.Just need too get a timing light on her.
Not sure what the previous owner had done.