Author Topic: Anyone know the #4 intake cam lobe proper position for BDC?  (Read 2081 times)

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Offline dave500

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #25 on: December 12, 2019, 01:14:14 AM »
did you put the spark plugs back in?thatll make it tighter.

Offline Scott S

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #26 on: December 12, 2019, 03:10:49 AM »
 Maybe I'm crazy...or maybe the 650 is different (it's been a while since I did one. I need to see if I still have the 650 manual)....but in your pic, you STILL don't have the T timing mark lined up.

 See that upside down K in the F K E? Right below it is an upside down pyramid pointer. The ine on the T should be lined up with that.
 If I'm wrong about the 650, someone tell me and I'll remove this info. The line on the T is to the right of that pointer.

http://forums.sohc4.net/index.php?action=dlattach;topic=180261.0;attach=412350;image
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #27 on: December 12, 2019, 04:18:24 PM »

I'm stuck. Any ideas? The vid just follows what I did to set the timing and at the end I show all three marks lined up as far as I can tell but no difference in trying to start the bike. I can get it to pop with carb cleaner a bit but it won't stick. My plugs are wet. My accelerator pump works, but I doubt that matters.

Can you check ignition timing without the bike running? Last checked compression was 120 except #2 was 90. I'd assume with proper cam timing it would be even better if any.

What should I try at this point? I read somewhere someone jump starting from somewhere in the ignition system, I'm assuming to reinforce the spark or something. Is there something I can try with that on the chance I have a weak spark. I think my spark is good, at least it looks as food as it always has been. Suggestions? Thanks
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #28 on: December 12, 2019, 04:21:36 PM »
Maybe I'm crazy...or maybe the 650 is different (it's been a while since I did one. I need to see if I still have the 650 manual)....but in your pic, you STILL don't have the T timing mark lined up.

 See that upside down K in the F K E? Right below it is an upside down pyramid pointer. The ine on the T should be lined up with that.
 If I'm wrong about the 650, someone tell me and I'll remove this info. The line on the T is to the right of that pointer.

http://forums.sohc4.net/index.php?action=dlattach;topic=180261.0;attach=412350;image

No, my last pic I was just showing where the mark lined up when I had the cam lined up, showing that I fact I had been a tooth off. I'm pretty sure I'm good on cam timing now. Check end of vid above(pls)

I don't have "f k & e" marks. Just "t f" over 1.4 and under "I II s" and I use the "I" over the T to line up with the index mark. I'm pretty sure I got that part good.
« Last Edit: December 12, 2019, 04:24:02 PM by juntjoo »
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.

Offline Scott S

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #29 on: December 12, 2019, 04:28:38 PM »
 Click on the link. It's the pic you posted. The f k & e are on the bolt at the top of the pic. I was referring to the K on that bolt so you could see the pointer just below it.
 You have the line at the T lined up to that pointer when #1 is at TDC?

 EDIT: Just watched the video. It looks like you have the timing right.
 Check the valve adjustment now.
« Last Edit: December 12, 2019, 04:33:39 PM by Scott S »
'71 CB500 K0
'17 Triumph Street Scrambler
'81 Yamaha XS650

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #30 on: December 12, 2019, 05:18:16 PM »
Click on the link. It's the pic you posted. The f k & e are on the bolt at the top of the pic. I was referring to the K on that bolt so you could see the pointer just below it.
 You have the line at the T lined up to that pointer when #1 is at TDC?

 EDIT: Just watched the video. It looks like you have the timing right.
 Check the valve adjustment now.

Okay thanks. I thought that was good since I never touched it last ran
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #31 on: December 12, 2019, 08:41:24 PM »
Awesome. Got it to roar for a sec. Garage is closed though and it's late so I turned it off. Idk if it was the valve adjustments though. Well, what do I know. Probably? Seems like too little of a change. I'll say as usual they are always off whenever I check them. And I tighten them down to spec too with a torque wrench, to 12(lbs per however it's written si?). A couple were loose, a couple tight.

Anyway, anyone got any tips on inserting these heli coil threads? I've done many but lately having trouble especially with this latest set that come sorta stretched out for some reason and are hard to start to thread in and I end up over stretching the tip out with the special tool and ha e to start over and in the past I've accidentally threaded it in on an angle damaging the newly tapped thread I made for it and had to tap another one the next size up. Anyone else struggled with these? Np, I'll google/youtube for some tips...
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #32 on: December 12, 2019, 08:47:36 PM »
did you put the spark plugs back in?thatll make it tighter.

Idk man. These things are a mystery to me. I just got it going and hand cranking it there is a good amount of resistance, which feels right but before I got the cam timing right it felt too easy and with the plugs in.

Hey, you wouldn't happen to have any good pics of the moon from over there would ya mate?
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.

Offline dave500

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #33 on: December 13, 2019, 01:45:33 AM »
why? do you want to howl at it?just out of interest a little known thing,if ya like canned heat the band and Henry Vestine the great guitarist,hes father was an astronomer who has a crater on the dark side of the moon named after him,the vestine crater,Henry who has died wishes his ashes be sent to the moon!
« Last Edit: December 13, 2019, 02:26:30 AM by dave500 »

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #34 on: December 13, 2019, 06:34:19 AM »
why? do you want to howl at it?just out of interest a little known thing,if ya like canned heat the band and Henry Vestine the great guitarist,hes father was an astronomer who has a crater on the dark side of the moon named after him,the vestine crater,Henry who has died wishes his ashes be sent to the moon!

Thanks! Lsd boogie? Amphetamine Annie? Not my Era but I've dabbled. Lol. Never heard of them. Good stuff though.

I'm doing flat earth research. Don't laugh! Question everything. Is that your own pic though? Okay, gotta get a coffee and get my bike going then go pick up my truck that broke down across the state. Got a local mechanic to fix it for $200. Almost let it go to any thief or tow company thinking it would be more expensive repair but it sat at an abandoned gas station for two weeks with the key in the ignition untouched. Anyway..
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.

Offline juntjoo

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Re: Anyone know the #4 intake cam lobe proper position for BDC?
« Reply #35 on: December 13, 2019, 02:22:51 PM »
Anyone know any good links in here or elsewhere that informs on the carbs and their different (channels?), idle, slow, main etc? I can start the bike using the accel pump then it dies. I do also have the carbs open in the back, which was never a problem itself and the exhaust pipes are off if any of that could make a difference. I'm thinking I need to clean some passages in the carbs
-Ben

82 Nighthawk 650..

1982 Honda Nighthawk...

I HAVE A 1982 HONDA NIGHTHAWK FFS! j/k. It's my only bike, my first and last.