GN125H valve clearance troubles (No clearance?)

**husaberg** · 11th September 2015, 01:26

Originally Posted by h0dgep0dge

Well, the rocker is attached to the head cover, and to get to the gap between the cam and rocker i'd need to remove the head cover. As to why the engine is designed for checking the valve-rocker clearance rather than the rocker-cam clearance, I dunno. Perhaps so that you can both inspect the valve stem and adjust the clearance through the same inspection cover. But seriously, you'd have to ask someone who actually knows what they're talking about

what does that even mean?

The valve clearance is measured between the top of the valves and the rocker ie nowhere near the cam.
there will be inspection holes to measure the clearance through.

**Drew** · 11th September 2015, 06:26

Originally Posted by h0dgep0dge

Well, the rocker is attached to the head cover, and to get to the gap between the cam and rocker i'd need to remove the head cover. As to why the engine is designed for checking the valve-rocker clearance rather than the rocker-cam clearance, I dunno. Perhaps so that you can both inspect the valve stem and adjust the clearance through the same inspection cover. But seriously, you'd have to ask someone who actually knows what they're talking about

what does that even mean?

Originally Posted by husaberg

The valve clearance is measured between the top of the valves and the rocker ie nowhere near the cam.
there will be inspection holes to measure the clearance through.

From my vague memory of doing it once on Al's 125, he's speaking the truth about not being able to get to the cam.

I'm pretty sure the clearances are too tight still. Those springs should be very weeak, the feeler gauge should slide in pretty much unimpeded.

**Kickaha** · 11th September 2015, 06:40

Originally Posted by Drew

From my vague memory of doing it once on Al's 125, he's speaking the truth about not being able to get to the cam.

He is, but there's no reason you would need to

**BASS-TREBLE** · 11th September 2015, 08:16

Originally Posted by h0dgep0dge

Well, the rocker is attached to the head cover, and to get to the gap between the cam and rocker i'd need to remove the head cover. As to why the engine is designed for checking the valve-rocker clearance rather than the rocker-cam clearance, I dunno. Perhaps so that you can both inspect the valve stem and adjust the clearance through the same inspection cover. But seriously, you'd have to ask someone who actually knows what they're talking about

what does that even mean?

It's a hint that maybe taking a good photo and posting it here will make it easier for us to help you out.

**h0dgep0dge** · 11th September 2015, 09:53

Originally Posted by BASS-TREBLE

It's a hint that maybe taking a good photo and posting it here will make it easier for us to help you out.

I didn't need help after I realized the rockers were held down with springs. After that, I was able to take care of the clearance no problem. Also, I'm not going to post a photo because I'd need to take the head cover off again, and like hell I'm messing around with the RTV again.

**husaberg** · 11th September 2015, 11:58

Originally Posted by Drew

From my vague memory of doing it once on Al's 125, he's speaking the truth about not being able to get to the cam.

I'm pretty sure the clearances are too tight still. Those springs should be very weeak, the feeler gauge should slide in pretty much unimpeded.

As kick said why would you need or want to

**Drew** · 11th September 2015, 12:31

Originally Posted by husaberg

As kick said why would you need or want to

Single valve rocker arms, it's usually the easiest place to slide the gauge in.

**husaberg** · 11th September 2015, 12:33

Originally Posted by Drew

Single valve rocker arms, it's usually the easiest place to slide the gauge in.

but its not where the tappet clearance is measured.

**Drew** · 11th September 2015, 12:38

Originally Posted by husaberg

but its not where the tappet clearance is measured.

It differs how?

**husaberg** · 11th September 2015, 12:43

Originally Posted by Drew

It differs how?

As it is not how to measure the clearance it has a two piece head to measure the clearance to the cam and follower base of the rocker would require removing the top of the head
As you remove the top of the head it becomes a pointless exercise. As the rockers are attached to the top part of the 2 piece head. The rocker clearance will be able to be measured with a gps or tape measure.

Use the proper place it has caps to placed by the factory to allow for measurement

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**Katman** · 11th September 2015, 12:51

The rocker arms on a GN125 are not spring loaded.

It must be the valve springs you've been looking at and they have nothing to do with the valve clearance.

(Unless they're broken of course - then you'd have loads of clearance).

**h0dgep0dge** · 11th September 2015, 15:59

Originally Posted by Katman

The rocker arms on a GN125 are not spring loaded.

How do you know this?

No one is going to talk me out of this. Like I've already said, I saw the springs with my own eyes. I took the header cover off (the valve springs stay in the head, and these springs were definitely attached to the head cover) and they were applying a torque to the rocker arm, and therefore a force from the tappet down into the valve stem.

It's possible that I was mistaken about what I saw, but it's very unlikely, and no one is going to convince me of anything else. Maybe a picture of what I saw and an explanation of how it isn't what I thought it is, but "nope ur wrong" isn't going to convince me.

**husaberg** · 11th September 2015, 16:44

Originally Posted by h0dgep0dge

How do you know this?

No one is going to talk me out of this. Like I've already said, I saw the springs with my own eyes. I took the header cover off (the valve springs stay in the head, and these springs were definitely attached to the head cover) and they were applying a torque to the rocker arm, and therefore a force from the tappet down into the valve stem.

It's possible that I was mistaken about what I saw, but it's very unlikely, and no one is going to convince me of anything else. Maybe a picture of what I saw and an explanation of how it isn't what I thought it is, but "nope ur wrong" isn't going to convince me.

Yet none of it is relevant when it comes to setting the tappet clearance.
As much as what 99.99% of what Katman posts is utter bullocks, one thinkg he could do is set the tappets on a GN.
Rather than wasting more of everyone's time who has tried to help you feel free to take it all to bits for no reason at all. Because you feel you know better than mechanics do

**Drew** · 11th September 2015, 16:50

Originally Posted by h0dgep0dge

How do you know this?

No one is going to talk me out of this. Like I've already said, I saw the springs with my own eyes. I took the header cover off (the valve springs stay in the head, and these springs were definitely attached to the head cover) and they were applying a torque to the rocker arm, and therefore a force from the tappet down into the valve stem.

It's possible that I was mistaken about what I saw, but it's very unlikely, and no one is going to convince me of anything else. Maybe a picture of what I saw and an explanation of how it isn't what I thought it is, but "nope ur wrong" isn't going to convince me.

The fact that he's a fucken bike mechanic would be a fairly good reason. The springs you saw locate the rocker sideways I think you'll find.

Sooooo. Nope, you're wrong.