valve adjustment

[Guest]

I'm planning on doing a valve adjustment on the winter project 450 soon. The service manual says to check gap for both exhaust and intake lobes perpendicular to cylinder head. But Basscliff instructions says to do exhaust parallel to the top of engine case and intake perpendicular. So which should I do? Thanks terrylee

[Redman]

I was involved in such a discussion a couple weeks ago (although relative to GS1100G, 2 valve per cyl). Was 3 of us that had differening ideas from past expereince. And were trying to work together on one bike. All I knew is what the factory manual said, which showed a diagram of lobes almost parrellel with the head, still above some, but definaitly not perpendicular. We check a few of the clearances at postion showed in book and also at perpendicular. Could not notice a difference with the feeler guages we had.

Maybe best to follow whichever manaul is more specific to your engine.

.

[1948man]

As I remember, BassCliff's guide pertains to the GS 850 and probably most other similar-sized 8 valve motors. Not sure about the 450.

[Jagir]

This is from the Haynes GS400 - 450 manual. Hope it helps.

[Redman]

This is from the Haynes GS400 - 450 manual. Hope it helps.

That is interesting. The manual talks about the position of the notch(es). Other manuals talk in terms of the position of the lobe(s).

.

[Nessism]

That is interesting. The manual talks about the position of the notch(es). Other manuals talk in terms of the position of the lobe(s).

.

Notches are parallel to the lobes.

[Steve]

I'm planning on doing a valve adjustment on the winter project 450 soon.

Don't forget to request your own copy of my spreadsheet. I know my sig talks about "8-valve engine" and yours is only a 4-valve, but it really means "your engine with shims for adjustment", but I can't put that many more characters into my sig.

The 'sheet will work well for your engine, you just won't have to fill in all the boxes.

.

[BassCliff]

Hi Mr. terrylee,

Yes, the guide on my site is for an 8-valve engine. The twins are the same principle but a little different procedure. There is a video of the twin cylinder procedure. You can find the link on my site in the "Engine Odds and Ends" section. Or just click below...

Valve Adjustment Video: Kerry Burton of GStwin.com has put together a very informative video chronicling the process of valve adjustment on his GS500. The procedure will be the same for all GS twins. The principle is the same for all 2-valve per cylinder GS motors.

CLICK HERE to go to the Google video.

The video is very informative.

Thank you for your indulgence,

BassCliff

[terrylee]

Thanks guys! Especially the video! I think I got it. Have done my 850s, but just wasn't sure on 450. terrylee