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Go Back   DCSportbikes.net > Sportbike Operation > Test and Tune

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June 18, 2003, 12:58 AM

Thanks Mike (Taskmasta) for the VFR shop manual on CD. No wonder everyone recommends that you get one of these. Incredible amount of information on almost 700 pages. I now know why the valve inspection and adjustment on the V-TEC is a little more complicated, but also realize that it's not rocket science. You simply need to install a slide pin stopper in the slide pin holder which is in the valve lifter on the V-TEC valves (presumably to force engagement of the slide pin and the valve) so that you can measure valve clearance. The only other apparent difference is that the V-TEC side does not use shims, so you in order to adjust valve clearance, you must install a different size valve lifter. Really helped to de-mystify the process. I've never done a valve adjustment before, and don't plan on experimenting on my VFR, but at least now I know what's invovled, and can talk to the mechanic before hand to see how well he understands the process before he does it.

So much information in this thing! Explains how to check for worn axle bearings, swingarm bearings, steering head bearings, inspect the linked branking sysemt, etc, and that's only part of Chapter 3 Really impressed!

[Edited on 6/18/2003 by rddy]
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June 18, 2003, 01:57 AM

Damn, I'm a friggin nerd, but I love this thing! I had read an explanation of how V-Tec worked in theory when I got the bike last year, but couldn't really visualize it. I knew that there was a pin that was somehow engaged causing the valve to open, but couldn't put the whole thing together. I sat here and broke it down after looking through the valve adjustment section, but was still missing a piece. I learned that the valve lifter had a slide pin holder in it which told me that that is where the pin was, but couldn't figure out how it was engaged (being inside the valve lifter and all), and how did the valve not operate when the pin was not engaged. I mean the valve lifter obviously would move as the cam turned. Ok, well if the valve lifter was moving but the valve was not, clearly it must mean that the valve is not directly connected to the valve lifter. OK, then that is where the slide pin holder must come into play. I figured that since the valve moves independently of the valve lifter there must be another spring involved to force the valve lifter to return independent of the valve spring. Voila, the inner valve spring operates similar to any valve spring, and there is an outer valve sping that returns the valve lifter. Ok so the only remaining piece to the puzzle was, how does the slide pin engage to allow the valvle lifter, slide pin holder, and valve to move as one. I then noticed that there was a hole in the side of the valve lifter. So that clearly would play a part in how the pin was engaged. Finally noticed that at the end of the manual there is a chapter entitled "Technical Feature" that has a complete description of how it works. There is a valve that sends oil to the valve lifter bore and through the hole in the side of the valve lifter and the oil pressure engages the slide pin!! Duh!

I love breaking things down and trying to figure them out! It's even more fun if at the end of it all, it seems to make some sense!


[Edited on 6/18/2003 by rddy]
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June 18, 2003, 07:56 AM

It's also good when you put it all back together and you don't need any more parts or have any left over .


Ride Hard or Put it Away. Trickn is life.
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June 18, 2003, 01:30 PM

Was thinking about this some more and wondered whether the hole in the valve lifter (which I now understand is also referred to as a bucket) has to be aligned in a certain way for the system to work, or if there is a galley (is that the word I'm looking for?) around the entire valve bore to allow oil to reach the slide pin regardless of orientation. If the former, I did not see anything in the diagram to suggest how such alignment is maintained. Figured that I might find something on the net discussing V-TEC given all the Honda cars running around with V-TEC. Turns out the system in the cars is entirely different (but also pretty cool using an extra cam lobe and rocker!( http://auto.howstuffworks.com/camshaft3.htm - cool site). Oh well. :dunno:
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June 18, 2003, 02:05 PM

NERD!!!!! lol nah I got my Manuals on CD a while back.. Mine came with like history of the GSX-R and other neat little things which makes it cool!

-Leon
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June 18, 2003, 02:39 PM

CD? BAH! What? You're going to bring your PC into the garage?

I like my old-guard paper manuals with the grease marks from my hands.

EDIT: typo

[Edited on 18/6/2003 by hayabusafiend]


-- Chris
BMW R1100s
(previous rides: '82 KTM250, '95 CBR600F3, '98 Buell S3T, 2000 Hayabusa, 2008 R1200R)

"Any sufficiently advanced technology is indistinguishable from magic." -- Arthur C. Clarke
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June 18, 2003, 05:07 PM

That's what printers are for Chris! Get em as greasy as you want, and print new ones!!
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