2nd Valve Inspection 07 650R

[howardrichman]

07 650R
2nd Valve inspection @43+mls, 1st done @15.5Kmls
I'm in process of the valve inspection, and dont know what shims are in place. The service manual lists the Exhuast clearance @ .22-.31mm, and the intake clearance @ .15-.21mm. I'm just barely @spec w/ intake@.155mm and exhaust @.225mm. My question is: Should I try to find smaller shims to bring clearances closer to a middle spec setting or looser measure than present? This present measure is what I set on the 1st valve inspection @15.5k mls. Hasn'nt changed since then. Wouldn't be hard while open, but are shims made? According to manual chart, only much larger or smaller is made. Also since open @ this mileage, any other inspection or service should be done? Already replacing plugs and cleaning air filter.                                                                            Please Reply,
                                                                                                                                              Thanks;
                                                                                                                                                           Howie...

[tomek]

Generally speaking clearances get tighter on shim under bucket valve arrangements , of course there are exceptions from that .

I would get them in the middle of the allowed range , most of manufacturers and aftermarket offer shims in 0.05mm steps however Honda has some of them in 0.025mm steps .

I`m a cheap person , I`d simply lapped them slightly on wet 600 paper  to get that extra 0.04mm that you need .
Finish it with 1200 before install .  ( most of the times I have required shims anyway , if I don`t I`m not gonna wait 5 days before dealer gets needed shim because they never have them . Apparently keeping 30 shims in stock would make them go bankrupt .    )
Of course there will be 1200 people here saying that you should not do it but I`ve never had a problem with this 3rd world method . YMMY .

[howardrichman]

Thanks for reply; I'de figure I'de use the existing shims after I recorded their values and values needed for specs , then if needed, use those where needed,and just buy the missing  shims needed for the remainder. It worked the 1st valve inspection.

                                                                                                                      Thanks'
                                                                                                                                   Howie...

[Andrew]

THis might sound like a lot of work for little reward but here goes,

   If you have the cams out and are going to do one shim, (personal preference; stay on the larger side of the gap) pull all the shims and measure them. Write the shim measurements down. This way if/when you have to do a shim swap next time you already know what is there making it a lot easier to order the correct shim needed.  Added benefit is that you may be able to swap shims between valves to accommodate the measurements you are after without having to throw out more $$.

  Knowing what is in there will help out the next time you open it up.

[Specter]

Wouldn't it be nice if new bikes came with the initial shim documentation?

[tomek]

THis might sound like a lot of work for little reward but here goes,

   If you have the cams out and are going to do one shim, (personal preference; stay on the larger side of the gap) pull all the shims and measure them. Write the shim measurements down. This way if/when you have to do a shim swap next time you already know what is there making it a lot easier to order the correct shim needed.  Added benefit is that you may be able to swap shims between valves to accommodate the measurements you are after without having to throw out more $$.

  Knowing what is in there will help out the next time you open it up.

+1 .

 Another thing ,  numbers  might not be readable , get a basic micrometer , something from Harbor Freight/auto parts store is good enough for this job . It is only a couple of bucks but it can simplify the operation tremendously .

Every member of STN should own micrometer anyway .  

[howardrichman]

Yep; It's the only way to do it accurately. Not one shim under bucket was to value of stamp. You have to measure each one; and record all shims. Right now I've got the EX shims @ 3.05 mm, 3.00 is too small to be within spec, not sure if shop has any in between.  

                                                                                                                                                                      HR...

[howardrichman]

I was having a hard time finding TDC for both cylinders. I was probably finding the exhaust stroke; and was measuring overlapp of both intake and exhaust valves. What i did was to just rotate the intake cams so all 4 lobes were at 60deg. and took measurements, and did same for exhaust valves. Any problem with that?  All clearances measured accurately. I did it this way on my 1st valve check, and no problem.

                                                                                                                                                                                   Please reply;
                                                                                                                                                                                               Howie...

[howardrichman]

thanks for reply;
I thought I'de be all right w/ that method of measurement. Now I'm planning on inspecting  the vacuum sync  of the thottle bodies. I'm not sure what or where to buy vacuum guages. I think I have a decent digital tach, and hope I have a mini or a flex driver for those vacuum screws. Should I use vacuum guages or a manometer?  
                                                                                                                                                                                       Howie...