DOHC "HP2" motor in all BMWs

[leafman60]

Hey guys, what type of valve lash adjust mechanism is designed into the "new" dohc boxer ? Is it shim-and-bucket ? adjusters ?

Seems a done deal the BMW is working a version into the other boxer bikes, including the next GS.

[NakedRider]

It's a half domed shim.

[leafman60]

Can you please elaborate ?? And, what does a valve adjustment entail ??

[Guest24]

If you are familiar with Ducati valve adjustment, the HPS is much the same. You adjust with shims.

[roger albert]

quite a bit different than the desmo ducati valvetrains actually (half as complex, and maybe 1/3 the effort) but much like all the japanese valvetrains of late. Just replace the shim after removing cam (or in some cases such as coming s1000rrr etc, a follower)

[ckcarr]

Originally Posted by NakedRider

It's a half domed shim.

Named after that famous spot in Yosemite.

[NakedRider]

Originally Posted by ckcarr

Named after that famous spot in Yosemite.

Ummm, not exactly.

It is a bit more work to get to it. I reviewed the reprom program for the bike and decided to let the dealer do it.

I think for those that are so inclined you could check the gaps and just order the ones you need, keeping each one that's replaced in case it works in the future.

Has anyone actually done this on their HP2S?

[Bob Hancock]

For us do-it-yourselfers, the crunch will come when you get to buy a shim kit. (I have shim kits for two and four valve Ducati's and they aren't cheap.) When you don't live close to the dealer it'll be hard to measure and go buy, so having a supply will be the easy way, if affordable. Wonder how much those puppies are.

[roger albert]

Good point. I've not bothered with that for the HP since there are so few. I really only have full kits for 2v and 4v ducs, and suzukis -- don't even have FULL kits (though close) for the two types of BMW K-bikes, as they need changing SO infrequently. About to breakdown and start doing Yamahas, as I had 4 r1/r6 riders ask about me doing off-season ones in one weekend. Time to ante up. If the dohc-boxer goes into wider production, that'll have to come too. Darn, always a new expense.

[Bob Hancock]

I got my Ducati shims for less from EMS Ducati 2 Valve and 4 Valve Adjustment Shim Kits. It sure would be nice to find a similar supplier for the BMW shims. Being such a boxerphile I can see one of these in my future.

[Guest24]

Originally Posted by roger albert

quite a bit different than the desmo ducati valvetrains actually (half as complex, and maybe 1/3 the effort) but much like all the japanese valvetrains of late. Just replace the shim after removing cam (or in some cases such as coming s1000rrr etc, a follower)

I was addressing the what as opposed to the how, Roger. The CD that comes with the bike outlines the how if I remember correctly. I keep the disc in NC.

[markjenn]

While not recommended by the mfgs, some folks I respect say you can hand-grind the under-bucket shims yourself and take off a few .1 mm and keep them essentially flat. I don't do it, but many do. This is one solution for the typical tightening valves if you're comfortable with it.

Personally, on all my shim-adjusted bikes, I don't get shim kits - I just do the valve adj during winter maintenance when the bike is down for other things and when I have plenty of time to leave the bike sitting while I source the correct shims. Some dealers will do trades.

For shim-adjusted bikes with relatively long check intervals, there is no reason to be obsessive about doing the valve checks right at the specified mileage (anything within a few K or so is fine) - just wait until the snow files or you have the bike down for other things. My FJR went from 22K to 29K miles this riding season with a specified check at 26K - I'll do the check this winter when I go through a major maintenance cycle. If it takes a week to get shims, no big deal.

Still like to see a DIY of the HP2S valve adjustment.

- Mark

[NakedRider]

Originally Posted by markjenn

While not recommended by the mfgs, some folks I respect say you can hand-grind the shims yourself and take off a few .01 mm and keep them essentially flat. I don't do it, but many do.

Are you talking about these BMW shims? I don't have the CD anymore but from what I remember the shims for this bike were almost shaped like a half-circle. I don't see how they would fit back into place if they were ground down.

I've seen shims in other bikes that were shaped more like a coin but these are different.

[shreddr]

why speculate, here you go:



No Part Number Description Qty Each
01 11347714768 intake valve BUY 4 $56.56
02 11347714769 exhaust valve BUY 4 $95.14
03 11317710485 repair kit valve seal ring BUY 1 $77.18
04 11347689920 valve spring BUY 8 $10.47
05 11341340846 valve collet (D=5) BUY 8 $1.34
06 11347676515 semi-sphere (4.60) BUY 8 $5.79
06 11347676516 semi-sphere (4.65) BUY 8 $5.79
06 11347676517 semi-sphere (4.70) BUY 8 $5.79
06 11347676518 semi-sphere (4.75) BUY 8 $5.79
06 11347676519 semi-sphere (4.80) BUY 8 $5.79
06 11347676520 semi-sphere (4.85) BUY 8 $5.79
06 11347676521 semi-sphere (4.90) BUY 8 $5.79
06 11347676522 semi-sphere (4.95) BUY 8 $5.79
06 11347676523 semi-sphere (5.00) BUY 8 $5.79
06 11347676524 semi-sphere (5.05) BUY 8 $5.79
06 11347676525 semi-sphere (5.10) BUY 8 $5.79
06 11347676526 semi-sphere (5.15) BUY 8 $5.79
06 11347676527 semi-sphere (5.20) BUY 8 $5.79
06 11347676528 semi-sphere (5.25) BUY 8 $5.79
06 11347676529 semi-sphere (5.30) BUY 8 $5.79
06 11347676530 semi-sphere (5.35) BUY 8 $5.79
06 11347676531 semi-sphere (5.40) BUY 8 $5.79
06 11347676532 semi-sphere (5.45) BUY 8 $5.79
06 11347676533 semi-sphere (5.50) BUY 8 $5.79
06 11347676534 semi-sphere (5.55) BUY 8 $5.79
06 11347676535 semi-sphere (5.60) BUY 8 $5.79
06 11347676536 semi-sphere (5.65) BUY 8 $5.79
06 11347676537 semi-sphere (5.70) BUY 8 $5.79
07 11337708465 left camshaft supporting bracket BUY 1 $247.31
07 11337708466 right camshaft supporting bracket BUY 1 $247.31
08 11337711887 drag lever BUY 8 $100.65
09 11127711064 rocker arm shaft BUY 8 $19.21
10 07119932872 circlip (9-PHR) BUY 8 $0.50
11 11347689913 spring pocket BUY 8 $2.98
12 11347689912 upper spring plate BUY 8 $3.62
13 11347689921 valve spring inner BUY 8 $7.59

there are 23 different shim thicknesses, and you need 8 of each, @ $5.79 apiece so that is about $1000

[turboflyer]

I found the honing method worked well. I did use a granite measuring block to keep things flat, but the shim is not much a surface to keep square so just about any thing will work. You most often need smaller shims any way. The ducati with opening and closing cams made things a bit fussy. That was on the two valve head, 4 in the same area would be a killer. With no valve springs things have to be pretty spot on. After the initial adjustment wear was very minimal. I think at the time shims were like 12 bucks a pop.

[JonM]

BMW Motorsport car engines adjust in a similar manner. BMW sells a shim kit assortment, but obviously none of us would need enough shims for 6 cylinders!

[Bob Hancock]

Oh that's purdy Jon. How much was it? Under uh billion dollars?

[Bigred455]

Originally Posted by JonM

BMW Motorsport car engines adjust in a similar manner. BMW sells a shim kit assortment, but obviously none of us would need enough shims for 6 cylinders!

These are NOT the same shims. These are cylinderical and will not work as the HP2 takes a half sphere shim as shown in Ralf's diagram item number 6.

[Deans BMW]

The shims used in the DOHC HP2S Boxer engine are the exact same shim used in the 800cc vertical twins and the K1200/1300 engines, they will also be the same shims used in the upcomming Boxer engined Beemers.

[shreddr]

Originally Posted by Bigred455

These are NOT the same shims. These are cylinderical and will not work as the HP2 takes a half sphere shim as shown in Ralf's diagram item number 6.

i've been insulted in this forum quite often, but being called Ralf is over the line!