Author Topic: Valve clearance question  (Read 3912 times)

Offline Motorhobo

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Valve clearance question
« on: April 09, 2014, 06:02:54 PM »
Using the leftover shims from the adjustment on my 95 K75 last summer, I was able to get the 94 close to optimal -- but not quite.

Intake 2 and 3 are at .152 - .178 mm, Exhaust 1 is at .279 - .303 -- that's pretty much where it should be from what I read.

But closest I could get on Intake 1 with my existing shim collection was .203 - .229. The .203 gauge was very tight but I could still get it in there. So I'd peg it at less than .210.

Exhaust 2 and 3 are at .303 - .330. The .303 gauge was tight but I could still get it in there, so I'd peg it at less than .310.

The bike has 74k miles and had the original shims -- measured about .1/.1/.16 on the intake side and .23/.23/.22 on the exhaust.

So the question is, is the bike going to kick my ass for being .01mm on the north side of spec? Or will the valves wear that .01 off gracefully over time? I'm going to Bob's this weekend and I'm not too upset about dropping the $18 for 3 new shims but I don't want to make extra work for myself unless that extra .01 is going to get me some bad mojo with my brick.

Van
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

Offline TimTyler

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Re: Valve clearance question
« Reply #1 on: April 09, 2014, 10:17:06 PM »
You want the intake to be 0.15-0.20 mm and CLOSER TO .15 mm

You want the exhaust to be 0.25-0.30 mm and CLOSER TO .30 mm

I would make an effort to match the spacing across all three cylinders. I brought my old shims to the dealer and they swapped them out with the proper sized replacements at no charge.

Offline johnny

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Re: Valve clearance question
« Reply #2 on: April 09, 2014, 10:32:39 PM »
loose valves save lives...

j o
  • :johnny i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin  :johnny

Offline Motorhobo

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Re: Valve clearance question
« Reply #3 on: April 10, 2014, 06:06:03 AM »
You want the intake to be 0.15-0.20 mm and CLOSER TO .15 mm

You want the exhaust to be 0.25-0.30 mm and CLOSER TO .30 mm


That's what I'd read, but was kind of hoping the consensus here would be that there's a little more wiggle room than that.

I will get the shims.

loose valves save lives...

Does that apply to wheel lugs too? I think I'll try that!   :falldown:

Van
1994/1995 K75 ABS Frankenbike: original engine 136k miles, frame from Gary Weaver (RIP), 173k miles -- Current Odometer: 198k miles
1994 K75 since 2013, 82,000 mi (19k mine) w/California Sidecar Friendship II Sidecar & Black Lab 'Miss B' - RIP

Past: 1974 Honda 550/4 (first bike), 1994 K75 (sold), 1995 K75 ABS (parts bike), Sidecar Dog & Best Bud 'Bo' - RIP

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