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Old 08-26-2013, 12:37 AM   #21
Aurimas
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Unhappy Re: Engine problem: I think it will be the 3rd time...

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Originally Posted by Iowa599 View Post
Can you push the valves out and get a picture that shows the seats & margins? Might have to reinstall the cam to do it.

I don't see any signs that the valves were hitting.
I don't have special tools for removing valves. But later I'll post some pictures when valves will be removed.

There is a big possibility that it will be necessary to replace all intake valves. Because after one adjustment there is no coming back. The valves will go deeper into the valve seats.
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Old 08-26-2013, 05:59 AM   #22
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Default Re: Engine problem: I think it will be the 3rd time...

I don't mean remove them, just get them pushed down into the open position. If you install the buckets & cam some of the valves should get pushed down by the cam.

Then you can get a picture that will show the sealing area & the edge of the valve.
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Old 08-31-2013, 01:20 PM   #23
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Angry Re: Engine problem: I think it will be the 3rd time...

And here we go

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Old 08-31-2013, 03:23 PM   #24
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Default Re: Engine problem: I think it will be the 3rd time...

The valve is bad, it looks like the seat survived.

Well, if it had a valve job done sometime in the past I would guess that it were ground too far, but you said it had not, so I'm going to venture a guess here.

I would guess that it was adjusted just slightly too tight during the first adjustment, it overheated and 'burned' out the heat treating. Since then, every time the valve slapped closed it has deformed, further tightening the gap and giving you that knife edge. If the valve were defective from the factory, I don't think it would have lasted as long as it did.

On the plus side, you should be able to get away with just a few new valves and a gasket set.

Wow, those valves are almost $30 each...
http://www.bikebandit.com/houseofmot...1094#sch412680

Might be able to find them aftermarket or used. If you compare part numbers on that site, you can check for cross references, CBR parts may work and should be easier to find.
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Old 08-31-2013, 03:28 PM   #25
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Default Re: Engine problem: I think it will be the 3rd time...

buy used low mileage cbr head. install, ride. you might want to start adding a small bit of lead to your fuel, for whatever reason your intakes took a hell of a beating, honda's dont usually do this.
Double check with someone before adding lead, but i think since we're carbed it should be okay.
Or... take head to trusted machine shop, port and polish intake and exhaust runners, mill head a few thousands, make powa. smoke cbr's.
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Old 08-31-2013, 07:07 PM   #26
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Default Re: Engine problem: I think it will be the 3rd time...

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buy used low mileage cbr head. install, ride. you might want to start adding a small bit of lead to your fuel, for whatever reason your intakes took a hell of a beating, honda's dont usually do this.
Double check with someone before adding lead, but i think since we're carbed it should be okay.
Or... take head to trusted machine shop, port and polish intake and exhaust runners, mill head a few thousands, make powa. smoke cbr's.
It's not about the injectors or carbs, it's about the catalytic converter & O2 sensor. Also, causes some serious side effects (check the studies on crack babies that were linked to crime, turns out it wasn't the crack, it was leaded gas exhaust fumes).

The valves should be fine without leaded gas, anyway.

Unfortunately, I would really have to consider this one as a mechanic caused failure.
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03 CB900F 919 -the wife's (CBR wheels, CBR forks, rear flush mounts, dirty bars, yosh exh)
83 CB550/650 Nighthawk -the beast
81 GL1100 Goldwing -sorta cafe
75 CB360 -real cafe

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Old 09-01-2013, 03:34 AM   #27
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Default Re: Engine problem: I think it will be the 3rd time...

The strange side is that in all cylinders one valve is deeper than the other one: First one is less the second, third less than fourth and so on...

I'm going to replace all valves ant shims (how to correctly select ones?), valve seat? Replace them or leave old ones? I didn't notice any oil leakage.

If get back to valve adjustment, it was done correctly measuring the shims couple of times. All were in specs 0.16mm +-0.03...

Maybe someone knows the aftermarket valve manufacturer?
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Old 09-01-2013, 05:24 AM   #28
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Default Re: Engine problem: I think it will be the 3rd time...

for the new shims, you just gotta put it together with some old shims, measure, and then select new ones, just like a valve adjustment.

It is true that you will get more performance by having it closer to the tight end of the spec, but it's safer to run on the loose end of the spec.

The seats look fine. Stem seals will probably be fine, but they're cheap.
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06 CB600F6 599 (b) -LED tail, undertail, dirty bars, bar-end mirrors, shorty levers, tag/seat hack
03 CB900F 919 -the wife's (CBR wheels, CBR forks, rear flush mounts, dirty bars, yosh exh)
83 CB550/650 Nighthawk -the beast
81 GL1100 Goldwing -sorta cafe
75 CB360 -real cafe

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Old 09-01-2013, 05:51 AM   #29
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Default Re: Engine problem: I think it will be the 3rd time...

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for the new shims, you just gotta put it together with some old shims, measure, and then select new ones, just like a valve adjustment.

It is true that you will get more performance by having it closer to the tight end of the spec, but it's safer to run on the loose end of the spec.

The seats look fine. Stem seals will probably be fine, but they're cheap.

But anyway, we did not find why the valves are worn out at ~21000km...

One man said that after the first valve adjustment, they continue to wear even faster...
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Old 09-06-2013, 03:31 AM   #30
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Default Re: Engine problem: I think it will be the 3rd time...

Yesterday (Europe time) I ordered new 8 intake valves and head gasket.

Cylinder head is at workshop, to measure the head surface, check/repair valve seat angles if it is necessary...
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Old 09-11-2013, 09:32 AM   #31
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Default Re: Engine problem: I think it will be the 3rd time...

Today arrived new valves ant head gasket...


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Old 09-12-2013, 08:25 AM   #32
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Default Re: Engine problem: I think it will be the 3rd time...

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It's not about the injectors or carbs, it's about the catalytic converter & O2 sensor. Also, causes some serious side effects (check the studies on crack babies that were linked to crime, turns out it wasn't the crack, it was leaded gas exhaust fumes).

The valves should be fine without leaded gas, anyway.

Unfortunately, I would really have to consider this one as a mechanic caused failure.
carb'd bikes dont have cat's or 02 sensors. If they do, they can be eliminated. Bikes don't use 02 sensors in the same manor as cars. In a car it's used to constantly make adjustment to the afr to keep it as close to 14.7 as possible in all ranges of throttle and load, in bikes it's used to keep emissions low under the best of circumstances. The ecu's are much less dependent on them than car's are, if at all. On some systems they are only used to babysit the EGT's to keep the cats from melting down.
hence these
http://www.amazon.com/1998-2010-Hond.../dp/B009SP6B1K

cat's only serve to keep idle emissions low for the greeny bastards, They make everything run worse in my opinion. more heat, more restriction, lower engine life, more weight, with zero benifit on a machine that puts out less emissions than a prius on it's best day anyway.
Personally I don't own a vehicle with cats other than the new vfr and that will change soon. but im kind of an asshole when it comes to emissions. It's been proven time and time again that cattle, volcanic emissions and deep sea fissures do more damage to the ozone than all cars in world combined over a 100 year period. (i pulled those numbers directly out of my ass.)
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Old 09-12-2013, 08:25 AM   #33
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Default Re: Engine problem: I think it will be the 3rd time...

OH grats on the new vavles!
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Old 09-12-2013, 11:58 AM   #34
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Default Re: Engine problem: I think it will be the 3rd time...

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OH grats on the new vavles!
Got today new valves installed and head polished...

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Old 09-13-2013, 06:13 AM   #35
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Default Re: Engine problem: I think it will be the 3rd time...

This is turning into a porn thread.


Thanks for updates Aurimas. Much appreciated. You know Iowa had an accident, aye?
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Old 09-13-2013, 11:49 AM   #36
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Unhappy Re: Engine problem: I think it will be the 3rd time...

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This is turning into a porn thread.

Thanks for updates Aurimas. Much appreciated. You know Iowa had an accident, aye?
But I'm still very confused about my bikes' problem...



OMG! Is he all right? Nothing serious?
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Old 09-17-2013, 04:50 AM   #37
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Default Re: Engine problem: I think it will be the 3rd time...

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But I'm still very confused about my bikes' problem...

Me too.
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Old 09-17-2013, 05:12 AM   #38
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Default Re: Engine problem: I think it will be the 3rd time...

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OMG! Is he all right? Nothing serious?
it doesnt sound like it his wife posted earlier in another thread. sounds like he spilled pretty hard with no helmet
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