Fireblade 954 compression problem - Honda Motorcycles - FireBlades.org
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post #1 of 117 Old 06-29-2016, 11:09 AM Thread Starter
 
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Fireblade 954 compression problem

I have had some power problems with the bike including other things which are in another thread, Any how i have just been handed the compression kit ive been waiting for to do the test.

Here's the numbers

cylinder 1 (170 psi )
cylinder 2 (160 psi )
cylinder 3 (30 psi ) WTF!
cylinder 4 (125 psi)

Looks like cylinder 3,s shot which explains the lack in power i have witnessed.

Does anybody have any advice for me please.
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post #2 of 117 Old 06-29-2016, 11:36 AM
 
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Re: Fireblade 954 compression problem

Pull the air cleaner pull the pipe. Blow in that extension hose and have someone hear out of #3 exhaust and you hear the intake side. Breather hose for the second ears or have someone blow into it and you walk the leaks.

Top end set - A given
Rings - A given
Valves - As needed or how many across the board?
Seat cuts - Send the head out to a head shop not a bike shop.
Shims - The deeper the cut, the thinner the shim or it breaks out are new seats installed.

Edit: Cylinder wall wear is why the rings and I'd keep it as cheap as possible or if it needs a bore job, then it's new pistons. Then, how loose are the small end rod bearings with a new wrist pin in it. See how it snowballs out of pocket?
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post #3 of 117 Old 06-29-2016, 1:23 PM Thread Starter
 
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Re: Fireblade 954 compression problem

Well here is where i am at now

Decided to drop a few ml of oil into cylinder 3 to see if that helped with compression, Then attempted to screw the compression tool inside and start tightening it down and low and behold the thing snaps on me leaving me with the 10mm adaptor minus the threaded section inside the cylinder thread,

After half my tools got thrown across the garage in anger i came up with a little device that fished it out in good shape. Tested the spark plug back in and out and seems that was a close shave to say the least.

You know them moments when everything just goes sour and ur best of just sitting there and riding the next 15 minutes out without touching a thing, WELL THAT WAS IT!

Here is the tool LOL.

https://postimg.org/image/omukb08z1/

Now left without a 10mm adaptor to go further into testing pfff. Will have to wait a few more days.
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post #4 of 117 Old 06-29-2016, 2:54 PM
 
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Re: Fireblade 954 compression problem

wow sounds like a proper nightmare!
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post #5 of 117 Old 06-29-2016, 2:57 PM Thread Starter
 
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Re: Fireblade 954 compression problem

It was touch and go for a while mate, Just glad i used some knowledge and fished it out.
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post #6 of 117 Old 06-29-2016, 2:59 PM Thread Starter
 
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Re: Fireblade 954 compression problem

Just had to order another adaptor so ill be waiting yet again a few days to carry on investigating the cause and a way to fix the problem. I suspect its probably a valve not seating properly rather than a poor ring seal.
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post #7 of 117 Old 06-29-2016, 3:00 PM
 
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Re: Fireblade 954 compression problem

You ok with that kind of work?
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post #8 of 117 Old 06-29-2016, 3:49 PM Thread Starter
 
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Re: Fireblade 954 compression problem

If i am being honest, Trying to figure out all the problems i am having and finding is a bit out of my comfort zone to say the least but at the end of the day i can at least say i gave it a go to find and fix the problem before i do admit defeat and have it sent of to a shop which i really have no funds for. I have the job of looking after my little boy who is 2 all day every day with no help from anybody financially. I was made redundant when the mrs gave birth and as she had a good job and liked it we agreed it would be best she stick to the job she enjoyed doing.

I like to give anything a tackle, Its just the tools i buy for the job that seem to be letting me down.
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post #9 of 117 Old 06-29-2016, 3:57 PM Thread Starter
 
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Re: Fireblade 954 compression problem

Quote:
Originally Posted by Catch22 View Post
Pull the air cleaner pull the pipe. Blow in that extension hose and have someone hear out of #3 exhaust and you hear the intake side. Breather hose for the second ears or have someone blow into it and you walk the leaks.

Top end set - A given
Rings - A given
Valves - As needed or how many across the board?
Seat cuts - Send the head out to a head shop not a bike shop.
Shims - The deeper the cut, the thinner the shim or it breaks out are new seats installed.

Edit: Cylinder wall wear is why the rings and I'd keep it as cheap as possible or if it needs a bore job, then it's new pistons. Then, how loose are the small end rod bearings with a new wrist pin in it. See how it snowballs out of pocket?
Sorry buddy to act dumb but could you be more specific on actual places to look and test. The full air cleaner housing is off the bike completely leaving just the throttle bodies there. all pipes are disconnected from the filter
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post #10 of 117 Old 06-29-2016, 4:52 PM
 
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Re: Fireblade 954 compression problem

Did you check valve clearences before the comp. test. I'd doubt the valves would be so tight that they would be little open all the time but there is always a tiny possebility...
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post #11 of 117 Old 06-29-2016, 5:00 PM Thread Starter
 
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Re: Fireblade 954 compression problem

No i have not checked the valves at all as i wanted to do the compression test first to have some idea, I was going to do the leak down test afterwards but still have not received the kit yet.

Compression test done today and those were the figures i witnessed.
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post #12 of 117 Old 06-29-2016, 7:25 PM
 
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Re: Fireblade 954 compression problem

I'd gut and spark plug, solder a copper tube down into the body of the plug. I have the copper tube cut high enough to clear plug entry. I place a plastic hose over the copper tube and blow in it. The hose is so long I can walk to the back of the bike for the muffler. Or hose long enough to go to the front of the head.

A. Intake valve: With throttle body off, blowing into the clear tube, I can hear air coming out of the intake port.
B. Exhaust valve: With muffler off, this port will send air out I can hear.
C. Rings: The fattest hose off the air box is the crankcase breather tube. I can hear air come up this tube off the engine.
D. Head gasket: Sometimes ticks out the front or back would be X. My Y axis would now be from cylinder to cylinder is a burnt ring gasket. Sometimes burns to the next cylinder over and both lose compression... as one is on compression, but the other cylinder is on its intake or exhaust [open] stroke and which side it burned on meaning.

Pampers is the priority not the parts:
New rings.
New valve.
Shim(s).
Can of copper coat for the used head gasket.
Reuse top rubber gasket and hope it seals.
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post #13 of 117 Old 06-30-2016, 2:04 AM
 
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Re: Fireblade 954 compression problem

Do a clearance check as a priority, v small hope, but you never know.
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post #14 of 117 Old 06-30-2016, 7:04 AM Thread Starter
 
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Re: Fireblade 954 compression problem

Ok this is the update, i have just spoke with honda workshop who have told me i could give it to them but it could cost £1000,s to fix. I mentioned the possiblility of a valve leak and he said not likely he suspects worse but will not know for sure.

I really don,t feel happy going that route and being charged a random number especially when he said thousands.

I am well out of my comfort zone here but i have no choice but to jump in the deep end and try my hardest with the help from you guys.

Is it worth doing the leak down test first before i pull off the valve cover,
Assuming i need to remove the coolant before taking that off.
I have got no other choice but to try .
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post #15 of 117 Old 06-30-2016, 7:27 AM
 
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Re: Fireblade 954 compression problem

Just pull the valve cover of. You don't have to drain any coolant for removing it. And then first check valve clearences....
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