Rattle from cold start

5352 Views 10 Replies 5 Participants Last post by zerogara, Jul 18, 2011

Antyoung

Discussion Starter · Jan 12, 2010

Hi, I have two SP1s, one with Kerker cans and one 100% stock with 12000km on the clock.
The problem is the stock SP1 has a rattle that sound like its coming from the top end and is RPM related.It goes quiet after engine temp rises to 76 deg c but you can still just hear it.
I have been to the local Honda guy who also owns an SP1 and he thinks its fine but he has only heard it when the engine is hot.
I have checked the exhaust also and no leaks, all tight.
I have also fitted the Kerker cans to the newer bike and you can still hear the rattle.
Have changes the oil all to no avail.
My older SP1 with 30,000k on the clock sound so quiet compared to the newer one!
Also the new one makes a cracking noise when its been hot and is cooling down, just a sharp quick crack,almost a snap, sounds like the engine casings? its actually quiet loud?
So any ideas?
Cheers

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cbr lonner

· #2 · Jan 12, 2010 (Edited)

i had similar ticking cracking noise on a nissan 200 car

after much searching it was a tiny crack in the manifold.

it made a fair bit of noise and i thought it was a cam problem for ages.

as the engine got hot the noise disappeared as the crack tightened up with the heat.

it was welded and that was that.

not that i wont to worry you but there were some issues with the rear cams on a few of the early sp1's when raced or ridden very hard and was a overheating issue but this was quite rare.

this caused premature wear on the rear cams so think this wont apply to you.

all i can suggest bud.

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eepromking

· #3 · Jan 12, 2010

I have had this problem on an SP1 but rattle came from the front cylinder. i adjusted the valve clearence settings as there was too much clearance. Supposed to measure the clearence when it is warm to allow for expansion,but as you say ,when warm its ok , and also the clearences are as they should be. to eliminate the noise ,clearences were closed to minimum allowance. The cracking noises you hear are just expansion and contraction , they will lessen over time and use as bolts stretch etc over repeated expansion.

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Stu494

· #4 · Jan 12, 2010

Is there any chance you could expand on that, or have a link to a thread? I have a issue with a 'tick' on the rear cylinder, but it could be just me

Sorry if I am jacking the thread

cbr lonner said:
not that i wont to worry you but there were some issues with the rear cams on a few of the early sp1's when raced or ridden very hard and was a overheating issue but this was quite rare.

.

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cbr lonner

· #5 · Jan 12, 2010 (Edited)

Stu494 said:
Is there any chance you could expand on that, or have a link to a thread? I have a issue with a 'tick' on the rear cylinder, but it could be just me

Sorry if I am jacking the thread

hi sorry i dont have a link for it.

a few people mentioned it and it was the first lot of sp1's i believe.

it was one's that lived on track that had the prob and it was the rear cyl as that gets hotter.

by all means search some of the sp1-sp2 sites as you may get more info but it was not a problem with road bikes as far as im aware.

i had the sp2 so didn't take to much notice.

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cbr lonner

· #6 · Jan 12, 2010

eepromking said:
I have had this problem on an SP1 but rattle came from the front cylinder. i adjusted the valve clearence settings as there was too much clearance. Supposed to measure the clearence when it is warm to allow for expansion,but as you say ,when warm its ok , and also the clearences are as they should be. to eliminate the noise ,clearences were closed to minimum allowance. The cracking noises you hear are just expansion and contraction , they will lessen over time and use as bolts stretch etc over repeated expansion.

is that a typo:huh:

as far as im aware you check all valve clearances when the engine is cold.

ive never heard of checking when warm as an engine is designed to expand with heat and that is why its done when cold to allow for this :thumb:

that's why you generally drop the bike car off the night before for valve check
hth

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eepromking

· #7 · Jan 12, 2010

typing error and brain out of gear due to anasetic 4 days ago meant to say when cold.:crying: thanks , someone is awake !!!

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Antyoung

Discussion Starter · #8 · Jan 12, 2010

eepromking said:
I have had this problem on an SP1 but rattle came from the front cylinder. i adjusted the valve clearence settings as there was too much clearance. Supposed to measure the clearence when it is warm to allow for expansion,but as you say ,when warm its ok , and also the clearences are as they should be. to eliminate the noise ,clearences were closed to minimum allowance. The cracking noises you hear are just expansion and contraction , they will lessen over time and use as bolts stretch etc over repeated expansion.

Thanks for that info, I hope its as simple as that, the bike has 12000km or 7500miles on the clock so you wouldnt expect that to be the case but I will start there.
Cheers

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Antyoung

Discussion Starter · #9 · Jan 12, 2010

eepromking said:
I have had this problem on an SP1 but rattle came from the front cylinder. i adjusted the valve clearence settings as there was too much clearance. Supposed to measure the clearence when it is warm to allow for expansion,but as you say ,when warm its ok , and also the clearences are as they should be. to eliminate the noise ,clearences were closed to minimum allowance. The cracking noises you hear are just expansion and contraction , they will lessen over time and use as bolts stretch etc over repeated expansion.

Thanks! Good place to start, how many ks or miles had your bike done when this was going on?

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Antyoung

Discussion Starter · #10 · Jan 12, 2010

Stu494 said:
Is there any chance you could expand on that, or have a link to a thread? I have a issue with a 'tick' on the rear cylinder, but it could be just me

Sorry if I am jacking the thread

Hi Stu,
My older SP1 is actually a 2000 SPY #8 off the production line, I have used it as a race bike and it's had a hard time on the road too, had the shims checked at 25000k was all o.k. so yours will be fine too all going well.:thumb:

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zerogara

· #11 · Jul 18, 2011

When valves wear out on their seat gaps become smaller. Tight valves don't make noise, loose valves do as the lobe smacks on the surface and return too abruptly.
Now if the lobe was to wear out the clearance on the surface away from the lobe still doesn't wear out.
So what makes a larger gap?
Build up of carbon on the seats or the tappet/bucket wearing out.

I found this old thread while looking at a new post by someone doing a valve check on 22k mi and found them all OK. We know we have a good bike when we hear stories like this. I'd like to go to an R6 forum and see what those guys find on their 20 tiny Ti valves.

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