Help with engine noises.
Thread Starter
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Stellar HDF Member
Joined: Aug 2011
Posts: 3,158
Likes: 68
From: Martinsburg, WV
Help with engine noises.
I havea 95CI bike with SE203 cams.
Like a dumbass, I put 87 in it yesterday while I was thinking about something else and not paying attention. On the 112 mile ride home from VA to WV, I would get a sound that was louder on the left side of the bike than the right that sounded like someone hitting a thin piece of metal with a screw driver head while accelerating hard from low in the rev range.
What I did notice though, was that while at idle the kock noise went away. There was a knocking noise at idle that that almost sounded like someone drumming on a wood block. The indie said that was normal but obviously it isn't if it's completely eliminated by a lower octane gas.
The bike hasn't been dyon'ed yet and is waiting for heads. It has all SE upgrades for stage 1 and 2 and is running the map from the SE Race tuner for 8mm injectors, which should match everything on the bike perfectly.
The other issue I'm have is that at idle sometimes after it's started after still being hot and sitting, it'll idle much lower and make sucking noises while wanting to stall out. I'll have to get it moving again for it to idle right.
Any ideas what's wrong with the thing and why it's running like that if it has the appropriate canned map?
Like a dumbass, I put 87 in it yesterday while I was thinking about something else and not paying attention. On the 112 mile ride home from VA to WV, I would get a sound that was louder on the left side of the bike than the right that sounded like someone hitting a thin piece of metal with a screw driver head while accelerating hard from low in the rev range.
What I did notice though, was that while at idle the kock noise went away. There was a knocking noise at idle that that almost sounded like someone drumming on a wood block. The indie said that was normal but obviously it isn't if it's completely eliminated by a lower octane gas.
The bike hasn't been dyon'ed yet and is waiting for heads. It has all SE upgrades for stage 1 and 2 and is running the map from the SE Race tuner for 8mm injectors, which should match everything on the bike perfectly.
The other issue I'm have is that at idle sometimes after it's started after still being hot and sitting, it'll idle much lower and make sucking noises while wanting to stall out. I'll have to get it moving again for it to idle right.
Any ideas what's wrong with the thing and why it's running like that if it has the appropriate canned map?
Thread Starter
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Stellar HDF Member
Joined: Aug 2011
Posts: 3,158
Likes: 68
From: Martinsburg, WV
I figured that was probably the issue. What about the knock noise while using 93 and the shitty idle after sitting 30-minutes to an hour and being started with the sound like it's sucking too much air through the intake ever couple of seconds.
Ultimate HDF Member
Joined: Jan 2008
Posts: 7,476
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From: Republic of Texas
SERT should control idle. You might save a copy of your map your running now and then start tweaking the old map in the tuner. My SERT will actually tell me what is going on if I am smart enough to understand it when I hook it up to my computer. I don't understand running the lower octane gas at all. Air cooled, high compression, hot engine, hot ambient temp needs the higher octane gas. I always run something about 90 octane unless something lower is all I can get.
Thread Starter
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Stellar HDF Member
Joined: Aug 2011
Posts: 3,158
Likes: 68
From: Martinsburg, WV
SERT should control idle. You might save a copy of your map your running now and then start tweaking the old map in the tuner. My SERT will actually tell me what is going on if I am smart enough to understand it when I hook it up to my computer. I don't understand running the lower octane gas at all. Air cooled, high compression, hot engine, hot ambient temp needs the higher octane gas. I always run something about 90 octane unless something lower is all I can get.
It's set to idle at 1k.
Club Member
Joined: May 2007
Posts: 145,895
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From: 40 miles Northeast of Indy..
Why would U not get her dyno tuned if U have the SERT... just loading a map seems a total waste of time and money... just my .02$
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Ultimate HDF Member
Joined: Jan 2008
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From: Republic of Texas
The poor idle while hot sometimes would drive me nuts. If it was me I would try to get a snap shot of that on my computer when it happens with my sert. Sometimes I figure that crap out by looking at what it is and what it should be.
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Thread Starter
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Stellar HDF Member
Joined: Aug 2011
Posts: 3,158
Likes: 68
From: Martinsburg, WV
Do you have anything constructive to offer?
I've been reading and the knocking noise I get at idle could be piston slap. If my cyclinders don't sell I might get them bored to 97 to fit new pistons and put those on with the heads. Doesn't seem like a lot of money.
Outstanding HDF Member
Joined: Dec 2007
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From: In front of the computer for now.
Maybe if he knew the circumstances behind your bike he would have something constructive to say. Now, with a **** poor attitude, not likely.