cowthulhu
New Member
Posts: 36
Likes: 29
Registered: Nov 7, 2021 18:04:24 GMT -7
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Post by cowthulhu on Oct 4, 2024 19:07:37 GMT -7
I had the bike flashed and tuned earlier this year and just got my valve clearance service. I have way more pops and bangs than before, I actually couldn't remember if there were any at all. What could be causing this? I also had them swap the spark plugs and air filter.
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travis
Junior Member
Posts: 85
Likes: 70
Registered: Jun 29, 2018 17:45:10 GMT -7
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Post by travis on Oct 4, 2024 19:49:39 GMT -7
Will these bikes run with a cam off a tooth of timing?
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Post by RedAndBlack on Oct 4, 2024 20:37:54 GMT -7
Bangs if backfire could mean the air to fuel mixture is off and preignition is happening. This could be bad as it will cause damage. Pops are usually associated with excess fuel burning off in the exhaust during deacceleration. I wouldn't be too concerned with those, as adjusting tightened exhaust valves may have noticeable changes like this. But if you're having actual backfire, it may be cause for concern and it may be advisable to, at the very least, check the timing to make sure it's not off. That's what I think cowthulhu was hinting at. Sometimes a bike will still run with timing slightly off but will have issues. YouTube some videos on motorcycle backfire to get used to what you see/hear and then see if the bike is duplicating these symptoms and if the banging is actual backfire. If it is, I would start with the mechanic that did the service and have them take a look. Full disclosure, my mechanical expertise ends at valve service. I did help a mechanic friend so my valve service once but otherwise I leave that to the pros so my knowledge here is limited. I'm just relaying what I might do In This situation |
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cowthulhu
New Member
Posts: 36
Likes: 29
Registered: Nov 7, 2021 18:04:24 GMT -7
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Post by cowthulhu on Oct 5, 2024 7:26:31 GMT -7
Bangs if backfire could mean the air to fuel mixture is off and preignition is happening. This could be bad as it will cause damage. Pops are usually associated with excess fuel burning off in the exhaust during deacceleration. I wouldn't be too concerned with those, as adjusting tightened exhaust valves may have noticeable changes like this. But if you're having actual backfire, it may be cause for concern and it may be advisable to, at the very least, check the timing to make sure it's not off. That's what I think cowthulhu was hinting at. Sometimes a bike will still run with timing slightly off but will have issues. YouTube some videos on motorcycle backfire to get used to what you see/hear and then see if the bike is duplicating these symptoms and if the banging is actual backfire. If it is, I would start with the mechanic that did the service and have them take a look. Full disclosure, my mechanical expertise ends at valve service. I did help a mechanic friend so my valve service once but otherwise I leave that to the pros so my knowledge here is limited. I'm just relaying what I might do In This situation I never thought about that distinction between pops and bangs, for some reason I thought it was a catch all term. It is definitely just pops coming from the exhaust when I release the throttle quickly. I’ll take back to mechanic to see what he says. I’m hoping it isn’t caused by the spark plugs some how. |
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871jz
Full Member
Posts: 118
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Registered: May 1, 2024 6:51:14 GMT -7
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Post by 871jz on Oct 5, 2024 8:05:17 GMT -7
Was the AIS plugged prior to the service? Maybe it was unplugged or reconnected by the technician and you're getting the normal AIS pops and bangs on deceleration.
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Post by RedAndBlack on Oct 6, 2024 2:24:06 GMT -7
2nd on that. The pops on deaccel are normal and caused by the AIS system.
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