Chain rattling noise under load, XCT headed to the shop - Victory Forums - Victory Motorcycle Forum
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post #1 of 46 (permalink) Old 07-14-2015, 10:30 AM Thread Starter
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Default Chain rattling noise under load, XCT headed to the shop

Rattling noise from engine under acceleration or pulling a hill. Has gotten more pronounced over the last few rides.
MPG is down to 33. Bike is a '12 with cam job and 14k miles. I don't push it hard at all.
Wild a$$ guesses as to what's going on?

Edit: pic of plugs added page 3

Last edited by MMGUT; 07-14-2015 at 11:26 PM.
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post #2 of 46 (permalink) Old 07-14-2015, 11:03 AM
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I'm interested to hear what they tell you.

I feel like I have the exact same issue, but the bike runs like a champ so I have pretty much chalked it up to the idea that these big V-twin engines can't help but to have some noise.

Wearing my half helmet with no music, it really bugs me. With my 3/4 helmet and music I don't hear it so I feel better.

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post #3 of 46 (permalink) Old 07-14-2015, 11:07 AM
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rattling I think would refer to something loose.

I'm guessing you have a knock. Probably a piston

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post #4 of 46 (permalink) Old 07-14-2015, 11:46 AM
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Quote:
Originally Posted by visionjohnny View Post
rattling I think would refer to something loose.

I'm guessing you have a knock. Probably a piston
Way to jump to conclusions. You're joking right? A "loose piston" would be pronounced at an idle. MMGUT, i'm not sure what your mechanical expertise is but you are stating under load and going up a hill. This to me sounds like you're describing pinging. If you had something mechanically wrong you should be able to hear it while idling. If in fact you can hear it while idling, buy a stethoscope and try to find the noise. Please keep us updated. Also, is your bike tuned?

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post #5 of 46 (permalink) Old 07-14-2015, 11:56 AM
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post #6 of 46 (permalink) Old 07-14-2015, 11:57 AM
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Subscribed ... It could even be your PCV ... when i installed my PCV and NO autotune .. The bike under load did the same, pinging or ratling sound, then i downloaded different maps & autotune and it was gone

When i installed my cams myself then the bike did not run perfect until i opened the airvalve more and i got a map for cams

It just could be small changes to be made ??

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post #7 of 46 (permalink) Old 07-14-2015, 12:02 PM
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Sounds like little marbles in the top of the jug...only happens under load?

I'm not a mechanic. But I'm with OhioPatriot. That could be pinging. I've had it before when I run 87 octane, it's hot out, and I'm pulling hard uphill. And as the weather warms up, it might seem to get worse with each ride...because, doesn't pinging get worse as it temps increase?

33 mpg doesn't sound out of line to me if you've got cams and you're pulling hard uphill.

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post #8 of 46 (permalink) Old 07-14-2015, 12:31 PM
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Quote:
Originally Posted by skullsessions View Post
Sounds like little marbles in the top of the jug...only happens under load?

I'm not a mechanic. But I'm with OhioPatriot. That could be pinging. I've had it before when I run 87 octane, it's hot out, and I'm pulling hard uphill. And as the weather warms up, it might seem to get worse with each ride...because, doesn't pinging get worse as it temps increase?

33 mpg doesn't sound out of line to me if you've got cams and you're pulling hard uphill.
This could be it too. We don't have enough info to rule it out one way or the other.
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post #9 of 46 (permalink) Old 07-14-2015, 12:34 PM
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I certainly wouldn't argue it with you either way. My friends will attest to the fact that I'm NOT a mechanic.

I'm kidding. I don't really have any friends.

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post #10 of 46 (permalink) Old 07-14-2015, 12:35 PM Thread Starter
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Great responses so far.
Lets confuse things with some more info:

-bike runs very smoothly
- cams were installed before I bought the bike with a PCV included.
- I had the bike dyno tuned here in Utah 3k miles ago which eliminated a dead spot at 2k rpm
- I have been running 88 octane because I live at 4200' elevation and typically ride at 7000'+ because the interwebs said 91 octane isn't needed here
- Last tank I filled with 91 octane but the noise persists, only under load.


Thanks. With help here maybe I can skip the shop visit :-)
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