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post #1 of 17 Old 05-14-2019, 05:48 PM Thread Starter
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I need help

Hi I bought a 2010 arctic cat 550 h1 efi trv and when I start to slow down it makes this noise like it backfires a bit what could be the problem I'm new to owning an atv
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post #2 of 17 Old 05-14-2019, 06:01 PM
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Sled: 1997 t cat,1997 zrt 600
dirty carb?
if its not efi that is
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post #3 of 17 Old 05-14-2019, 07:02 PM Thread Starter
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What do you mean if it's not efi. My machine is a 550 h1 efi trv
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post #4 of 17 Old 05-14-2019, 09:03 PM
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Backfires, as in a loud bang, or does it sound as though popcorn is popping in smaller, lighter pops?

Who, me?! Don't listen to me.... (I don't know anything, evidently...)

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That is freeking sick man........
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0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...
https://www.arcticchat.com/forum/z-z...tml?highlight=

http://www.randakksblog.com/more-on-...fear-the-corn/

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post #5 of 17 Old 05-15-2019, 03:56 AM Thread Starter
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Yeah its smaller lighters pops
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post #6 of 17 Old 05-15-2019, 06:53 AM
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Lean condition causes this. Being it’s efi, it could be difficult for you to track down. Possibly just the mapping of the ecu?

Knowing how lean some Cats are from the factory, it wouldn’t surprise me if that were the issue (mapping). Maybe being assisted even further by a leaky intake boot, or maybe a leaky exhaust joint between headpipe and muffler (sucking in air)?

Who, me?! Don't listen to me.... (I don't know anything, evidently...)

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If it's cnote approved it will work good
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Originally Posted by DonoBBD View Post
That is freeking sick man........
Don
0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...
https://www.arcticchat.com/forum/z-z...tml?highlight=

http://www.randakksblog.com/more-on-...fear-the-corn/

"Arctic Chat is not affiliated with Arctic Cat Inc. in any way, shape or form. We are an enthusiast site run by fans."

(Are you experiencing issues with your local dealer? Feel free to call Cat Consumer Complaint @ 218-681-8558)
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post #7 of 17 Old 05-15-2019, 07:05 AM
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My 700 Cat will backfire once in a while when using engine braking. I've never found anything out of place or leaking, After putting a snorkel on, it seems a bit worse. I suspect the factory efi mapping is set a wee bit lean for "emissions". C-note hit it right on the head, I believe.

2014 700TRV XT EPS, 2008 700SD Intercooled Turbo

Last edited by Wallamatogus; 05-15-2019 at 07:09 AM.
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post #8 of 17 Old 05-15-2019, 11:02 AM
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What do you mean if it's not efi. My machine is a 550 h1 efi trv
sorry I had a brain fart there??

another thing I have seen is when folks run a lot of ethanol fuel and atv sits a lot, this happens to a lot of atv's (all brands) at my hunting camp, where 10-12 atv's site 5-7 months out of the yr
all the guys running ethanol , there atv's backfire often, guys that ONLY use ethanol or run atv often, don;t seem to have issue's
so, I also thing its a fuel issue
from either just the fuel running, or how ethanol fuel builds crap varnish like coatings on things over time

so, could be a fuel flow issue's too due to something being some what blocked up ,
maybe try running some sea foam or like treatment(not than magic in a can fixing all things)
but it might help some here if its mild issue and can clean/free things up for you?
before going deeper into things!
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post #9 of 17 Old 05-15-2019, 03:10 PM Thread Starter
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How can I fix that I really dont know what to do cause this is the first ATV I've owned so I take it to the garage
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post #10 of 17 Old 05-15-2019, 03:16 PM
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Quote:
Originally Posted by Wallamatogus View Post
My 700 Cat will backfire once in a while when using engine braking. I've never found anything out of place or leaking, After putting a snorkel on, it seems a bit worse. I suspect the factory efi mapping is set a wee bit lean for "emissions". C-note hit it right on the head, I believe.
Adding a snorkel (lengthening/restricting “ever so slightly”) the path of incoming air, should have made it less noticeable?

Who, me?! Don't listen to me.... (I don't know anything, evidently...)

Quote:
If it's cnote approved it will work good
Quote:
Originally Posted by DonoBBD View Post
That is freeking sick man........
Don
0637-185: '99 Sno-Pro APV (guide and button) update kit p/n...
0637-186: '99 Sno-Pro APV superseded valve inserts update kit p/n...
https://www.arcticchat.com/forum/z-z...tml?highlight=

http://www.randakksblog.com/more-on-...fear-the-corn/

"Arctic Chat is not affiliated with Arctic Cat Inc. in any way, shape or form. We are an enthusiast site run by fans."

(Are you experiencing issues with your local dealer? Feel free to call Cat Consumer Complaint @ 218-681-8558)
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