Rhinos bacfiring - Yamaha Rhino Forums - Yamaha UTV Forum
Member Introductions We are happy to have you with us, please take a moment to introduce yourself to the rest of the members.

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 09-03-2009, 02:51 PM Thread Starter
1/4 Throttle
 
Join Date: Sep 2009
Posts: 11
Angry Rhinos bacfiring

MY 2007YXR660 is running great as long as you are on the pedal but, when you let off and get back on it you hear a backfire. Also if you are running a little past idle tou can hear it cough ever so often. What is up with this?
yamadog is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 09-03-2009, 05:03 PM
RhinoTalk.net Site Sponsor
 
max powers's Avatar
 
Join Date: Jun 2008
Posts: 2,988
check all boots around carb for breaks or leaks, check exhaust for leaks, change your fuel filter.

VictoryGardenshydro.com
WeedConnect.net,get connected
max powers is offline  
post #3 of 8 (permalink) Old 09-03-2009, 06:01 PM
Wide F'n Open
 
Join Date: Aug 2009
Posts: 158
Had this issue with my Grizzly 450, problem was caused on mine due to the idle being set incorrectly. Too high or low of an idle causes too much back pressure when decelerating and will cause the machine to backfire.
wildbill23c is offline  
 
post #4 of 8 (permalink) Old 09-04-2009, 01:24 PM Thread Starter
1/4 Throttle
 
Join Date: Sep 2009
Posts: 11
the boots are good. my son and I just replaced the head gasket He set the timing at the center mark. Why are there three marks there and, which mark should he have set it at?
yamadog is offline  
post #5 of 8 (permalink) Old 09-04-2009, 01:40 PM
Wide F'n Open
 
Join Date: Aug 2009
Posts: 158
Center mark is top dead center which is the one you want for proper timing. The other 2 marks are for advanced timing and retarded timing. Don't know what they do but I know stock they don't run very well when the timing isn't set right.
wildbill23c is offline  
post #6 of 8 (permalink) Old 09-04-2009, 01:46 PM
3/4 Throttle
 
michaeltom401's Avatar
 
Join Date: Jul 2009
Posts: 70
hello

My Rhino always backfires when de-accelerating. Jason and another builder said that the low speed idle is set lean but was set that way to help with throttle response. My a/r meter always reads lean when I let off the gas and is not a problem.
michaeltom401 is offline  
post #7 of 8 (permalink) Old 09-04-2009, 02:43 PM
Wide F'n Open
 
Join Date: Aug 2009
Posts: 158
That sounds normal, but I know my Grizzly idle speed was set too low at one point and would backfire really bad, after it was adjusted properly it now isn't bad at all. Also if the idle speed is set too high the engine braking effect is lost.
wildbill23c is offline  
post #8 of 8 (permalink) Old 09-11-2009, 12:45 AM
Founding Ninja
 
Join Date: Jun 2008
Location: Ramona, CA
Posts: 379
Quote:
Originally Posted by yamadog View Post
the boots are good. my son and I just replaced the head gasket He set the timing at the center mark. Why are there three marks there and, which mark should he have set it at?
The other reply to this question is incorrect, please disregard it.

There are 3 lines on the flywheel. Two of them also have a radial line in between that connects them. This is the firing range. When the engine is running, if checking with a timing light, the mark on the case should be somewhere between these two marks.

The line by itself, which is the last line when spinning the engine in it's normal direction of rotation, is the mark for TDC, or top dead center. This is the mark that should be used when installing the cam chain and sprocket on the cam.

Regarding the backfiring.
Either an exhaust leak or a lean air/fuel ratio are the most likely cause, or a combination of both.
Like mentioned earlier, the "lean decel pop" can be tuned out, but sometimes at a tradeoff to throttle response and idle quality. I like to run them on the safe side of lean, if they decel pop, so be it.

Benchmark Performance
760-484-0986
s2k1 is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha Rhino Forums - Yamaha UTV Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58