Rhino backfires - Yamaha Rhino Forum - Rhino Forums.net
Engine For discussion of engine performance, and maintenance

 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old 03-18-2007, 06:29 PM Thread Starter
Mountaineer
 
Join Date: Mar 2007
Posts: 255
Rhino backfires

I have a 2007 660 Rhino. I put an aftermarket billet exhaust tip on the exhaust. The only difference between stock and the billet tip is increase from approx. 1” to 1.5” opening, and the billet tip is straight.

Ever since changing the exhaust tip, the Rhino backfires when I let off the gas.

The motor and carburetion is bone stock. I have a BRP CDI but I had that with no issue before the tip change.

Can anyone provide info on what the issue might be?

Thanks a million!!!

Rob
Rob4092xx is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old 03-18-2007, 08:33 PM
Premium Member
 
mikef's Avatar
 
Join Date: Feb 2007
Location: Beaumont, Ca. (Inland Empire)
Posts: 3,006
Quote:
Originally Posted by Rob4092xx View Post
I have a 2007 660 Rhino. I put an aftermarket billet exhaust tip on the exhaust. The only difference between stock and the billet tip is increase from approx. 1” to 1.5” opening, and the billet tip is straight.

Ever since changing the exhaust tip, the Rhino backfires when I let off the gas.

The motor and carburetion is bone stock. I have a BRP CDI but I had that with no issue before the tip change.

Can anyone provide info on what the issue might be?

Thanks a million!!!

Rob
I believe the exhaust tip requires rejetting .....

2006 Rhino 660
BRP Stage 2 CDI - UTVCrap Sheave
ITP T-7C Wheels (5+2 front offset & 2+5 Rear)
Big Horn Tires (25x8x12 & 25x10x12)
LSR MTS +3 Mid Travel Kit
Bilstein Shocks-250lb front & 400lb rear
mikef is offline  
post #3 of 15 (permalink) Old 03-18-2007, 08:40 PM
Life serves the risk taker
 
Chandler's Avatar
 
Join Date: Jan 2007
Location: Chandler, AZ
Posts: 4,198
tweeking your a/f is the solution I believe. It helped me and I've read it several sites that talk about jetting.
Chandler is offline  
Sponsored Links
Advertisement
 
post #4 of 15 (permalink) Old 03-18-2007, 08:44 PM
Lightning
 
alex053's Avatar
 
Join Date: Feb 2007
Location: North Peoria
Posts: 798
mine backfired for the first time yesterday and i didnt change a thing.

2006 Green 660
:: Dynatek CDI:: HCR Leg Minders:: Crow 4pt Harnesses:: Digital Dash:: UNI CVT and Air Filter:: CRB Rear Diff Support:: 12" Douglas Spiders with OMF Beadlocks:: Dynajet Kit:: Racer Offroad Custom 2 Seat Cage :: Jagged Extreme Billet Steering Wheel:: UTV Powersports Sheave::Pre-Runner Bumper::Cobra gear shift knob

alex053 is offline  
post #5 of 15 (permalink) Old 03-18-2007, 08:44 PM
Premium Member
 
mikef's Avatar
 
Join Date: Feb 2007
Location: Beaumont, Ca. (Inland Empire)
Posts: 3,006
I know nothing about jetting only what I have read .... so I agreee with Chandler...

2006 Rhino 660
BRP Stage 2 CDI - UTVCrap Sheave
ITP T-7C Wheels (5+2 front offset & 2+5 Rear)
Big Horn Tires (25x8x12 & 25x10x12)
LSR MTS +3 Mid Travel Kit
Bilstein Shocks-250lb front & 400lb rear
mikef is offline  
post #6 of 15 (permalink) Old 03-18-2007, 08:47 PM
Ninja
 
fergie80's Avatar
 
Join Date: Jan 2007
Location: Peoria, AZ
Posts: 1,959
Fuel filter might be dirty?

'05 660 : Fabtech Long Travel : BRP CDI : RAIS : Billet Intake w/ Uni Air Filter : Billet Tip : KMS Sheave w/Duners Clutch Kit : KMS Syphon Break : Uni CVT Filter : ITP 12" Rims w/ 25" 489's : Desert Toyz Cage : Renegade Seats : Custom Stereo : Alarm w/ Remote Start : Billet Goodies!

fergie80 is offline  
post #7 of 15 (permalink) Old 03-18-2007, 08:53 PM
Intrepid
 
Mr. Off-Road's Avatar
 
Join Date: Jan 2007
Location: Surprise, Arizona
Posts: 4,106
Send a message via AIM to Mr. Off-Road Send a message via MSN to Mr. Off-Road Send a message via Yahoo to Mr. Off-Road
Mine used to do that... with the same mods...

I took it to KMS and they re-jetted the carb, problem solved.
Mr. Off-Road is offline  
post #8 of 15 (permalink) Old 03-19-2007, 09:02 AM
Premium Member
 
mikef's Avatar
 
Join Date: Feb 2007
Location: Beaumont, Ca. (Inland Empire)
Posts: 3,006
Quote:
Originally Posted by alex053 View Post
mine backfired for the first time yesterday and i didnt change a thing.
That could be from running a low octane fuel .... Mine backfires with anything less than 91 octane ....

Also if you run it at high speed for an extended period of time and then let off of the throttle it may backfire ....

2006 Rhino 660
BRP Stage 2 CDI - UTVCrap Sheave
ITP T-7C Wheels (5+2 front offset & 2+5 Rear)
Big Horn Tires (25x8x12 & 25x10x12)
LSR MTS +3 Mid Travel Kit
Bilstein Shocks-250lb front & 400lb rear
mikef is offline  
post #9 of 15 (permalink) Old 03-21-2007, 03:25 AM
Supernova
 
AzBdBy's Avatar
 
Join Date: Feb 2007
Location: Surprise, AZ
Posts: 2,500
Adjust your fuel mixture screw slightly richer and it should cure your problem. Mike, if you backfire with anything less then 91 octane you should probably do the same thing. 91 octane resist the backfire more than 87.

Dustin
Whiplash Racing
Pro Mod UTV #70
2008 Pro Mod and Overall UTV Champion
Snowflake 2007 & 2008 Overall Champion
Alba Racing 686, Alba dual exhaust, PDM clutch, LSR XTR
AzBdBy is offline  
post #10 of 15 (permalink) Old 03-23-2007, 03:20 PM Thread Starter
Mountaineer
 
Join Date: Mar 2007
Posts: 255
Where is the fuel screw and how do I get to it?

Which way do I turn it?

How many turns?

Thanks for everyone's help!

Rob
Rob4092xx is offline  
post #11 of 15 (permalink) Old 03-23-2007, 04:16 PM
Life serves the risk taker
 
Chandler's Avatar
 
Join Date: Jan 2007
Location: Chandler, AZ
Posts: 4,198
The fuel mixture screw. I called it the A/F screw in this picture. 2 turns out is normally good.

You need to put a small drill into the brass plug and either insert a screw and pull it out. Mine came out while I was drilling it.

Turn the screw in until bottomed and then 2 turns out.

Chandler is offline  
post #12 of 15 (permalink) Old 03-23-2007, 06:06 PM Thread Starter
Mountaineer
 
Join Date: Mar 2007
Posts: 255
Chandler:

Wow...thanks a million for taking the time to post the photo and instructions for me! Please help me with the following if you don't mind!

It looks like I have to remove the carb to gain access to the A/F screw?

I thought 2 turns out was the way it is set up at the factory?

Turning it out makes it richer or leaner?

I ride my Rhino (BRP CDI) in Rocky Point. What jets should I have in it or are the stockers okay?

What jet is located to the right of the main jet in your photo?

Should I put a breather filter on the trans vent while I am at it? Where is it located and where do I get one?

Thanks again!

Rob
Rob4092xx is offline  
post #13 of 15 (permalink) Old 03-23-2007, 06:36 PM
Site Founder
 
Brian B's Avatar
 
Join Date: Oct 2006
Location: Chandler, AZ
Posts: 7,903
I had your setup, and I KNOW that my Rhino was backfiring because of an exhaust leak. Check your header nuts, as well as the union at the muffler pipe. You should be able to feel for a leak with the Rhino running.

Good luck!

ISA #1911
Brian B is offline  
post #14 of 15 (permalink) Old 03-23-2007, 07:06 PM
Life serves the risk taker
 
Chandler's Avatar
 
Join Date: Jan 2007
Location: Chandler, AZ
Posts: 4,198
Quote:
Originally Posted by Rob4092xx View Post
Chandler:

Wow...thanks a million for taking the time to post the photo and instructions for me! Please help me with the following if you don't mind!

It looks like I have to remove the carb to gain access to the A/F screw?
Yes and flip it upside down. I loosen both end clamps of the carb and the clamp for the boot connecting to the airbox. I can twist mine around without removing anything except the big vacuum line that plugs for the needle jet diaghram.

Quote:
Originally Posted by Rob4092xx View Post
I thought 2 turns out was the way it is set up at the factory?
Don't know. Mine did the same and when I adjusted, it was screwed all the way in.

Quote:
Originally Posted by Rob4092xx View Post
Turning it out makes it richer or leaner?
Richer

Quote:
Originally Posted by Rob4092xx View Post
I ride my Rhino (BRP CDI) in Rocky Point. What jets should I have in it or are the stockers okay?
Same as Phoenix. You shouldn't be much different just with the tip but before you remove the carb, do a high speed run, full throttle and immediately shut it down and check the plug. The CDI also let's it rev higher which may require a richer main.

Quote:
Originally Posted by Rob4092xx View Post
What jet is located to the right of the main jet in your photo?
I think it's called the power jet but no one ever does anything with it.

Quote:
Originally Posted by Rob4092xx View Post
Should I put a breather filter on the trans vent while I am at it? Where is it located and where do I get one?
I think your talking about the CVT filter and yes, it's a good idea. The outlet is right behind the driver seat. Check rhinocrap.com and see if they carry them or call them.



Make sure you don't drill too deep when removing the plug. You just want to get a screw in for a handle to remove the plug.
Chandler is offline  
post #15 of 15 (permalink) Old 03-30-2008, 10:44 PM
Puddle Jumper
 
SPM272's Avatar
 
Join Date: Mar 2008
Location: Santa Clarita, California
Posts: 184
Dumb question, but when you guys say to adjust the air fuel mixture screw out 2 turns, what is considered a turn? Is it done in 1/4, 1/2 or a full turn to equal 1 turn.

I was having stalling issues with my rhino like it was running out of gas. I switched to a high flow fuel pump, I swapped the needle washers to get it to run richer, and put on a tri fire cdi. Now I am getting loud back fires if I run it full throttle and let off the gas.

Thinking the air/fuel screw is my next adjustment. Am I going the wrong direction in trying to fix it, or is that sound like it could help?
SPM272 is offline  
Reply

  Lower Navigation
Go Back   Yamaha Rhino Forum - Rhino Forums.net > Technical > Engine

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Yamaha Rhino Forum - Rhino Forums.net 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









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



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