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14.7 to 1
Started by wwlknsn at 10-11-2006 11:37 AM. Topic has 16 replies.
  
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 10-11-2006, 11:37 AM
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wwlknsn
Joined on 04-09-2006
Memphis, Tn
Posts 154
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Read this if you have never jetted your Rhino
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I have written this for those individuals that have requested information on how to change the jets on a Rhino. Most have been as a result of customer inquiries after buying my Roostin' Rhino RAIS Power Tube but the info is certainly applicable as a result of any intake/exhaust modification.
I highly recommend rejetting once the RAIS Power Tube is installed. A complete set of instructions will be included with your purchase, which includes jetting recommendations. For those that may be interested in buying a Roostin' Rhino RAIS Power Tube, my primary sales platform is eBay. You can go to www.eBay.com and search RAIS and my listing will come up. You can also contact me via PM here and I'll be glad t arrange for sale. I also have Mikuni 152.5, 155 and 157.5 main jets for $8.00 each. The RAIS Power Tube is $24.99.
As far as your initial attempt at rejetting, you'll need a 3 and a 4 mm allen wrench, a 10mm wrench, needle nose pliers, a flat screwdriver, a 3/32 drill bit and drill, a 3/32 sheet metal screw and a small set of vice grips to grab on to the float bowl screws as they are typically very tight from the factory and very easy to strip. I'd recommend replacing the phillips screws with the equivalent allen screw. I also have these allen screw replacements available for sale for $3.00 for 4.
Loosen the carb boots on each side of the carb and the boot attached to the air filter canister. Detach the rubber vacuum hose at the top of the carb and pivot aside. Pull the crankcase vent hose out of the slotted retainer. Lift the carb and canister boot out by pivoting at carb throat and canister boot and pivoting/lifting up. Once loose, stuff a rag in the intake and filter canister to keep debris out. Remove the 2 wires from the carb heater. Lay the carb over on its side toward the passenger side. All the fuel in the bowl will drain out unil empty. You do not have to loosen or remove the enricher cable or throttle cable. Remove the carb heater which is the fitting that the two wires attahced to. Try to loosen the phillips screws on the float bowl but be very careful as they will strip. If they don't break loose relatively easily, use the small vice grips to assist the screwdriver in getting them loose by gripping the outside surface of the screw. Once all 4 screws are removed, remove the bowl carefully. The main jet is the jet in the middle surrounded by the brass sleeve and kind of recessed into same. Change your jet and put in back together in same order as removal.
Initially, you'll need to remove the brass plug hiding the a/f mixture screw. Its probably 1 turn out from the factory. It needs to be out 1.5 to 2 turns. Its the brass plug closest to the front of the carb. Drill it with about a 3/32 bit just barely through the top because you don't want to damage the screw. Take a sheet metal screw and screw it in the hole and work the plug out which will expose the a/f screw. Screw the a/f screw softly until it seats and then out 2 turns.
You will also want to enhance your mid range performance as well. You'll need some needle nose pliers to pull the needle retaining plunger out. Remove the CV carb top by removing the 2 phillips screws on top of the carb. The slide is under spring pressure so remove slowly. Pull the slide and diaphragm out. Pull spring out and look inside. You can see the plunger holding the jet needle in place. It is also under spring pressure, albiet a small amount. It takes a pretty good tug the first time. Be sure not to lose the spring under neath. If you retain the stock jet needle, I would swap the thick and thin washers on either side of the jet needle circlip and put it back together. Before careful to properly place the slide and diaphragm back in place correctly and in proper position.
Based on your situation, you will likely want to get some combination of a 147.5, 150, 152.5, 155, 157.5 and 160 mikuni mains if you choose to simply rejet depending on your elevation. I would also pick up a 42.5 and a 45 pilot jet. In general and this is very general, I would recommend the following as a starting point on main jet selection given your typical elevation conditions. At 0'-1,500' > 155, 1,500 - 3,000 > 152.5, 3,000 - 4,500 > 150, 4,500 - 6,000 > 147.5, 6,000 - 7'500 > 145. You may need to go up or down a bit but this should be pretty close.
After all back together, crank it up and adjust idle speed if necessary. Let it warm up and take it out and assess the way that it transistions off idle and into mid range followed by top end. Jetting is the sum of all components, so you want to get your idle right first, then transition off idle, best mid range acceleration and finally best top end.
Once all of this is done initially, it takes about 15-20 minutes to do it again if needed or to correct any specific circuit problem recognized.
With the RAIS Power Tube and air filter, you'll notice a healthier responding motor across the powerband with absolutely no running problems once properly jetted. There is an increased amount of intake noise but that makes sense given the change in size of the opening. You can realize the same benefit by removing the o.e.m intake and running '04 style but you will be drawing air from under the engine cowling which may be quite dirty. One of my original goals with the RAIS was to retain the '05/'06/'07 intake design.
ww
Roostin' Rhino RAIS Power Tube
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10-25-2006, 8:04 PM
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OutCole'd
Joined on 09-21-2006
Posts 11
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Re: Read this if you have never jetted your Rhino
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WW, The PM's dont seem to work, but I'm intersted in some of these mods. Email me at Bill@smnv.net so we can do some business when you get a chance.
Thanks,
Bill
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10-26-2006, 9:04 PM
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OutCole'd
Joined on 09-21-2006
Posts 11
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Re: Read this if you have never jetted your Rhino
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 Outlaw Baird wrote: | |
William,
I got the RAIS and the jets in the mail today! Thanks partner. Now if I can just get the time to put it all in.........ITS GONNA BE ON LIKE DONKEY KONG!!!!!
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Just ordered mine today, let me know how yours goes.
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11-03-2006, 10:13 PM
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OutCole'd
Joined on 09-21-2006
Posts 11
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Re: Read this if you have never jetted your Rhino
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OK, stupid question. In the directions for adjusting the air/fuel mixture screw you say it's the plug closest to the front of the carb. What side do you consider the front? The side closest to the head or air cleaner? I just hate to drill the wrong plug.
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11-03-2006, 10:54 PM
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OutCole'd
Joined on 09-21-2006
Posts 11
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Re: Read this if you have never jetted your Rhino
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Nevermind, found an image on BRP.
Got the jetting done tonight and the RAIS tube installed. Too late to test tonight, but we will see how it goes tomorrow.
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11-04-2006, 7:49 PM
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wwlknsn
Joined on 04-09-2006
Memphis, Tn
Posts 154
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Re: Read this if you have never jetted your Rhino
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So,...how'd it go?!?! ww
Roostin' Rhino RAIS Power Tube
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11-05-2006, 5:32 PM
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Outlaw Baird
Joined on 08-18-2006
Posts 50
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Re: Read this if you have never jetted your Rhino
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William,
I've already spoken to ya about how it runs....GREAT!!! Outcol'd, you should feel a definate change in the low and mid range torque!
William, your RAIS held up great and allowed me to run a 25 mile desert endurance course yesterday that was designed for quads and dirtbikes (narrow and lots of bad parts) in only 53 minutes! The people racing there could not believe the speeds both me and another guy in his Rhino were doing. He was running without a snorkel at all, just straight box.
06 Rhino 660
Innova Mud Tires
Custom Rims
Underhood and Cockpit lights
Fog lights
Custom built pre-runner/brush guard
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11-05-2006, 7:08 PM
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OutCole'd
Joined on 09-21-2006
Posts 11
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Re: Read this if you have never jetted your Rhino
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| wwlknsn wrote: | |
I got everything installed. I really did not have much seat time in it before so it's hard to say how much of a difference there is, but there is definately a big difference.
My air/fuel screw was already 2 screws out from the factory, so not much help there. I did go right to the 157.5 jet. I plan on adding a billet intake so we will see how it goes. I'm doing a 40 mile ride this next weekend with about 20 other Rhino's, so I will see how mine does against the rest, some stock, some modified.
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11-05-2006, 10:07 PM
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wwlknsn
Joined on 04-09-2006
Memphis, Tn
Posts 154
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Re: Read this if you have never jetted your Rhino
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Both comments are great to hear. I did my share of riding this weekend as well. It could have been much nicer. And that Rhino was Roostin'!! ww
Roostin' Rhino RAIS Power Tube
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03-07-2007, 4:07 PM
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brutes
Joined on 02-27-2007
Posts 1
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Re: Read this if you have never jetted your Rhino
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Hey William,
I am new to the forums and new to Rhinos. The information you provide is amazingly helpful. But, for those of us mechanically challenged, do you have any pictures to go with the instructions you provide? Particularly the "Read this if you have never jetted your Rhino" and "Rhino Jetting Procedure" articles.
Thanks for the help, and I look forward to undertaking the mods you have suggested,
Cesar. |
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03-07-2007, 8:33 PM
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wwlknsn
Joined on 04-09-2006
Memphis, Tn
Posts 154
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Re: Read this if you have never jetted your Rhino
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Thanks for your observations. For some reason, I couldn't reply to your specific post so I grabbed this one from my last post, so if it ends up looking funny, that would be the reason.
Anyway, I actually have a series of images I put together awhile back that basically goes through the entire process visually but have never gotten around to posting them or incorporating them into the directions. I'd be glad to put them on here but I'll need some help from Bill to accomplish as I am unable to upload images. I actually have an RAIS Power Tube Blog and was actually thinking of putting them there but I have yet to get to it.
ww
Roostin' Rhino RAIS Power Tube
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03-08-2007, 6:39 AM
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admin
 
Joined on 03-07-2006
Yuma Arizona
Posts 163
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Re: Read this if you have never jetted your Rhino
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William, I will give you a call today and we will take care of that. That is a great idea!
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YamahaRhinos.ne... » Administrators » 14.7 to 1 » Re: Read this if you have never jetted your Rhino
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