Ok do heres the deal... - Yamaha Rhino Forums - Yamaha UTV Forum
Yamaha Rhino Performance Discussions Yamaha Rhino performance discussions.
Engine mods, CDI boxes, exhausts, etc.

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post #1 of 14 (permalink) Old 06-22-2008, 05:55 PM Thread Starter
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Ok do heres the deal...

My Rhino is STOCK as far as the engine goes. I have a CDI and one of the home made RAIS intake. I am looking for some more power but keeping reliable. I was thinking of a cam and some port work to start with. Then maybe a bigger carb and exhaust... Any input would be great.. What kind of cams you guys running?
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post #2 of 14 (permalink) Old 06-22-2008, 06:05 PM
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Imo anytime you start modifying the engine, it tends to be less reliable now Im no expert but, most people tend to just stick with the basics, CDI and Sheave and maybe intake and exhaust. those four things should bring you to 60mph or so.
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post #3 of 14 (permalink) Old 06-22-2008, 06:16 PM Thread Starter
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Yea, i know extensive engine mods can make the reliablity suffer. Just wondering what kind of gains people saw with teh cam and port work...
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post #4 of 14 (permalink) Old 06-22-2008, 06:39 PM
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s2k1 would be the guy to answer that question. you can add a ron wood pipe, a sheave and duners kit, proper jetting and it will move damn good and be very reliable. The port job is only gonna be a good thing, the cam, I have no experiance with, so I leave that to the motor guy.
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post #5 of 14 (permalink) Old 06-22-2008, 07:16 PM
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i did the head port polish , 10 3/4 piston bigger valves and stud kit and mudbuster cam stage II (( still 660 bore)). It made a little difference but not as much as i hopped the power is now good from bottom end to top and on the dyno the power curve is almost flat. Before the mods it would peak then fall off. I still have a stock carb , single FMF muffler on a stock pipe with a intake that is outside yhe engine compartment with a uni and a 205 main jet, and it run 13 to 13.5 with the mass air sensor

thats my two cents
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post #6 of 14 (permalink) Old 06-22-2008, 08:05 PM Thread Starter
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Originally Posted by dentedmetal View Post
i did the head port polish , 10 3/4 piston bigger valves and stud kit and mudbuster cam stage II (( still 660 bore)). It made a little difference but not as much as i hopped the power is now good from bottom end to top and on the dyno the power curve is almost flat. Before the mods it would peak then fall off. I still have a stock carb , single FMF muffler on a stock pipe with a intake that is outside yhe engine compartment with a uni and a 205 main jet, and it run 13 to 13.5 with the mass air sensor

thats my two cents
Thanks for the input.... So it made a difference just not as much as you would have liked. I am at a road here where i was more power and looking at different options to get it. I have a friend with a CBR900RR engine for CHEAP that i am also concidering for power plant.
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post #7 of 14 (permalink) Old 06-22-2008, 08:24 PM
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Personally...I would stick to the mods Max listed.....When you have to break into the engine do all the port work and cams.



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post #8 of 14 (permalink) Old 06-22-2008, 08:27 PM Thread Starter
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Yea, im sure you know how im feeling. I LOVE my rhino and all but damn i wanna go faster!! and im worried that for what it costs to make the "rhino" engine fast i could have something else in it MUCH faster...
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post #9 of 14 (permalink) Old 06-22-2008, 11:51 PM
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Quote:
Originally Posted by dentedmetal View Post
i did the head port polish , 10 3/4 piston bigger valves and stud kit and mudbuster cam stage II (( still 660 bore)). It made a little difference but not as much as i hopped the power is now good from bottom end to top and on the dyno the power curve is almost flat. Before the mods it would peak then fall off. I still have a stock carb , single FMF muffler on a stock pipe with a intake that is outside yhe engine compartment with a uni and a 205 main jet, and it run 13 to 13.5 with the mass air sensor

thats my two cents
This combination's potential is not being seen, IMO. The exhaust is restricting it like crazy. Exhaust on a stock engine doesn't do much, but on a motor with those mods, it does.

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post #10 of 14 (permalink) Old 06-22-2008, 11:55 PM
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Quote:
Originally Posted by RoamRocker View Post
My Rhino is STOCK as far as the engine goes. I have a CDI and one of the home made RAIS intake. I am looking for some more power but keeping reliable. I was thinking of a cam and some port work to start with. Then maybe a bigger carb and exhaust... Any input would be great.. What kind of cams you guys running?
Think of it like this: An engine is basically an air pump. The whole combination needs to be well matched to see it's potential. If you port the head and put a "big" cam in it, it will be "capable" of moving more air but will be limited by the exhaust and carb. I would do the carb 1st, exhaust 2nd, (or vice versa), and the porting/cam last or all at the same time.

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