Hi All,
Has anyone noticed a change in gas mileage after installing the raptor petcock. I have a 2007 s40 ryca cs1 conversion w/ 1.5 gallon tank. My fuel air mixture screw is set to 1.5 turns out and I noticed that I had to change to reserve after 25 miles as opposed to 30-35 on stock petcock. I also read that the reserve setting on the raptor lasts about 20 miles which gives me 45 as opposed to at least 60 before. Any thoughts?

If I'm reading this right.You have something else wrong too.Even as big as I am,I get close to 50 mpg.You're saying you only get about 30 mpg?I can maybe see a drop a little that maybe the raptor flows a little more than the stock one.waiting on my raptor.

You only have a range of 45-60 miles including reserve.....Yikes!  I betcha it takes a long time to get anywhere when you have to stop for fuel that often.

I guess if we make a habit out of stopping every 100 miles with the stock 2.8 gallon tank - it only makes sense you are going to go half that far when they cut the tank down to only 1.5 gallons.

You should be getting between 50-60 mpg on the RYCA, windshields and big bodies can reduce that mileage.

Here is a photo that compares the height of the intake tubes on the stock vacuum petcock and the Raptor.  The stock petcock gives you more reserve and less miles on the main tank.....the Raptor give you more main tank and less reserve.  However.....they may have made the original petcock screen shorter for the RYCA tank, as the stock one may be too tall for the tank.


   
 

Thanks for the pic Dave!

It could make a difference in mpg if your old petcock was bad, and starving the engine...
If that was so,.. you'd probably have noticed some poor running at open throttle...

Otherwise,.. both pets are just gravity flow and will have no effect on mpg's...

Your mpg's are very low... is your air filter clean?... or over- oiled?...

Correction from earlier, the ryca cs1 gas tank is said to be 2.5 gallons, .3 less than the stock.  I have the exhaust from ryca and the small k&n filter as well.  I filled my tank from bone dry (after installing the raptor petcock) and added 1.5 gallons of 87.  At roughly 25 miles I ran out of gas on main and had to switch to reserve. This morning I filled up right away and was able to put in 1.5 gallons. If ryca's calculations are correct the top of my reserve is at about 1 gallon. Don't people usually say raptor reserve lasts 20 miles?

HighME32 wrote on 11/07/14 at 00:37:46:


The amount of reserve in the stock tank cannot be compared to the amount of reserve in the RYCA.  The bottom of the stock tank was cut off to adapt the bike to the RYCA....and the amount of fuel below the main tank inlet is not going to be the same as the stock tank.

Now that you are a member of this site you can do your part to provide this useful information........Here is your homework assignment.  Fill up your tank, and get three 1 gallon jugs.  Level the bike up, take the fuel line off the carb and run it into a gallon jug, then turn on the Raptor petcock to ON.  Measure how much fuel you get....and watch the jug as it most likely will be more than a gallon and you will have to switch over to a second jug.  When the fuel runs out.....record how much fuel that was in the main tank.  Then get another jug and turn the petcock to RES....and measure how much fuel you get.  Not sure if there will be some fuel trapped on the right side of the tank......at least for the main tank there most likely won't be any difference.....for the reserve you might want to wiggle the bike over to the left side to run any fuel trapped in the right side over to the left side where it can flow out the petcock.  You should dump the reserve fuel into a Ratio Rite or similar measuring device that can measure accurately.....it will most likely be around 60 oz. of fuel.

This is good information for all the RYCA folks.....and worth you spending the time on it. What else have you got to do on these cold wet fall nights?


I did this for the stock tank when I changed mine to the Raptor.  The stock vacuum petcock provides 2.18 gallons of fuel on the main tank and 78 oz. on reserve....if you get 50 mpg that is 109 miles on the main tank and 30 miles on reserve.  The Raptor petcock provides 2.32 gallons on the main tank and 60 oz on reserve....which is 116 miles on the main tank and 23 miles on reserve.  This supports why we recommend you stop for gas every 100 miles with the stock tank.

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1340021926

Prechermike:

I used 50 mpg in those calculations to be a bit conservative.  Folks who throw in big pilot jets and crank the idle fuel screw open in an effort to reduce the backfire can get some crappy mileage as a result.

I get somewhere around 58 mpg on my bike if I ride sensible and don't go much over 60 mph.  I don't have a windshield and I weigh about 160 ready to ride, and my bike is a Cafe' conversion and tips the scales at about 320.