JIMS new 53mm Ellipse Throttle body

5. Nolen started assembling the JIMS throttle body by installing the large o-ring into the groove of the manifold before bolting it to the body. This will ensure a good seal and no intake leaks.

6. Next, Nolen removed all the induction components from the stock unit and installed them onto the new JIMS throttle body. First the throttle position sensor (A), then the temp sensor (B), followed by the idle control valve (C).

7. Then, the pressure sensor was installed (D), and the stock fuel injectors, fuel rail, and fuel supply tube.

8. With everything together, the throttle body was placed on the engine. We found that we needed to remove about 1/8 inch of material from the intake flanges to get the body to sit further back and line up with the intake ports on the heads. Here, Nolen used a belt sander to ensure that the flanges were even. The manifold is designed with the flanges longer than stock so it can be used on different engines. With all the different manufacturers and engine sizes out there, JIMS wanted to make it so that with a little modification this throttle body would work with S&S heads, H-D heads, and any other big-inch engine configurations.

9. Once we got the body to line up with the intake ports we needed to also remove a small amount of material from the top cylinder fins so that the bigger throttle body would allow the filter backing plate to line up. Once that was done the body was bolted in place to the heads and all the wires were reconnected.

10. Next, the air filter backing plate was installed. There are two small o-rings that fit inside of the mounting bung on the plate. This will ensure a good seal once the breather bolts are on the heads not letting any oil blow by.

11. With the backing plate bolted in place the seal caps were installed using the supplied JIMS tool part #2233, then the high-flow air filter was bolted in place followed by the stock H-D filter cover.

12. The gas tank was reinstalled, the battery was reconnected, and the bike was ready for some more time on the dyno.

13. Once the bike was up to operating temp, and with a fresh base map the bike pulled 91.3-hp and 102.2 lb-ft of torque. You can see how well the torque curve was delivered to the bike through the 2,000- to 3,500-rpm range. Right off the line this bike has neck snapping, wheelie pulling torque. And the torque continued to steadily climb up into the 3,800-rpm range. The horsepower is a nice smooth increase from 2,100 and well into the top end. The one thing the owner liked was the bike was not falling off at the top-end like before and now the bike was ready for the owner and his riding style.