Technical Information

TFS Technical Tips

To better improve performance of engines equipped with TFS systems we suggest experimenting with the center cone of the TFS by adjusting the cone downward towards the carb until throttle response is improved without a sacrifice of top end performance. In particular, longer cones have been developed which have generated high end rpm improvements of over 100 rpm over other flame arrester combinations. Such improvements in airflow require significant mixture adjustments so use caution when making these adjustments, and read spark plugs after such adjustments.

To better utilize the distinct features of TFS, we now offer cone lengths of 36mm, 40mm, 42mm, 50mm, 54mm, 56mm, 60mm, and 70mm. The additional cone lengths offer major performance gains if one takes the time to try different combinations and cone heights. We offer an exchange program for new cones to TFS customers who wish to try longer or shorter combinations. Just send in our old cones, and we'll swap them for cones of your choosing. All you pay for is the freight. Many have taken advantage of this program and we encourage your participation. The gains are there for the taking.

TFS for Buckshot carburetors have proved highly successful for many professional racers, and have yielded gains of over 3mph on the top end. Jetinetics offers a 70mm center cone for 44mm and 46mm Buckshot carbs. This can be ordered directly from Jetinetics and has been found to yield the best results from the TFS.

A special stainless steel bracket for the Sea Doo 720 and XP 800 twin carburetor engines has been designed to fit all TFS and also fits Ocean Pro Vortex flame arrestors. The bracket bolts directly to the stock cylinder head (and most aftermarket heads) and to the top surface of the flame arrester. This has been 100% effective in preventing the cracking of intake manifolds using these aftermarket devices. Supplied complete with hardware. Order part no. 1507-080.

Charging Flywheel Technical Tips.

As is suggested in our assembly instructions, torque is the most important factor in maintaining your flywheel. It is suggested that you re-torque your newly installed flywheel after an hour of conservative riding, and after about 2-3 hours. Regular inspection should take place after each session of riding and should include inspection of the ring gear, bore, keyway and woodruff key. Any unusual conditions should prompt a call to our technical department for an evaluation or suggestions on repairs.

A foul rumor was started sometime in 1994 that "boiling" the flywheel before installation was beneficial, this could not be further from the truth. Boiling the flywheel can damage the magnets and cause the flywheel to fail during operation. Do not boil the flywheel! It is designed to be installed cold, run until warm and then re-torqued to final specifications. Please follow these directions.

It has been suggested by top engine builders like Harry Klemm of Group K and Bill O’Neal of Watercraft Magic, that lapping the flywheel to the crankshaft surface to better seat the flywheel mating surfaces can increase the life expectancy of the flywheel. We agree that this is a good practice, and due to the difficult nature of the process we have not recommended it to the general public. The process requires the use of 320 grit lapping compound spread between the flywheel and crankshaft surfaces (in the bore) and a gentle rotating motion applied to "grind" the inside surface of the flywheel so it matches the surface of the crankshaft. The compound can be obtained at a tooling supply house or automotive parts supply house. Once the anodized surface has disappeared, the compound should be removed and all surfaces cleaned thoroughly. The flywheel can now be torqued using the normal instructions.

650 Kawasaki and 650/701 Yamaha charging flywheels which have the new steel hubs have been engineered to take advantage of a new type of magnet which is extremely powerful. The magnets have an intense magnetic field which causes a slight retardation of the timing. It is recommended that the installer advance the timing on the stator plate approximately 5 degrees to offset this condition. The engine will appear sluggish otherwise. The timing should be set to factory recommendations using factory procedures or using a timing light. We also suggest checking the condition of the spark plugs for indications of detonation.

HEAT Ignition System Technical Tips

When using any aftermarket total loss ignition system we recommend using a gel cell type battery such as Jet Works KB-35 or Baker Products battery. These batteries offer significantly improved performance over wet cell type batteries. A side benefit is that the gel cell batteries have a different internal construction which is significantly more durable than regular batteries. They will generally last several years compared to one or two seasons. Because they have a duty cycle which lends itself to the requirements of the total loss ignition system, they are much better suited to this type of use.

When racing we recommend changing the spark plug wires every season due to the intense vibration, heat and other factors which can wear down the wire and connections. A significant loss can result from using wires which have broken down due to these factors. We offer replacement wires as well as upgrades to the new Packard Motorsports Racing wires. These wires offer significantly improved performance from your HEAT Ignition System.

When installing HEAT Ignition Systems we recommend running ground wires directly to the battery. This insures proper grounding and minimizes problems resulting from bad grounds. Further, make sure you have a solid ground wire from the engine case directly to the battery.
For racers looking for extra performance from their HEAT system, we now offer a high output coil. This coil provides improved top end performance and much hotter spark. This is for racing only, not for recreational use as they create more heat internally, and cannot be run at low rpm for extended time periods without running risk of coil damage.

At Jetinetics, our continued success is measured by you. Please take a moment to give us your comments and suggestions on installation, performance or engineering changes that you would like to see in Jetinetics products and why. Tech Support@Jetinetics.com Questions and comments will be directed to YOUR technical support team.