ASK THE MXPERT: CAN YOU GIVE ME 2016 KTM 350SXF TIPS?

September 1, 2015
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ktm350wheelie
Dear MXperts,
I just bought a brand-new 2016 KTM 350SXF. It is the first time I’ve ever owned a KTM and, obviously, the first time I’ve ever owned a 350. I need to get up to speed as fast as possible. Please tell me what I need to know about my 350SXF because I know nothing.

ktm350side

How much do you want to know? Here are few 2016 KTM 350SXF tips.

1. Shock spring. You didn’t say how much you weigh or what class you race, but the stock 48 N/m shock spring is too stiff for anyone under 180 pounds. If you weigh less than 180 pounds you will not be able to get any preload on the shock spring. We run the 45 N/m shock spring from the 250SXF. The shock needs to have preload on it—if you can’t get preload on the spring for your weight, then you need a lighter spring. We run the low-speed compression at 15 out, the high-speed at 1-3/4 turns out and the rebound on 10.

2. Race sag. We run 105mm of sag. KTM recommends 110mm of sag, but this is way too much and not only eats up shock shaft travel, but kicks the head angle out so much that you have to slide the forks up very high in the clamps to get the bike to turn.

3. Peak power. The KTM 350SXF makes makes 54.41 horsepower, which is more than a CRF450 makes, but it makes its peak horsepower at 13,200 rpm. That means that if you shift before peak, you will get less horsepower. Thus, you should never shift. To help with this high-rpm necessity, we run a 51-tooth sprocket. It tightens up the ratios and helps get to 13,200 rpm quicker. We repeat—do not shift.

4. Sprocket bolts. Watch the sprocket bolts. They come loose all the time. Check the ones next to the rear rim lock every time you ride. It is the indicator of trouble to come.

5. Tubes. The stock tubes are very thin and light Pirelli tubes. You will get flat tires with these tubes.

6. Neutral. Neutral is hard to find in the pits, but that is so that you can’t accidentally hit it on the track.

ktmcompression

7. WP 4CS forks. The 2016 forks are lightyears better than previous WP forks. Unlike in the past, you can ride with them without too much drama. Fast test riders turn them in (stock comp and rebound are 15 clicks out). We’ve had Pros run them at 1 click out, 6 clicks out and when Mike Alessi rode our bike he turned them to 11 clicks out. Slower riders will be happy in the 12 to 16 click range. Never in the past have we been able to turn WP clickers inward—because the forks were also too harsh to begin with. These are not the greatest forks on the showroom floor, that honor belongs to Yamaha’s SSS forks, but they are decent production forks.

ktmshockremoval

8. Exhaust pipe.  To remove the exhaust pipe you have to remove the rear shock. There is a trick to doing this, which we showed in the August issue. Aftermarket pipes don’t need to have the shock removed.

ktmBattery

9. Battery. When cold weather arrives you should pre-heat the Iron Phosphate (LiFeP04) battery before trying to start the bike. We touch the starter button enough to activate the starter, but not enough to get the bike to turn over. When you do this you can hear the starter clicking over (or feel it with your hand on the gas tank). We do this two or three times. Why? Because Iron Phosphate batteries get stronger as they get warmer. Then, once we have the battery preheated we pulled the choke down (not up) and start the bike.

ktmshiftertip

10. Shift lever. We have broken two shift lever tip springs in the past couple weeks. The spring that makes the tip flip in and out snaps. When it happens at the track, we wrap duct tape around the tip to keep it in position so we can race. Because the tip is riveted on, there is no simple way to replace the spring. KTM tells us that they have a better spring already in the works, but we don’t know that means to people who already have their bike.

11. Spokes. The rear spokes will come loose for a very long time. It takes them quite a while to seat. Always watch the spokes next to the rim lock. If they are loose, then the rest of the spokes are on there way. We check the spokes at every race (and sometimes between motos).

ktmdial

12. Maps. There is a switch on the right side of the handlebars that allows you to choose between the stock map and aggressive map or mellow map. We always run the aggressive map. When the switch is in the forward position the bike will always be on the stock map. When it the switch is moved rearward to the two dash marks, it will be in whatever map you select on the map selector dial in the airbox.  In the upper right hand corner of the aribox is an rubber-covered dial. Pull the rubber cover back and you will see a dial with ten numbers on it. Whatever number you choose on this dial, will be the map on the rearward switch position. But, there is a trick. Map #1 is the mellow map, map #2 is the aggressive map and maps #3, 4, 5, 6, 7, 8, 9, 0 are all stock maps. If you choose 3, 4, 5, 6, 7,8, 9 ,0 then both switch positions will be stock maps. We put the dial on #2 (you have to look closely to see the white triangle on the side of the dial that indicators what number you are on).

13. Launch control. The 2016 KTMs have launch control. You activate it by flicking the map selector switch back and forth. When launch control is engage the EFI light, behind the front number plate, will flash rapidly. Be forewarned. Launch control will only stay engaged for three minutes or until you rev the engine and then let the rpm fall off 30 percent or more. What does that mean? If you engage launch control on the starting line and then blip the throttle or do a burn-out, you will no longer be in launch control. And, you have to turn the bike off to re-engage launch control. The best strategy is to wait until the board turns sideways, then flick the switch to activate launch control. Once you begin to rev the engine up be careful not to let the rpm fall off. If you do, you will revert back to whatever map you chose. It is very tricky to hold steady rpm in the rush of the start process.

ktmfuelfilter

14. Fuel filter. KTM installs inline fuel filters in their gas lines. They can be accesse via the quick release fitting on the fuel line. You can flick the small nylon filter out and check them for debris. They can be back flushed or replaced. Clogged filters hurt the fuel pressure and flow. Be very careful to make sure that the fuel line clicks back together completely. We have had the quick releases pop off because we didn’t get them clicked.

15. Shock preload adjustment. When we need to adjust the preload on the rear shock, we do not hit the red shock collar with a hammer. Instead, we turn the shock spring by hand while using a long flat-bladed screwdriver to pry against the frame and the shock collar at the same time. If you hit the nylon shock collar with a hammer and punch, you will deform the notches.

ktmbrakespring

16. Rear brake pedal spring. Turn your rear brake pedal spring around so that the tangs on the spring face inward. If they face outward, you can hit them with your boot and unhook the spring. We also crimp the tangs once they are turned around to make them fit tight to the pedal.

17. Gas cap. The gas cap sticks. Be careful not to torque it on too tight because sometimes it takes Mr. Universe to get it off.

ktmplugs

18. Ignition cover plug. The small Allen plug on the back of the ignition cover can leak oil (although not enough to create any major issues, but it does make a mess). This plug can be sealed with high-temp silicone. The Allen doesn’t attach to anything, it is there to blocks a hole that was drilled in the case during manufacturers to make an internal oil line make a 90-degree bend.

 

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