DIrt Bike Journal | FRIDAY WRAP UP: HOW CLEAN IS THE EFI HUSKY 2-STROKE?


Final week I obtained an opportunity to experience the fuel-injected Husky TE250i within the mountains round Invermere, British Columbia. That is Husqvarna’s model of the fuel-injected KTM 250XC-W TPI. It was an unbelievable expertise for 2 causes. First, the using up there was unbelievable. The view was superior in each path! Second, I obtained to study extra concerning the bike. A very powerful truth to know is that this bike isn’t actually concerning the U.S. market. It is going to solely come right here in restricted numbers. The 300cc model received’t come to the united statesat all (for now). The reason being easy: They want all they will get in Europe. This bike was designed to cross the Euro four emission take a look at, which was carried out for all bikes manufactured in 2017. KTM and Husky are all out of bikes produced earlier than that deadline, so sellers are screaming.

The following-most vital truth is that the bike hasn’t been proven to cross any U.S. emission exams. The 250i and its twin on the KTM facet of the fence are imported as closed-course competitors autos, identical to carbureted two-strokes and unrestricted four-stroke MX bikes. However the engineers say that the brand new motor is a lot extra environment friendly that it’s not out of the query. I’m no engineer, however from what I perceive, getting this motor accepted within the U.S. is unlikely. The principle purpose a historically carbureted two-stroke is “soiled” is as a result of there’s a short interval within the cycle the place the incoming, unburned gasses can escape straight out the exhaust port. These unburned gasses are what emission testers completely hate. In a clear two-stroke just like the Rotax E-TEC system, gasoline isn’t injected into the motor till all of the ports are closed, simply earlier than combustion. The engine compresses clear air, after which, simply earlier than the sparkplugs fireplace, extraordinarily highly effective injectors spray gas into the combustion chamber. Combustion happens and burned gasses go away the engine when the piston uncovers the exhaust port. 

 

Within the illustration above, it seems that the TPI system has the identical concern as common two-strokes. The little arrow reveals unburned gasses popping out of the switch port and there’s nothing to maintain them from going proper out the exhaust. The rationale that this engine exams higher than throttle-body injection is as a result of it’s extra gas environment friendly. Husky engineers say it burns 40 % much less fuel.

In Europe, a homologated model is road authorized. It has a catalytic converter (seen above), an consumption restrictor and a throttle cease. There’s a walk-around video from a European dealership on line.

So why ought to we care? Due to the jetting concern. Each time we take a look at a contemporary two-stroke, we spend half of our time attempting to get the jetting proper. On some bikes, it’s excellent, proper out of the field. On others, it’s a nightmare. Mid summer season is when most new bikes are launched, so we regularly have to determine jetting when it’s over 100 levels in Southern California. By the point these specs get into print, it could be 40 levels in Michigan, and the whole lot is unsuitable. That concern ought to go away now.  In Canada, we didn’t have a lot temperature variation, however we positive needed to take care of a rise in altitude. The bike dealt with it extraordinarily properly. Purists will complain that EFI beings a rise in weight, and that the system is locked, so you possibly can’t alter the jetting (mapping) even if you wish to. Possibly so, however the advantages, in my thoughts, outweigh the drawbacks.

 

Ty Davis, 2002.

This week’s random harddrive search uncovered the ultimate WORCS race of 2002, in Honey Lake, California. This was the second 12 months of the WORCS program, which was based by Dave Hamel. Dave’s household was and nonetheless is deeply entrenched in off-road racing. His brother Danny had been gone for seven years at the moment, however with the assistance of his father Roger, he constructed WORCS into the largest deal in western off-road racing. This explicit spherical was received by Ty Davis, though Mike Kiedrowski used it to wrap up his second consecutive championship. Ty truly received a lot of the races that 12 months, however had a DNF that put him out of the operating.

Kurt Caselli

The race itself was a muddy mess for the professionals. The beginner courses went off and not using a hitch on Saturday, but it surely rained all evening and all through a lot of the three-hour professional race. Figuring out the riders is at all times fascinating at races like this. Within the photograph above, the one indication that it’s Kurt Caselli is a little bit piece of his identify on the quantity plate. He was second at that race.

Rodney Smith

Rodney Smith was fifth, though he was there principally as a result of it was near house. Suzuki’s off-road group invested closely within the WORCS collection beneath the management of Mike Webb. The collection stared proper after the introduction of the DRZ400, so Suzuki developed a killer four-stroke GP bike that may most likely nonetheless maintain its personal at present. Rodney, on the time, was targeted on racing an RM250 two-stroke within the GNCC collection again east the place he was on high of that recreation. The tremendous DRZ was retired the following 12 months. It was a troublesome bike to construct and manufacturing 450 MX bikes have been simply arriving on the scene.

I personally raced that weekend on what I keep in mind as the very best KX500 ever. It belonged to Ty Davis. Ty was nonetheless using for Yamaha on the time, however he had a particular affinity for the KX and knew the bike inside out from his earlier years at Crew Inexperienced. He designed his personal pipe and had IMS construct a particular, slimmer gas tank. The crank was rebalanced, the body was bolstered and Ty did the suspension valving himself utilizing Race Tech components. That bike was unbelievable. The KX500’s final 12 months was 2004.

 

I’m attempting to get a motorcycle collectively for the Previous College Scrambles at Glen Helen, but it surely’s a battle. Gary Jones talked the promoters into including a category for put up classic bikes, which ought to make it enchantment to a broader group.

 

PV Class Added to the Program!

Yep, that’s proper… After cautious consideration, and a few discuss with the workers, we’ve determined to take Gary’s advice and add a post-vintage class to the combo.

So, don’t miss the primary TT Scrambles apply this Saturday 6/eight and be a part of us for a fun-filled day on the customized course designed by Gary Jones himself.

Pre-entries are open and are inspired to assist us plan for an enormous day on the races…

Don’t miss the “TT Scrambles @ the Glen!:” weekend, there’ll be enjoyable for the entire household!

Click on right here now for more information…and hope to see you on the races 🙂

 

See you subsequent week,

–Ron

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DIrt Bike Journal | FRIDAY WRAP UP: HOW CLEAN IS THE EFI HUSKY 2-STROKE?

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