The Ultimate 300 Build Thread - 2014

[barefooter]

Randy hasn't posted much lately. So I will.

Finally got my "Merry Xmas to me" present from Randy. What a hotrod!

 

[tedesweden]

my own buildt tedesledd highmark kitt on the 300 smokers ...

 

[mtn-doo]

Fun day in the deep pow for sure. Glad you are loving it! Things will slow down in a week or so and I will finish this ultimate build and include some video through out the season. Expecting the last surprise any day. There was a delay in some pieces of the puzzle.....

 

[wwillf01]

No, but super nice to have. Remember to ALWAYS take this stuff off and shelve it in your shop. You will be glad you did down the road. Some of these things are good to have on hand. You will use them and get a lot of good from in years to come. I have 2 stroke AFR, 4 stroke AFR and a quick response EGT at arms length at all times. I also have a pipe with a probe I swap from bike to bike to dial in tuning. All with tuning aid's universal for everything.

Now the only way to power the egt would be with a larger stator on a cr500?

 

[mtn-doo]

Finally here! There was a delay in some parts but it's all here now. Time to resume the Ultimate 300 Build. Time to make some HP. Forward Motion / Millennium Tech have been developing and testing a new engine for the 300 platform all summer. It is a big 30CC over bore making it a 330. I had the porting work done for a "Big Hit" and max in the mid to high RPM range. The head was also done by them for the over bore and compression for my altitude. The piston is Molly coated and hard anodized. The rings are super high end Titanium Nitride. This piston and ring combo was good for 200 hours in testing. In their testing, the stock 300 with the little 36mm carb and stock pipe and cdi made 51hp. With the 330 kit, everything else stock, made 57hp. So starting with a base line now of 57hp, we add the 40MM Carb for a big boost of 5hp on the dyno in testing, and the Scalvini Pipe imported from Italy for another boost of 6hp in the mid and additional 3hp overall. Then the race CDI box for some more. That makes the 330 a conservative 62HP. That is significantly more than the average 450 and rivals the old KX/CR 500's. With the modern technology in cylinder design and power valve benefits along with electric start, this will be a super nice package. I will include the Scalvini Pipe Test results.

 

[mtn-doo]

SCALVINI Pipe test by Dirt Bike Magazine.

Scalvini may not be a household name in the U.S., but it’s a major player in the exhaust wars in Europe. The easiest way to describe this pipe is “moto art.” Those of us old enough to have been around during the days of factory two-strokes remember that a hand-welded cone pipe was an object of desire. The big hitters in U.S. exhausts, Donny Emler and Mitch Payton, started their companies by building this style of exhaust pipe. The task of cutting individual strips of metal and hand-rolling and -welding them into an exhaust is extremely labor-intensive and costly. Scalvini is still building their pipes the old-fashioned way. The cost is elevated, but so are the performance gains. The easiest way to detail the build process is to check out the photos at this website: www.scalviniracing.com/ eng/factory.jsp. When it came time to slip the pipe onto our bike, we were a little nervous about everything lining up properly because of the hands-on manufacturing. Foolish us; the fit was perfect.

Just rolling on the throttle at low rpm, the motor seemed to pull a little harder and wanted to rev quicker. This feeling continued into a meaty mid that continued to a higher rev ceiling. The Scalvini is the only pipe that felt like it increased power throughout the entire powerband and provided an increase in over-rev. The bike seemed to build revs quicker than some of the other pipes tested.

The Scalvini silencer is not a U.S. Forest Service-approved spark arrestor; it’s a closed-course race muffler designed to complement their pipe. The muffler has an aluminum canister with a carbon fiber end cap.

Typical of a shorter muffler on a two-stroke, this one makes the motor snap to life sooner. With the pipe, this system really makes the KTM rip. The power comes on faster and harder than with the stock muffler. As a full-race package, the Scalvini pipe and muffler combo resulted in the greatest power gains we experienced. The only drawback to the combo is that the short muffler made the power almost too intense, too instant. This could prove to be a handful in low-traction conditions. On our tacky test track, this combo was lethal—but so is the price tag. It’s not a cheapie.

Contact: www.scalvinipipes.com

 

[Hawkster]

That has to be one of the most beautiful pipes I've seen in a while .

 

[chumbilly1]

In one of those mag exhaust tests they say the Bills pipe and silencer produces the best topend performance. Scalvini is pretty though.

 

[Hbmtr]

Had a Scalvini pipe on my ktm 150xc,awesome pipe for top end.Gave up a little on the bottom end but thats what the clutch is for.Only downside is the beauty of the pipe comes at a cost.Would hate to crush it.

 

[x-5]

Well so much for me being the only one in mt with that pipe..lol

 

[mtn-doo]

Yes, they said it pretty good. "Moto Art". Maintenance is a 5 minute little pain in the rear end. Wipe down with CLR then spray and wipe down with WD40. For a Demo/show bike. It will be sharp.

 

[mtn-doo]

In one of those mag exhaust tests they say the Bills pipe and silencer produces the best topend performance. Scalvini is pretty though.

Yes, I read that also. I looked at Bill's closely. When you read the description closely, they said it was difficult to keep on the top end. Any drop in RPM required a down shift, then back again. With the snow bike application I think that might be difficult. The PC - II was similar. Great on top with decent mid. What I liked about the Scalvini was the quote, "too intense" and "too instant" and "most HP gains through out the entire range". I think that pipe on this 330 will be "quick" and "explosive" in the trees....? Can't wait to start testing.

 

[x-5]

So you going with the 40 smarty on the 330?

 

[mtn-doo]

So you going with the 40 smarty on the 330?

Yes, the 40MM billet and I will likely be running the Q07 or Q05 rod. That bore increase and flow will likely need it.

 

[the gman]

I have been running that pipe this year. Works good, did you bite on there silencer also??

 

[mtn-doo]

Yes. I want to try both at altitude. The all carbon "shorty" no. The Aluminum/Carbon one is in the middle for length. The super quick hit may be the ticket for the steep and technical stuff we like. If I find I am wanting more over-rev, I will use the PC 304 Factory on the Scalvini Pipe. That combo is very popular with the Dep pipe. They love the PC 304 silencer. That added length is a real beneficial at altitude for over-rev. I will test both and choose a favorite.

 

[chumbilly1]

Keep us posted! I spoke with the tuner who did my porting /headwork and they gave me several good ideas for how to increase top end. Cant wait to try. According to them the fmf fatty gave equally impressive results in peak numbers when tuned properly and used on pro level mx bikes. Not at elevation though. Since I get fmf on a support deal and I already have a fatty I need to see it to believe it ,so to speak. There was just a scalvini on seatttle craigslist for $200 a couple of weeks ago.

 

[mtn-doo]

Finally all caught up. Let's finish up this Ultimate 300, "330 now", and get testing and filming.!

The new cylinder and piston installed, the 40MM Smart Carb installed, the Avid Products Carb heat system installed, now to make those frozen cold morning starts easier. I welded and painted a hanger from the head stay for the primer. Painted in metallic silver to match the OEM head stay. Looks super clean. Tapped into the fuel line with my 1/8 inch primer line. Drilled and tapped the front side of the carb and installed the brass nipple to feed the intake. As a safety check for any dribbling fuel under vacuum, I installed a Billet 1/8 inch fuel shutoff to close after priming. Looks trick and custom as well as makes for easy cold starts.

 

[mtn-doo]

Installing SRT Radiator Guards for tree branch "stabbing" protection as a second reason. The primary reason is to keep the direct snow contact from the aluminum radiator fins. Stopping the majority of the direct snow contact will not drop radiator temps as low helping to maintain a more consistent radiator temp. It may raise temps slightly, but the objective is to help reduce those huge drops from a blast of pow.

 

[mtn-doo]

Timbersled ST Kit installed and forks back from RG3. These guys specialize in a fork set-up specifically for Snow Bikes. They are amazing feeling. Soft and smooth on the high speed chatter and progressive on the big hits and "G-outs". The rebound is about perfect. Not so fast as to push the bars back at you, but enough to always have a full stroke available with out them having to hurry. Super nice forks. Contact RG3, Inland Northwest. Spokane, Wa. A sneak peak of the super cool graphics.