YZ155 Pasha Afshar & Chris Heinrich Build

Pasha is a cool guy. Nice bike!

A video ripping a good practice start might sound and look pretty damn cool! 💪🏼

Yes, please!

*Sigh... Add this to the list of bikes that I want...🥲 

Awesome!  I'll bet that bike barks.  

The rubber mounted head stays look interesting.  They look like Fasst bar cushions.

When did they go up to 155cc ?

Not that 125 privateers didn't have them back in the day 😎

Sic

Sounds like a dream build!!

Those big bore YZ's can be made to rip.  My eric gorr 144 was pretty dang good... and I think rpm used to or still do make a 167 that is apparently a monster.

I had a 99 yz 167 done by Rick thing was a beast.

Raced 40+ Int back then when the gate was loaded with 426 4 strokes...killed em!

Not many positives about getting older. Especially if we love moto and still ride. But having some "extra cash" to burn on things like this is maybe one of them. Keep er 2 wheels up and have a blast with that. I wouldn't mind contact info for them as I have a 2015 YZ125 sitting in my shop.

I am an old guy still moto-ing, too! How did the JBI volume spacer and pro perch change the feel of the suspension for you?  How would you describe it?

Pasha basically gatekeeps Varner at this point. 

Great to hear.. I still haven't been able to try my fork set up yet as I have been waiting for the lower fork tubes to come back from DLC coating, but should be back together in the next week or two.

I also have a YZ144 with a Varner engine that was built for Loretta Lynn's.. quite an engine.. surprising low end for a small engine, power band is still very wide as the same time so no discernible compromise on the top end.  The bike is very easy to ride for a tiddler engine.

SWEEEEET!!!

On ya m8 - mint bike. Keep us updated. Hope I'm fortunate enough to be doing cool shit like this in my 70’s. 

I’m considering building a small bore YZ myself.  I notice from the pics a pretty big flywheel weight here.  How big is it?  I am accustomed to using weights on bikes like yz250’s when used off road for traction, what is the goal with it on the small bore? In my way of thinking it will slow the response and on a small bore that seems counter intuitive no?

Save some serious coin and install a big-bore/stroker alternative, the STIC Super X PWK 38/40mm carb. Run everything stock. Yeah, it isn't a sick race build from an elite tuner, but it'll provide a broader and more versatile powerband. Rich Taylor on a otherwise stock CR250 test bike got his only SX main holeshot with a less potent 90's version. There's a published interview regarding this.

Savage power gains on pump gas for my big-bore long-stroke 200SX. 5+ years, reliable as stawk. $700 vs $5k!

Apologies, but I am not quite clear . . . You mean you have a KTM 200SX that has been bored and stroked? Or that the STIC Super X PWK 38/40mm is an alternative to that? 

Here is an official Pasha Racing video that we posted on 2-Stroke Tuesday. Pt 1 of 2 from this weekend's World 2-Stroke Championships.
 

I posted the first of two videos from this weekend's World 2-Stroke Championships just above (or down depending on the comments😉) for your viewing pleasures!

Pretty epic as the top 5 bikes in the Pasha 125 Pro event were all Pasha Racing bikes, his support and passion of these races is second to none. Pasha supplies insane bikes, pays riders and asks for nothing but smiles and good times in return.

Great to be a part of it all, we have put on dozens of paying races as well as doing the 125 Invitational a couple of years back at the Hangtown National. Been buddies since the old mid-nineties LACR days where we met and started the dream.

The STIC being an alternative to a big-bore and/or stroker. 

Intuitively, carbs are simply not seen as offering significant power gains for small engines. Hard to imagine how a carb could extract more power without altering anything within an engine. Especially in the case of a 40mm carb on a 125 at low rpm vacuum signal. So, how to get a carb to be hyper responsive and get the early abundance of AF mix to burn efficiently?

The STIC tech offers extremely aggressive fuel uptake and you can see similar tech used in lifting emulsion to the surface from low pressure oil reservoirs via pressurized gas introduced to perforations in a wells production tubing. I recognized this practice immediately from operating this system. 

In a similar fashion, an engines vacuum signal via carb passages can create a suction/lift from the float bowl. 

There are also processis that create higher pressure/velocity at the base of the needle jet tube, along with a lower pressure at the tubes upper orifice into the carb venturi where back pressure can restrict flow. Ideal efficiency not present in std or meter rod needle jets. In this process the AF mix transitions to a cool vapor state. Also, stepped passages within the meter block create pressure drops, as with an air conditioner. So heat is not creating vapor here. BTW, vapor travels faster than atomized AF within an intake tract and will have a more efficient/complete burn. No need for high compression and a tight squishband to force better combustion. End result is extracting more energy with unchanged engine parameters.

+1 for STIC, as I understand it the holes in the emulsion tube get the mixture spinning up past the needle which really helps vaporisation. I know five bikes running STIC 150s and 250s and they all got the same excellent results across the rev range, also, they run cooler. Hard to believe I know.. STIC likes the viscosity of 40:1 (Castor 927). 

Yup, the perforation holes are angled as to create a vortex and the physics of the vortex creates a cooler core temp. My 200SX ran smoothest at 32:1.

I've come across two 125 riders that said the abrupt character at the crack was too aggressive for them. This was the meter replacement block version, not the more potent Super X version. Anyway, they removed the STIC. They could have opted for the trail version.