125-200cc Uptite 167

X2 I am wondering what the tq. curves will look like.

Walt,

Why do you have to break it in for 10 hrs? Or were you just being cautious? Are the tolerances just machined tighter? Or does George just do that even if he did another mod?
Have you noticed more heat being transferred into your cylinder jackets thus making radiator hotter or heats up quicker? I think the the 125's and the 250's overcool anyways.

Thanx!

Darin

Darin,

The alloys used in the Mahle piston are very hard. The expand more than a stock husky forged piston and it takes a lot longer to get the piston seated and the stresses relieved.

I am planning on taking it to a dyno tomorrow and unless I blow it up on the machine should have a curve to post tomorrow nite. Wish me luck.

Walt,

That makes lot of sense. I have been really giving some thought to the 167 after I saw your ride you posted and listened to it. You sure can tell it has some torque. Have you noticed, or even checked your engine temps vs the bigger bore? I can't wait to see your graph. Good luck but she'll do fine! I keep saying to myself, this is closest thing to a Husky 200 that I have always wanted but they never make.

Thanx!

Good on you Walt .
Just wondering if there is an option to stroke the 144 ? I assume this is too difficult or expensive?

There is a 151 bore/stroker kit but it's like $1600.

Well I just got back from running the 167 on the dyno and while the numbers aren't what I expected they weren't bad considering it was run with a new Motoz Tractionator IT on the rear. In comparison it had the exact same peak hp as a great running Kawasaki Ninja 250R with the street tire. The ninja is the local shop formans bike. The impressive thing was the power curve. They couldn't download or e-mail the curve to me so I had to create a graph with lines connecting the dots. Not perfect but you will get the idea.

I hope the graph shows up.

Horspower is red and tq is green, looking at the plot vs the curve they are nearly identical.

You must have been getting a lot of rear wheel slippage. I would have expected much higher horsepower figures. I think the KTM 150 puts out about 39hp. I am sure the Husky WR150 puts out pretty close to that.

very linear power curve - I guess its the power at 7000 which would be impressive over a 125. Does a knobby tyre reduce the power or torque - less grip ?

whats surprising is they both max at roughly the same rpm
I dont think you can compare too closely as different dynos - different results

I think gsxr1000user had a calibration error as respect to the rpm. He said that his graph is registering about 1000 rpm low.

The knobby was definitely slipping and hopping even with 200#'s on the seat. It was a rough ride. Probably wore the tire more than 200 miles of dirt riding. The tech was commenting that by the time I did 3 runs with the 3 different top ends it would be bald.

Every time the power valves opened it got crazy. If they say the knobby costs you 10-15% I would believe it. Also it is virtually impossible to compare one dyno to another. The conditions and dyno's all vary I don't care what anyone says. The take home will be the comparison between all three cylinders on the same bike on the same dyno. I am not going to vary the powervalve springs either. All these runs will be with the stock spring and white inner.

Dwight,

I know that my 167 has at least as much hp if not more than my 144/150 top end. We will be able to compare in a couple of weeks. My 144 rips and I think that we will see that extra 1000 rpm on top too. My best comparison to date is that the 167 will climb steep loose hill climbs at least one gear higher than the 144 both running WFO.

Walt,

Keep up the great work! Neat Stuff! Can't wait to see the numbers between all 3. I don't know much about Dyno's. But if you do the same with all 3 we should be able to see some differences. Sure wish I lived closer! I would like to throw a leg over that bike!

That thing has got to be churning more HP than a 150.

I want to get a CR ignition to give it a try. Until then is there any advantage to increasing the WR timing? Or would I gain in one place but lose in another? I am running race gas.

Thanks

Doesn't look to bad against the previous thread Dyno, KTM VS TM VS Husky 150's.

Say you got some torque going, maybe titch more HP?

I'm kinda happy with the results of the RM needle and one,two,five jetting going back to GSXR's Dyno run?

Darin,

Yep the 167 has pretty impressive numbers compared to the 144's below 8000 rpm. That is pretty much what my butt dyno has been telling me. Above 8000 I think the dyno results I got are probably a little off because of how that very aggressive Motoz was hooking(or rather not and hopping) up on the dyno. But once again you really can't compare numbers too closely just curves.

NWRider,

I am going to have a spare set of CR 125 ignitions short of a coil in a few weeks when I get mine back from Ricky Stator where they are re-winding for lights. I will send you the spare for you to try and then you can decide if it is worth it.

Great stuff keep it coming!

I would imagine George has some figures on the hp of this as he's been producing it for a while. He had a working dyno in his shop at one time IIRC.