125-200cc 144 kits

I just noticed motosportz has some 144 kits in stock finally.

Is that the Athena kit? Later head design ? Cost ? Maybe Kelly can give us some more info.

The must be starting to arrive. I got 2 of them today in Canada.

I think its a new casting. Compared to my 06 barrel the bore is 4mm bigger obviously but the walls looked to be the same thickness. As above it is not Athena and the piston is Asso Werke.

Here's a pic of the cylinder:

Can these be rebored - re-sleeved or whatever is done up to 167 cc? Walt has made comments about the later head not being able to taken to 167cc. but older head can.
(I dont really know if it would be required anyway)

Rockdancer,

Husky changed the configuration of the rear transfer port in the new cylinders and they also changed how they machined the power valve slots into the cylinder. Both of these don't allow enough room for the bore to much exceed 58mm. If you re-sleeve the power valve slots aren't an issue but the rear transfer will be mostly lost. It will be interesting to see if Husky changed the rear transfer for the new oem 144 or they just bored it to 58mm.

Walt

Great looking parts Kelly! I think the kit is a bargain for that price. Give us a comparison shot of the 125 vs 144 kit power valves. I also noted that they have adjusted how far they dive in the boring tool for the Power valve slots and changed the casting and sleeve on the rear transfer to allow more meat in the cylinder sleeve. My take is that there is much more room to bore it further than with the stock 125 cylinder.

When Kelly takes pics of the old vs new power valves, I will post similar pics of what I have done to mine that yields an amazingly torquey 144. It certainly pulls the 13x50 gearing everywhere.

Walt

Sure wish you had this kit back in January when Husky said it would be here.

Don't you just love the look, feel, and smell of brand new top ends.

Kelly,

If you look at your second picture above you can see the tooling gouge in the exhaust port. After the stock 125 cylinder is bored to 58mm that gouge is only about 1mm from the cylinder wall. In the oem kit it appears you have at least 3-4 mm of cylinder wall there.

The limiting factor in how far you can bore this cylinder out is the rear transfer port. In you 3rd picture you can see that Husky machined the back of the sleeve as well as the cylinder housing to allow more flow. In this area it looks like you have about 3mm of sleave left. My guess is that you can only take the cylinder out about 1-1.5mm more before this area becomes too thin. In the older cylinders the rear transfer was contained completely in the cylinder housing.

Attached are some pics of a new 04 CR 125 cylinder. As you can see there is significantly more sleeve area for potential boring. This is what you need to bore it to the 62.5mm bore for a 167. You can also see that the older cylinders have an additional side transfer created by adding a bridge. I am sure the newer cylinders have improved flow characteristics.

Walt

I put about 30 miles on my new 144 yesterday. What a diiference the kit makes. The bike just climbs up hills with no effort and the mid range power is great.

Chris

Thanks for the info Walt - looks like Kelly has finally succumbed to the 144 temptation !
I hope there is a kit available when I can get one too.
Kelly - you should dyno the bike before and after for a comparison - with PWK and Mikuni would be great as well ... will be a good selling tool. ( not that youll need help)

im interested in a side by side comparison of a husky kit and a EG kit.

does the new husky piston have a coating like the other stock pistons im told have?

razornpc,

The new piston is coated as are all the stock 2T pistons. I can tell you that the Oem Kit is a superior piece to what I got back from EG. My cylinder came back with un-chamfered ports and quickly ate the lining because of this. EG also severely relieved the exhaust port bridge and this caused some very strange wear paterns besides the lack of chamfering. The head work that EG does is good and his porting work is the wild card. But for me bottom line is that you can't match the quality of the Oem kit. After I had George at Uptite chamfer and then re-line my 144 cylinder it has been flawless and runs incredibly well once I got it jetted with the PWK. So I am currently ~$800 into the EG kit to get about the same results as the Oem Kit and I don't have my original 125 parts for back-up.

I hate trashing anyones work and hopefully mine was just an isolated case but the facts are what they are.

JMHO,
Walt