YZ426 Blaster

[Paulie B]

Thanks man! It's got the show but not the go yet. The cylinder is @ Boretech and the carb comes in 2 days.
We are ready

[Paulie B]

This is after 15 hard kick on the old cylinder

[01blaster_freak]

What brand compression tester is that? And is it accurate?

[Paulie B]

Originally Posted by 01blaster_freak

What brand compression tester is that? And is it accurate?

Not sure of the brand. As far as accuracy I have no way of testing it. The reading makes sense to me with how it ran and how easy it kicks over now. Before I tore it down in preparation for the new jug, I couldn't even get it started. Consider the previous vids as baseline 'before' shots. RIP old 400 bring on the 426!

New setup:
426 big bore w/carbide bore
Flotek ported jug
Boretech machined head to match the big bore kit
Flotek lightened flywheel
V-force 3 reeds
DG pipe sectioned and welded to fit & DG silencer
38mm keihin AS

I hope to get 50 hp- might not sound like alot but this is from 79'...PB

[BigGreenMachine]

Clean! As are the welds on that intake. Nice work. 50 wheel hp is more then most 450's will ever see and with a chassis like the Blaster it'll feel like 100. LOL

Pulled the jug off mine today. Found out its sleeved. Going to give it a mild port and some fresh rings but not before replacing the crank seals/bearings. Oh boy...also hoping for the 50's in wheel hp.

[superevil]

Arent a lot of the 400 parts the same as the 490? Dude you should see if a 490 jug will fit!

[Paulie B]

Originally Posted by superevil

Arent a lot of the 400 parts the same as the 490? Dude you should see if a 490 jug will fit!

Not sure. I know the other 400's are different from mine. I also know the 465 and 490 have different cases. I got around $300 in work on the 400 jug so it's gonna be around for while.

[RumbleB]

Hey PB, I see you found my build-up. Man you have a lot invested in yours! How is the jetting coming with the new carb?

[CR480R]

Have you had any problems with the frame yet? I noticed you aren't using a front or top engine mount... Does it vibrate alot like like that? Does the frame flex when you jump or come out of a wheelie from not using a brace between the rear portion of the upper a-arm mounts?

[Paulie B]

Originally Posted by cr480r

Have you had any problems with the frame yet? I noticed you aren't using a front or top engine mount... Does it vibrate alot like like that? Does the frame flex when you jump or come out of a wheelie from not using a brace between the rear portion of the upper a-arm mounts?

It never bothered me before the big bore kit. Now that I have the kit installed you can definitely tell some vibes are going on. No problems with the frame at all. I have braces where I cut the frame, always did?