XS 650 Yamaha racing crankshaft
by Chris Applebee Engineering
we specialise in dynamically balancing & OVERHAULING all motor bike crankshafts
If you have any questions please do not hesitate to ask.
on 01268 776642 or email email@example.com
Thanks for looking
Tips for rebuilding the CR 250 crankshaft
Rephased XS650 with Jack's D-Shaped Intake Ports!
700cc with JE Pistons, 277 Rephased Crank, Early Camshaft, 277 Pamcopete
Ignition and all the normal goodies we do to an engine at Hugh's HandBuilt.
All but 1 exception. We spent the last few months with "Jack" from the
forums, and he's taught us a TON of new ways to get some flow into the
heads on these engines. This particular engine has had the intake runners
"D" Shaped, with a raised floor and some healthy 2nd turns, and slightly
shrunk in diameter to raise velocity. Very special thanks to Jack for
taking the time to hang out in the shop with us, and show us a few tricks!
Balancing a Jaguar E Type crank at Classic Jaguar in Austin, Texas
Crankshaft Truing Procedure Honda ST90 CR KX YZ RM CRF YZF Crank
This video shows how to check the trueness of a single cylinder crankshaft
and what to do if it is outside the manufacture spec. The process is the
same for 2-stroke and 4-stroke crankshafts.
This demonstration was filmed in the lab at Western Iowa Tech Community
College Motorcycle and Powersports Technology Program. If you would like
more info on the program feel free to contact the instructor @ 712-274-8733
ext 1204 or email firstname.lastname@example.org or email@example.com
Static crank balance
Testing static crank balance on a Honda CR 500 after some balancing is
done. The steel bar replacing the piston does weigh 54% of piston.
cr 500 crankshaft
Ken OConnor Racing building a CR500 crankshaft
270 Degree Rephased XS65 - Hugh's HandBuilt
Thats right folks, we finally built a 270 Degree Rephased XS650 Engine
Ok, here comes the flood of emails, questions, etc... So I'll just quote
Wikipedia for the reason to rephase an OEM Firing Pattern of 360 (which is
the stock XS650 engine configuration) to a 277 or 270
"The classic British parallel twins (BSA, Triumph, Norton, AJS & Matchless)
had a 360° crankshaft that, compared to a single, gave twice as many
ignition pulses, which were evenly spaced.
The Yamaha TRX850 had a 270° crank that allowed a more regular firing
pattern than a 180° crank, and less regular than a 360° crank. This
configuration has the best possible secondary engine balance for a parallel
twin; its Exhaust sound and power
delivery is identical to a 90° V-twin." - Think Ducati or Suzuki SV Series
While we do a TON of 277 engines (it's the most cost effective rephase for
the XS650) this one is 270 degrees. I've always wanted to build one. It
requires a specially made center pin for the crank ($$$$$) and 2 donor
cranks to build a single 270 crank. Then the camshaft and ignition must
also match the new firing order of course.
What you see here, is a 750cc 270 Degree XS650 Engine, using JE Pistons,
our HHB D-Shaped Ported Head, 5th Gear OD, HHB 6 into 7 Clutch mod, 5th
Gear OD, HHB Oil Cooler and all the other little tricks we do at Hugh's
I hope you enjoy it. Go find our Blog, and check out the other cool things
you can do with these bikes. They are a blast to own, mod and work on.
Red Hot Rephased XS650 Engine Hugh's HandBuilt 277
This engine came to us as a bit of a problem engine really. Customer
brought it to us, as another shop had tried to build it, and looks like
they were simply in over their head. Things were shimmed wrong all over,
the clutch was assembled incorrectly, the valves were hitting each other,
the cam was too aggressive, shift shaft was binding in the cases, etc...
We tamed it down a bit and brought it to life. Hugh's HandBuilt 277 Crank
and Camshaft, oversize valves, 5th gear OD, all of our clutch tricks
including a "7 into 6" HHB Clutch swap, 750cc Heiden Tuning Big Bore,
Pamcopete 277 Ignition, HHB Permanent Magnet Alternator swap, and of course
all of our standard rebuild tricks - enjoy and thanks for watching.
PS - don't mind the oil leak from the oil filter cover, the owner has a
custom oil cooler that will be installed there - so I just used a junk
cover here for initial fire.
How to Balance internally & externally balanced Crankshafts (Crank)
Anthony @ DIYautotech here showing you how I learned to balance a crank.
We have ASE Certified professor demonstrating how to balance both
internally & externally balanced cranks.
If you have any questions please leave a comment below.
This is being done at Saddleback College Automotive Machine Shop.
Saddleback offers and excellent Automotive program that can be completed in
just about 2 years. If you wanna get into the industry & have as much fun
learning as I have...then you should come on down and check out our shop!
Engine Building with Rog - Hone and Measure - HD
Here are some engine building videos from my old man, Rog. He explains the
honing process and how to measue with a dial bore gauge. We are working on
a Ford small block (351 Windsor) with a .030 over-bore and it wll have a 4"