Motocross and Enduro Engine and
Suspension Tuning
Dynobike has been building and tuning high-performance fourstroke machinery
for many years. Allow us to apply our exptertise to your thumper - whether
it be a weekend bushbasher or a serious MX bike, we can make it better.
Often, much better! Check out our Workshop Services
We also have numerous products which will enhance your motocrosser or
enduro bike including a comprehensive range of Wiseco
Pistons
For information on how much more performance you may expect, and how
much it will cost, read this short article on a WR/YZF250
Hotup
Article on WR450 Engine Rebuild
Another article on a WR450 Hotup
DRZ400 440cc big valve conversion
DRZ450SM de-restricted
Well this is quite a straight forward job, however the carburetor on
these bikes are very difficult to get at and you need to pull it right
out to change the main jets so make sure you have plenty of time and tools
for the job if you attempt it yourself.
Apart from that it's all self explanatory if you look at the pics.
Once you have pulled out the intake snorkel mark out the top of the box
roughly 75mm square and cut it out with a hacksaw blade. remove the two
lower sub frame bolts so it can be tilted out of the way while you get
the carb. we finished up with a 150 main jet, needle in position 3 and
pilot air screw set at three and half turns out. This is only guide so
don't assume it will be right, make sure you check the air fuel mixtures.
As you can see from the graph the result's well worth all the effort.
"feel the difference"
What's
it cost* 
Jet kit - $145.00 optional (we didn't use one is this example)
Labour to cut out the box and dyno tune $450.00
The owner writes:
Nice work Dave, Bike feels all round snappier/stronger.
Seems to breath a little better.
Thanks again.
Sam
DR650 power upgrade
This is what makes my job so good Take a really gutless stock DR650,
remove the exhaust and fit a Staintune big bore exhaust system, remove
the air box restricter and drill some extra holes so it can breath. Then
a little jetting work on the dyno and voila! A rocketship!.
How can you not get excited about that.
Husky 510 EngineRebuild
No, it didn't blow up - this guy had the good sense to rebuild it before
that happened. So here you go this is hows its done:
Engine out, head and barrel off, quick measure to make such the barrel's
ok.
Pull the clutch assembly and flywheel off - you will need a special
flywheel puller for that. Then split the cases, pull the crankshaft out,
press it all apart and fit the new rod kit. Press the crank back together
to the correct web width which we measured before we started and then true
it all up to within .05 mm, and re-assemble everything in the reverse order.
Easy as that!
The owner did mention that the engine is now a little smoother so maybe
it was on the way out.
Honda CRF450 2008
Honda CRF450 2008 on Workbench
Honda CRF450 2008 on Workbench
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Honda CRF450 2008 Dyno Chart
Honda CRF450 2008 Dyno Chart
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Already had a healthy power curve, to clean up the bottom end and middle
range we fitted a JD jet kit for strong throttle response and mid range,
so you can be more aggressive with it. Often when this area is improved
it has a flow on effect to the hole package as seen in the power curve.
God I love this job!.
"feel the difference"
Honda CRF450 Jet Kit
Just like the road bikes, these things tend to run lean when you
change the muffler. We fitted a JD jet kit as per all the instructions.
You just cannot argue with the results - bottom end stumble is all gone
the bike's a lot more fun and easier to ride.
"feel the difference"
Honda CRF450 in the Workshop
Honda CRF450 in the Workshop
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Honda CRF450 Dyno Graph
Honda CRF450 Dyno Graph
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Race Reports
Danny Bray Race Report: Victorian Thumpercross
March 2005
Danny Bray Race Report: Arena X
Round 1 April 2005
Danny Bray Race Report: Gippsland
Centre Round 3 July 2005
Danny Bray Race Report: Monza
Park - Ballarat 18th June 2005
Vic Titles Round 3 -2005 results.xls
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Prices
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