Chain and Sprocket Wear
This is so frustrating to see and could be total avoided by a simple maintenance
program of oiling the chain. See, if you oil it correctly it should never
need adjusting - if it does need adjusting then it's wearing because of
lack of oil or just straight out abuse. Don't wait until it's dry before
oiling it, oil it regularly before it gets dry and this won't happen, and
the bike will ride so much smoother.
It's not just chain and sprockets that are getting hammered here, there's
wheels bearings, swingarm bearings, gearbox......you can't afford not to
look after these things. Left much longer and this chain would have broken.
Come on people this is simple stuff!
Honda VTR250 on the Dynobike Dyno
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Honda VTR250 Dyno Graph
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"feel the difference"
Too Much is Never Enough
Well, sometimes it is...
Someone forgot to tell this bloke you need to remove the old oil before
you refill it with new oil.
It ended up with over 6 liters of oil and I was shocked and surprised
to find it blowing blue smoke on the dyno and less than 75 horse power
to begin with. I honestly thought something had let go until I discovered
how much oil came out of it.
We had to pull out the air box and to drain the oil out of it, replace
the air filter and of cause refill it with the correct amount of oil “3
liters”
Honda CBR600 overfilled with oil
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Honda CBR600 Dyno Chart
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"feel the difference"
New v's Old Chain and Sprockets
Look at the red line in the graph and note that it's very jagged.
This is because the chain has tight spots, meaning if you put the bike
on a stand and spin the back wheel checking the chain tension as you go
in some places its really loose and others tight. If it does that to the
graph I wonder what its doing to wheel bearings, swingarm bearings and
even worse gearbox final drive bearings. The most common cause is a total
lack or irregular oiling and maintaining.
Ducati 996SPS on the Dynobike Dyno
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Ducati 996SPS Dyno Graph
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"feel the difference"
Yamaha R1 with Faulty Exup
Heres what happens when the exup valve stops working correctly. It could
be a broken cable, seized valve or something jamming it or an electrical
fault. The cause of this one was that the servo motor was not opening the
valve fully, hence the first part of the rev range is fine but as the revs
creep up the power starts to drop off. Fixing this relatively minor fault
resulted in
an extra 30 horsepower!
By the way, this bike has 165,000 km on the clock, original engine.
Shows you what you can expect with regular servicing and some basic maintenance.
Yamaha R1 on the Dynobike Dyno
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Yamaha R1 with Exup fault
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"feel the difference”
Suzuki GSX750ESD
Working on older bikes can be very frustrating. The problem with this one
was that it runs fine until you hit the highway and cruse at 100 km for
5- minutes then it would feel like it was running out of fuel. We couldn't
simulate his problem on the dyno, however at the owners request we did
tune it because it was very rich and this may have been causing the plugs
to foul at 100 km. That didn't fix it!@#$%^^&
After a number of road tests we discovered the problem was turbulence
creating a low pressure area around the intake snorkel caused by the seat
buckling and leaving a gap, as shown above, when sitting on the bike. As
soon as we taped up the gap the problem went away.
Simple to fix..... really frustrating and time consuming to find.
"Feel the difference"
Suzuki GSX750ESD Seat Gap Turbulence
Suzuki GSX750ESD Seat Gap
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Suzuki GSX750ESD Dyno Chart
Suzuki GSX750ESD Dyno Chart
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