budget sv650 cafe racer

gt alex

Been Around the Block
Hopefully I will get some more dyno time 24/6.
The bike "seems" to be riding really well so incase not much tuning is needed I am making a list of things to test back to back e.g. air filter on and off, Plasma ignition leads on and off, balance tube and no balance tube.
All tests have been done so far with the TPS wound to full throttle position ...connect or leave as is.
Also the intake runs really cold maybe I could try it wrapped and not wrapped.

Are there other tests anyone can think of that may help?
Should I ask for results in Din HP or some other?
 

gt alex

Been Around the Block
The weather was very average this morning so rather than ride 1/2 hr to the dyno in rain I have rescheduled the test session and spent about 6hrs, making, fitting and wiring the TPS. Since the cdi was designed to work with the tps, I think it's the thing to do.
 

gt alex

Been Around the Block
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gt alex

Been Around the Block
Just got my e-marked bar end mirrors, so I pulled off the "better looking" 75mm mirrors and banged on the new legal sized mirrors.
On a custom bike it doesn't feel right but I don't want to attract the wrong attention
 

gt alex

Been Around the Block
Cold is good for an intake but despite running well once started, the weather here has gone single digits on the Celsius scale.
The result is wet plugs that won't fire up.
So I am going to wrap the centre of the manifold with silicone tape holding a wire wound resister against the manifold to heat it a bit on start up.
I've never done this before so comments are welcome.
And if it needs it, I will run a pipe from between the heads for warning once running.
Also I have ordered a 10mm Colortune kit to help get bottom end mixtures better, so I am looking forward to that arriving.
 

gt alex

Been Around the Block
I made a heater from some resistors and fitted it to a test pipe with silicon tape.
Result heater quickly heated to 40 deg C and was47 after 10 minutes the pipe temp increased 3 deg C after 10mins.
So 15 Minutes Should work well on my Intake.
Now I need sort how to fit it neatly to the Bike and turn in on and off without Ignition on.

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gt alex

Been Around the Block
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Got a Colortune today, it is magic.
I only used it on the rear cylinder the front is too awkward.
Its a spark plug with a window so you can see the colour of the combustion and check the mixture.
I put it on and idle was correct (not surprising there is a air corrector to get idle correct) from idle to 5000 was rich then from 5000 up was good all checked free revving on a stand.
So I adjusted the higher revs to be richer and then leaned the whole range to be correct.
Its such a good feeling when You can see the combustion colour as you build revs and it is all good.
The bike had been running well but I knew it needed tweaking and the Color tune made it so easy. Adjustment took only 15 minutes.
 

CarbsAndCylinders

Careful With That Axe Eugene
I had that impression that the Colortune could only be used for idle mixtures but you used it for higher rpms. I think I am going to get one.
 

Brodie

Gold Coast, Queensland
DTT SUPPORTER
Would be interesting to see the difference between the rear and front plugs after a mid throttle run now that you have the rear dialled in.
 

gt alex

Been Around the Block
Would be interesting to see the difference between the rear and front plugs after a mid throttle run now that you have the rear dialled in.
Bit hard to set it up behind the radiator even on the rear under the tank you have to hold the mirrored extension tube to maintain a angle to watch the combustion colour. I decided to watch plug colours after some use.
Also last (first) dyno run showed 44ft/lbs of torque so balance can't be too bad, we'll see what the plugs show.
But still a work in progress
 

gt alex

Been Around the Block
I was trying to source advice from the man that had the world patent (except us) and was the only legitimate manufacturer outside the U.S. Bob Henderson in Scotland.
I was saying, once I have this sorted best I can, I would like to try dual fish on the sv,
This is a extract of the relevant part of his reply,, Just thought I would share it as it may shed some light on why I am starting with the single throttle body.

"As to using "twins" there would have to be a VERY exceptional reason for doing so!
Rememer all our racing car successes and Championshiups were always on a "single".(from Nurberg Ring to Le Mans)
Most of the conventional reasons for using "twins" do not usually apply when using the "Fish" principle. Including some very awkward aero "set ups"."
 

gt alex

Been Around the Block
Since using my colortune and getting the mixture nice, I am more confident to ride some distance.
I have bought myself an action camera and chest mount the only down sides are the camera won't mount without the waterproof case so sound be be muffled, I have never used one before and don't know how to edit the footage.
All being well I will try it this weekend.
 

pidjones

Over 1,000 Posts
Since using my colortune and getting the mixture nice, I am more confident to ride some distance.
I have bought myself an action camera and chest mount the only down sides are the camera won't mount without the waterproof case so sound be be muffled, I have never used one before and don't know how to edit the footage.
All being well I will try it this weekend.
Believe me, the sound will suck anyway unless you have very good wind protection for it.
 

Brodie

Gold Coast, Queensland
DTT SUPPORTER
Don't go too far this weekend without a valid reason. Cops have promised to be out in force.
Sound on the chest mount cameras never turns out right. Always far too much wind noise.
 

pidjones

Over 1,000 Posts
There is a Youtube series by a lady out of The Netherlands called "Itchy Boots". She gets pretty good audio in her on-bike commentary, but of course isn't trying to record exhaust note. She has posted equipment lists several places. I've seen a recent video on here, I believe by Irk, that had good engine sounds and minimal wind noise. For a quick-and dirty wind screen, I've had success with fabric bandaid over the mic hole on a camera mounted behind my GoldWing windshield.

BTW, they make cases for the GoPro clones that permit mounting without the waterproof case. My waterproof case worked Ok helmet-mounted, but when I stopped after ~20 miles it started fogging inside. Glad I didn't take that cheap SJCAM underwater!
 

gt alex

Been Around the Block
Ok forget the video obviously I don' know what I'm doing.
While in lockdown I will do the big job that's left, the tank.
I bought a sporty Honda tank a while ago and have bee tossing up, use it or modify my tank?
Answer: I will do both, create a blend of both.
I can't envisage the result but I some goals
1 a flatter longer look
2 show the rear cylinder head
3 not sacrifice to much capacity

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