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#567966 - 10/16/14 4:10 pm Mikuni Tuning on a Trident  
Joined: Aug 2012
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gzrglyde Offline
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Does anyone have a good method for tuning Mikuni carbs on a trident? The "directions" that come with the new carb kit (from MAP) is not very good. I seem to be having issues with the air/fuel adjustments.

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#568006 - 10/16/14 8:22 pm Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
Joined: Sep 2009
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SEATTLE GS Online content
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SEATTLE GS  Online Content
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SEATTLE WA
what are the MAP jets? and carb size

#568033 - 10/16/14 11:26 pm Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
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gcooperlll Offline
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I would find a smart engineer, buy him a large bottle of exotic rum and borrow his colortune.


Cooper
#572699 - 11/17/14 8:39 pm Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
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kevin roberts Online content
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kevin roberts  Online Content

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get a uni syn as well. the two together are unbeatable



Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#572736 - 11/17/14 11:07 pm Re: Mikuni Tuning on a Trident [Re: kevin roberts]  
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shel Online content
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shel  Online Content
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Originally Posted By: kevin
get a uni syn as well. the two together are unbeatable



I bought one second hand but have never used it manly because I'm not sure how.
I understand that this tool is used to sync carbs but all the instructions I've read describe using the throttle stop screws to adjust, this is fine to get all carbs in sync at idle but what about above idle?


When given the choice between two evils I picked the one I haven't tried before
#572881 - 11/19/14 2:08 am Re: Mikuni Tuning on a Trident [Re: shel]  
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DavidP Offline
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Gnashville
Originally Posted By: shel

I bought one second hand but have never used it manly because I'm not sure how.
I understand that this tool is used to sync carbs but all the instructions I've read describe using the throttle stop screws to adjust, this is fine to get all carbs in sync at idle but what about above idle?

Not that difficult with a triple. Raise the 'idle' using the throttle-stop bolt on the manifold, then adjust individual carbs with the adjuster on top of the manifold.
It gets tricky with twins. I tighten the tension screw on the throttle until it will stay in position at higher throttle openings and adjust the cables. After that I adjust the idle-stop screws. You will need to adjust the screw on the back of the UniSyn so the little bead is in the center at each throttle setting.
That said, this will only get your throttles synched, won't affect the mixture. Good luck with the Mikunis. I've had mine for a couple of years and finally got the set up right. At least you are starting with what MAP thinks is close.
BTW: I have the same question about the ColorTune. How the heck are you supposed to run down the road at WOT, or even half throttle, and peer down to see what color your combustion is?


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
#572894 - 11/19/14 5:22 am Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
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kommando Online content
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Scotland
Quote:
BTW: I have the same question about the ColorTune. How the heck are you supposed to run down the road at WOT, or even half throttle, and peer down to see what color your combustion is?


You don't, it does not have the heat transfer properties of a proper spark plug and your engine will overheat, it can only be used with the bike stationary.

Here are the instructions in colour.

http://www.carbtune.co.uk/Images/Colour%20Chart%201.jpg

http://www.carbtune.co.uk/Images/Colour%20Chart%202.jpg

http://www.carbtune.co.uk/Images/Colour%20Chart%203.jpg

http://www.carbtune.co.uk/Images/Colour%20Chart%204.jpg

#573042 - 11/20/14 3:22 am Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
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DavidP Offline
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Gnashville
Just as I suspected, too much money for a gizmo which will tell me what my ears have already revealed.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
#573134 - 11/20/14 7:27 pm Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
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shel Online content
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shel  Online Content
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ohio
I was out in the garage last night and I was looking at my uni syn and it seems the adjuster screw is missing so it's not much good if I can't find a replacement.
I also bought a colortune a couple years ago but haven't used it yet. My Bonnie has Mikunis on it and once dialed in don't require a lot of attention and my Trident has ran well since first start up so I haven't messed with the carbs much.
Both bikes will get a good going over in the spring, I may play with the carb tuner toys then.


When given the choice between two evils I picked the one I haven't tried before
#573165 - 11/21/14 12:31 am Re: Mikuni Tuning on a Trident [Re: shel]  
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kevin roberts Online content
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the unisyn and colortune both work only for setting final idle mixture up to 1500 rpm or so on a twin or triple. if you're not idling your bike then they won't do anything important for you.

shel, i'm not sure what adjuster screw you're talking about. on the unisyn, you set the idle as best you can using the mixture and throttle stop screws, then set the unisyn on the carb and screw in the venturi wheel until the floating bead lines up with one of the lines in the tube. then you set it on the other cylinder and mess with the carb screws until the bead sits at the same height. if the bike's idling too high, turn down both throttle stops and balance again. all it does is balance the carbs, but it does it very precisely.

the colortune is also just a fine adjustment for idle. try to ride with it and it will blow out the middle.

you don't need them to tune a bike, just like you don't need feeler gauges to set the valves. but they make it quick and exact, and let me do a better job.


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#573166 - 11/21/14 12:38 am Re: Mikuni Tuning on a Trident [Re: kevin roberts]  
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kevin roberts Online content
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if you're tuning the mikunis at higher rpms and loads, then the old pointer-tape-on-the-throttle and plug chops are what i do. i,ve run 32 mm mikunis on my triumph for ages, and they respond well to tuning


Into the distance a ribbon of black
Stretched to the point of no turning back
A flight of fancy on a windswept field
Standing alone my senses reeled
A fatal attraction is holding me fast how
How can I escape this irresistible grasp?
#573260 - 11/21/14 6:24 pm Re: Mikuni Tuning on a Trident [Re: shel]  
Joined: Oct 2008
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DavidP Offline
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DavidP  Offline

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Gnashville
Originally Posted By: shel
I was out in the garage last night and I was looking at my uni syn and it seems the adjuster screw is missing so it's not much good if I can't find a replacement.

My bad, there is no adjuster screw as such. To adjust the opening you screw the dome-shaped thing in the center in or out.


Stepping on others doesn't make you stand tall.

71 A65L "Zelda"
92 BMW K100rs "Gustav"
#573262 - 11/21/14 6:36 pm Re: Mikuni Tuning on a Trident [Re: gzrglyde]  
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shel Online content
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shel  Online Content
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ohio
On the cross bar piece across the top the center is threaded so I thought something was missing. I'll have a closer look at it next time I'm out there.
I plan on playing around with the uni syn and colortune when it warms up.


When given the choice between two evils I picked the one I haven't tried before


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