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post #21 of 201 (permalink) Old 02-24-2009, 04:48 AM
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I used tiny brass washers to raise the needle on a Harley I had a few years ago. From memory, they were 0.5mm (0.020"") thick.

They are available from any hardware shop...

Cheers,

Roden
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post #22 of 201 (permalink) Old 03-19-2009, 06:56 PM
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One wee update following some full power, max speed runs is that on my bike i found that decelerating from 130+ mph down to 40mph and then rolling the throttle back on caused the engine to buck and feel like it was missing on one or more cylinder.

There`s no need to panic as all you need to do if you do find this happening is to turn the pilot air mixture screw out another half turn so it`s then 3 full turns out and you`ll be all systems go with no hesitation at all. I tried this today and no matter how hard i tried i couldn`t get it to do it again. Oh! The hardship of bike testing
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post #23 of 201 (permalink) Old 03-24-2009, 04:21 PM
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Right that's it I'm getting a set....well I'd already made my mind up but that has confirmed the idea :-)

Several things will happen :

1. better MPG
2. Rejet the carbs to allow decibel killers to come out of the pipes
3. All the other stuff aje has just mentioned

Anybody want to buy a set of Mikunis this winter ?????
Well I just bagged a set..I'd been outbid on a few sets over the last few months or so..!! These are 15 thou miles old off a Thunderbird Sport. Just in time too because the Sprint is playing up and I think it's carbs again, so the plan is to get the old Mikuni's off the S3 onto the Sprint and get these onto the S3...Tempted to do the Pod set up Matt descibes..?

Ah well got a little time to decide
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post #24 of 201 (permalink) Old 03-24-2009, 04:52 PM
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so the plan is to get the old Mikuni's off the S3 onto the Sprint and get these onto the S3...Tempted to do the Pod set up Matt descibes..?

Ah well got a little time to decide
Time to source a different set of airbox-to-carb rubbers, keihins are smaller, and the mikuni clamps are too large if you're going to use the T3 airbox which is the minimum required to get them running halfway unless you embark on pods. As I learned recently (I'm ntb sometimes) that the airbox plays a significant role in the grand scheme of things. I had them on for a test drive sans airbox and the it was just terrible, would barely run.

Something to be said for keeping the number of new variables small to sort out changes.

Interesting to watch for success stories on these carb and filter swaps as there's always something to learn

Last edited by djw; 03-24-2009 at 06:03 PM.
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post #25 of 201 (permalink) Old 03-24-2009, 05:20 PM
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Time to source a different set of airbox-toi-carb rubbers, keihins are smaller, and the mikuni clamps are too large if you're going to use the T3 airbox which is the minimum required to get them running halfway unless you embark on pods. As I learned recently (I'm ntb sometimes) that the airbox plays a significant role in the grand scheme of things. I had them on for a test drive sans airbox and the it was just terrible, would barely run.

Something to be said for keeping the number of new variables small to sort out changes.
A lot of people say the same thing about the airbox yet matt.speedtriple has been successful with his pod conversion. I am going to have a crack at it, if it doesn't work, I can always revert to original!

Good score btw Mot

Cheers,

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post #26 of 201 (permalink) Old 03-24-2009, 05:42 PM
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When you can get the three pods for £24 from most bike shops then it`s got to be worth a go as it saves so much hassle getting the carbs on and off.

As for setting mixture screws then all you have to do is to pop off the centre pod, loosen off the intake rubber clamps, slide the carbs back a bit and then tilt forward and there they all are ready and waiting for you.

No stress, no hassle and you even get to keep the skin on your knuckles

Give it a go Mot as i`d be interested to see what you think of my input. :

By the way Mot, cheers again for the shock and although still a bit soft then it`s so much better than that other saggy arsed new one i`d got. :
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post #27 of 201 (permalink) Old 03-25-2009, 02:28 AM
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No worries Matt glad I could help ;-)
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post #28 of 201 (permalink) Old 03-25-2009, 08:08 AM
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Hey Matt, your posts are great and very informative. Thanks! In my case the timing couldn't be better. I've got a set of Keihins in the mail and I will likely be fiddling with them over the next week or so. I'm running Micron exhausts, 3 into 2, as in the picture on my Trident, with pod filters. Do you think I would need the 152 mains or would 140 be ok? Also, did you use the same for all cylinders, or was the center different? Thanks in advance
Bernie

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post #29 of 201 (permalink) Old 03-27-2009, 05:04 AM
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Well I just bagged a set..I'd been outbid on a few sets over the last few months or so..!! These are 15 thou miles old off a Thunderbird Sport.
Hi Mot,

I have also got hold of some Keihin CVKs from a 'classic' model. Mine are from a Legend, but I believe they are the same as the Thunderbird Sport. I have been thinking about fitting them to my Sprint, and done some "research" prior to fitting them in the future. Without modification, they are not suited to the cams fitted in the 98ps engines, etc....

There are 4 internal parts that are different, as standard. The main jet & pilot jet, as we can guess, and the Vacuum Piston & its' Spring:
- The vacuum port in the piston is different, increased from 2.5mm to 3mm. So by using a 3mm drill bit (eg. Dynojet Mikuni kit style) I hope to avoid buying new vacuum pistons.
- I am guessing that the Spring has a different rating, and so I plan to buy these prior to fitting (part# T1241021).

I am some time off doing this upgrade (other priorities), but hope my "research" helps you.

This is an excellent post by Aje, and especially with the jetting information from Matt.

Lechyd da,
Geoff
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post #30 of 201 (permalink) Old 03-27-2009, 07:37 AM
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Cheers Geoff...

The part numbers will come in very useful ta. Bernie also gave me a heads up on the drilling and spring, makes you wonder how many people are just bunging them straight on ??? Carbs have turned up yesterday and look in good nick...

I would like to go for pods I think and will hopefully kill 2 birds with one stone on the re jet, I've now got the decibel killers out of the Scorpions and would needed to have re jetted anyway.

Matt is the drilling, spring thing part of your set up too ??

With any luck by the time this thread has run it could make a good point of reference for the CVK's
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