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Author Topic: Cheap 'Pod' filters - why you shouldn't - Public service posting  (Read 48631 times)

Offline manas

  • Posts: 119
Thanks for the advice. Will do.

Offline crazypj

  • Posts: 12487
  • Split personality, I fake being smart
Yep, join the XS650 Garage on proboards, they have a complete section on the 650, you'll just have to make allowances for different sized carbs on triple but the information will work on Mikuni CV
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline manas

  • Posts: 119
Yep, join the XS650 Garage on proboards, they have a complete section on the 650, you'll just have to make allowances for different sized carbs on triple but the information will work on Mikuni CV

Went ahead and did that. Hopefully someone will steer me in the right direction once my pods get here. Also thinking about sending the carbs off for ultrasonic cleaning.

Offline teazer

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  • Posts: 8205
I have cleaned a few sets of carbs for guys on DTT.  When you get a quote, why not see if I can match it or beat it.  :)

Offline manas

  • Posts: 119
I have cleaned a few sets of carbs for guys on DTT.  When you get a quote, why not see if I can match it or beat it.  :)

I'll definitely message you, teazer. Would be more than happy to have an experienced DTTer do the Job.

Offline harrydahl

  • Posts: 26
If you have a look at the original carburettor incorporating the principle of constant depression, the SU, you can see that it has a separate channel from under the piston to the relatively calm air inside the air filter. On the Mikuni, on the other hand, that channel ends right inside the carburettor throat, in the turbulent air entering the motor. I can imagine that this makes the Mikuni a lot more sensitive to modifications in the inlet.
Yamaha XS650, 1976

Offline manas

  • Posts: 119
If you have a look at the original carburettor incorporating the principle of constant depression, the SU, you can see that it has a separate channel from under the piston to the relatively calm air inside the air filter. On the Mikuni, on the other hand, that channel ends right inside the carburettor throat, in the turbulent air entering the motor. I can imagine that this makes the Mikuni a lot more sensitive to modifications in the inlet.

Hi Harry, thanks for the input. I see that you've built a beautiful XS650. What kind of carbs are you using on that and how has your experience been with fitting pods on it..

Offline harrydahl

  • Posts: 26
Thank you, manas!
It has the original Mikuni 38's, with some no- name pods, when I bought it. Changed them to velocity stacks from Dime City, but I am a bit concerned that the stacks make the Mikuni's port holes a bit shrouded. Maybe I will try and attach a short pipe between the Mikuni's reference hole and the bell mouth, to get undisturbed air into the hole. Later, I plan to put the velocity stacks inside Uni filters to get better air filtering
Yamaha XS650, 1976

Offline manas

  • Posts: 119
Thank you, manas!
It has the original Mikuni 38's, with some no- name pods, when I bought it. Changed them to velocity stacks from Dime City, but I am a bit concerned that the stacks make the Mikuni's port holes a bit shrouded. Maybe I will try and attach a short pipe between the Mikuni's reference hole and the bell mouth, to get undisturbed air into the hole. Later, I plan to put the velocity stacks inside Uni filters to get better air filtering

Interesting! I'd like to know what happens after your modifications..

Offline harrydahl

  • Posts: 26
Was thinking about doing some modifications to the Mikunis, but before that I decided to do some testing. I attached the carburettor to a vaccumcleaner. The hoover sucked air through the Mikuni and the flow was enough to lift the slide all the way up to the top. Then I tried both with and without the velocity stack attached, but there was no difference, so I'm leaving the carbs as they are, for the moment. However, I did modify the Dime City velocity stacks, to the rid of them shrouding the slide hole in the carb intake.
Yamaha XS650, 1976