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New Carbs

Started by ben2go, March 06, 2008, 07:32:21 PM

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scottpA_GS



YES !!!

  :icon_mrgreen:


Let us know what you think of em  :icon_mrgreen:


~ 1990 GS500E Project bike ~ Frame up restoration ~ Yosh exhaust, 89 clipons, ...more to come...

~ 98 Shadow ACE 750 ~ Black Straight Pipes ~ UNI Filter ~ Dyno Jet Stage 1 ~ Sissy Bar ~


ben2go

I'm taken donations to purchase them.Should I put you down for the full amount?  :laugh: :laugh: :laugh: :laugh: :laugh: :laugh:


I'm just aggravated with a set of stock carbs that are giving me a problem.I'm was looking for info on the stock carbs.I came across these and started thinking about tax time next year. :cookoo:
PICS are GONE never TO return.

ohgood

i've just purchased 2 sets of stock mikuni's for a total of $140 from gstwins members. one set is one my bike and running flawlessly for the moment with the only change being 150 mains.

i still haven't torn into my original (on the bike) set of carbs to find out what the problem was. i'm guessing a combination of dynojet + some crevice full of junk.

bug the members if you want a set cheap. :)


tt_four: "and believe me, BMW motorcycles are 50% metal, rubber and plastic, and 50% useless

spc

Yeah, but them there are flatside carbs.   That what them crazy race junkies use :icon_rolleyes:  no vacuum= no having to worry about torn diaphragm and other shaZam!.

dgyver

Those are not flat slides. They are smooth bores.

I sold a set for $275. Recently I snagged a set off of ebay for $100.

Common sense in not very common.

ben2go

PICS are GONE never TO return.

dgyver

If you can get them cheap enough.
Common sense in not very common.

ben2go

Quote from: dgyver on March 07, 2008, 12:35:29 PM
If you can get them cheap enough.



Got'em on my watch list.
PICS are GONE never TO return.

ohgood

can anyone enlighten me as to why the 'smooth bore' or 'side whatever' are better than the stock mikuni's since a few of you really know this stuff ?



tt_four: "and believe me, BMW motorcycles are 50% metal, rubber and plastic, and 50% useless

ben2go

Quote from: ohgood on March 07, 2008, 04:17:42 PM
can anyone enlighten me as to why the 'smooth bore' or 'side whatever' are better than the stock mikuni's since a few of you really know this stuff ?





Below is a quoted anwser from above.


Quote from: spcterry on March 07, 2008, 09:08:57 AM
Yeah, but them there are flatside carbs.   That what them crazy race junkies use :icon_rolleyes:  no vacuum= no having to worry about torn diaphragm and other shaZam!.
PICS are GONE never TO return.

ohgood

so it's just -another- carb, not a 'better' carb ? ok, cool, i can dig that. tanx.


tt_four: "and believe me, BMW motorcycles are 50% metal, rubber and plastic, and 50% useless

dgyver

Mechanical carbs do not have the vacuum lag as CV carbs do. More fuel is delivered faster. More responsive. Another advantage of flat slides is that they do not
have a throttle butterfly to impede airflow at full throttle.

The disadvantage to this is that they are much less tolerant of inappropriate throttle movement. If you quickly give full throttle at low rpm, the engine may bog where CV carbs would cope.
Common sense in not very common.

lamoun

they do not have a throttle butterfly, as dgyver already said above, but you control the slide position with the throttle cable.

ohgood

cool, so they're less forgiving of newbie mistakes. got it. thanks for the explanations :)


tt_four: "and believe me, BMW motorcycles are 50% metal, rubber and plastic, and 50% useless

ben2go

when I last checked they were $256 and some change.  :o I wasn't even expecting them to hit $50.
PICS are GONE never TO return.

dgyver

Are you serious? 36mm flat slides are the most sought after. Never seen them under $300.

I pickup a pair of Mikuni 36mm flat slides from a Polaris sled for $60. Just need to figure out what would need to be changed to run straight gasoline instead of a oil/gas max.
Common sense in not very common.

ben2go

Quote from: dgyver on March 08, 2008, 04:39:06 PM
Are you serious? 36mm flat slides are the most sought after. Never seen them under $300.

I pickup a pair of Mikuni 36mm flat slides from a Polaris sled for $60. Just need to figure out what would need to be changed to run straight gasoline instead of a oil/gas max.


I thought that 2 strokes have the same carbs as 4 strokes.The difference I was thinking, was that a 500cc 2 stroke would require a little more fuel because of the oil/gas mix.I really shouldn't speculate on this be cause I've only owned one 2 stroke,a 250cc Honda Odyssy.A couple pieces of lawn equipment,also.
PICS are GONE never TO return.

dgyver

It would be nice if all I had to do was swap jets. The main concern if the emulsion tubes are different sizes but they can be changed.
Common sense in not very common.

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