main jets

[Sahtlinurk]

Hi,

Just received couple of main jets for my bike but they seem to be smaller than originals. head is only 6mm instead 9. etc.
apparently they are  "small" main jets. Didn't even know that there are two types. Now, will they fit or shall i send them back? 

cheers,
Lauri
1992 GS500E

[mr72]

the outside diameter of the head of the jet doesn't matter, strictly speaking, as long as the other dimensions are correct.

A 125 jet for example is 1.25mm diameter (the hole in the middle), as long as the needle goes into it and it's the right inside diameter, right height and depth, then it will work fine.

IMHO, Buddha will be around in a minute to correct me  . But I wonder how you got the wrong ones. Hopefully you didn't get Mk2 carb "mid" jets instead of Mk1 carb "main" jets.

[Sahtlinurk]

Got them from wemoto.com . I put my bike's model and year in and it listed me the jets i bought. after receiving them got suspicious and did a web search, discovered they are the smaller version of the two.

Lauri

[The Buddha]

For a 89-00 bike you need large round slotted mikuni (I think they're 8mm dia head).
The small ones are for 01 and later.
This is precisely why I sell jets, mains interchange and work fine with numbers making some sense. But pilots do not. You cant run 01+ pilots in a 89-00 carb and vice versa.
Cool.
Buddha.

[Sahtlinurk]

Ok. thanks.

Lauri

[J_Walker]

I have "large" mains in my 05 carbs and "small" mids. [+ 01 pilots however] the large mains look exactly the same.. maybe they aren't but they look no different, just bigger.

[The Buddha]

I have "large" mains in my 05 carbs and "small" mids. [+ 01 pilots however] the large mains look exactly the same.. maybe they aren't but they look no different, just bigger.

Oh wow, you've bass ackwarded it there. Most people end up putting the smaller ones in the 89-00 cos of late that's the common error the clueless parts Idiots seem to make.
I believe the hole dia in mm is what it signifies, so a 125 large round = 125 small round so its fine there.
Cool.
Buddha.

[J_Walker]

I have "large" mains in my 05 carbs and "small" mids. [+ 01 pilots however] the large mains look exactly the same.. maybe they aren't but they look no different, just bigger.

Oh wow, you've bass ackwarded it there. Most people end up putting the smaller ones in the 89-00 cos of late that's the common error the clueless parts Idiots seem to make.
I believe the hole dia in mm is what it signifies, so a 125 large round = 125 small round so its fine there.
Cool.
Buddha.

I knew better, I was just curious as to what the "large" ones where and what made them different. so I ordered them.  I used the ol' eyeball calipers to measure them out. lol I gotta get new ones anyway I got a little excited on the mains and run a bit rich, ironically enough I run lean on mids [causes a weird effect] and will be ordering smalls. since I'm just ordering singles and not whole packs of 4. lol

[The Buddha]

I knew better, I was just curious as to what the "large" ones where and what made them different. so I ordered them.  I used the ol' eyeball calipers to measure them out. lol I gotta get new ones anyway I got a little excited on the mains and run a bit rich, ironically enough I run lean on mids [causes a weird effect] and will be ordering smalls. since I'm just ordering singles and not whole packs of 4. lol

Meeh, Potato, main jet same thing. Now the mids are also main jets (small round slotted - just smaller holes) but I've never managed to find 62.5's in that. 65 works OK but sometimes its too rich but you can always cover that by not putting the washer under the needle.
Cool.
Buddha.

[J_Walker]

I knew better, I was just curious as to what the "large" ones where and what made them different. so I ordered them.  I used the ol' eyeball calipers to measure them out. lol I gotta get new ones anyway I got a little excited on the mains and run a bit rich, ironically enough I run lean on mids [causes a weird effect] and will be ordering smalls. since I'm just ordering singles and not whole packs of 4. lol

Meeh, Potato, main jet same thing. Now the mids are also main jets (small round slotted - just smaller holes) but I've never managed to find 62.5's in that. 65 works OK but sometimes its too rich but you can always cover that by not putting the washer under the needle.
Cool.
Buddha.

62.5s are sold by JetsRUs [however i'm still salty about the lack of disclaimer originally years ago.- its there now that all I'm gonna say]