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Go Back   FZ1OA Message Board > FZ1 & Fazer Owners Association > Exhausts, Carburetion & Performance > Gen 1 Exhausts, Carburetion & Performance

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Old 01-02-2020, 12:57 PM   #1
oldjeep
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Identifying modified carbs

Just ordered a rack of carbs off ebay because I am tired of trying to figure out my #4 carb issue. Since I have no idea what the history of these carbs is - is there any easy way to identify if they have been messed with? (drilled in any way) I'm going to assume that if the air screw covers are still there then I am dealing with stock carbs.
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Old 01-02-2020, 06:45 PM   #2
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On other bike forums, I have seen folks supplying part numbers and sources for the plugs. They're not hard to find in the electrical and electronics suppliers. Some people like to replace the plugs after they get a carb adjusted to their preference.
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Old 01-02-2020, 07:30 PM   #3
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I don't care about the plugs, just want to be able to figure out if the carbs have been messed with in terms of "ivanizing" or anything else that might be expecting airbox or exhaust mods. From the pictures they look super clean, but the carbs are coming from a dismanteler and the only thing I can tell from the source bike pic is that it appears to be a skunk with an aftermarket muffler. They will be here next week.
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Old 01-02-2020, 10:05 PM   #4
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If the air screw brass covers are still in place, good chance the carbs have not been altered.

Ivan uses jet needles that can be adjusted by the circlip on the needles. Five positions for adjustments. O.e.m. jet needles have only one indention near the top of the needle.

Hope the above helps you.

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Old 01-03-2020, 04:00 AM   #5
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Thanks, that does help. Hope they are as clean as they look in the pictures when they get here Wed.
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Old 01-03-2020, 05:14 AM   #6
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If I remember correctly the dynojet jet kits didn't require the air screw covers to be removed.

Like any used carb, its best to open them up and see what size jets and needles are in it, and a new oring kit.
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Old 01-08-2020, 02:04 PM   #7
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They showed up today. Can't really tear into them until tomorrow night but off the bat I notice 2 things.
1) someone drilled a bunch of holes in the air box
2) there is a fat rubber line on the bottom between #2 and #3 that goes to a T fitting that my carbs do not have. (not the little coolant lines)
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Old 01-08-2020, 09:56 PM   #8
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Those are for California models. They go to a charcoal canister to catch fuel evaporation.



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Old 01-09-2020, 06:45 AM   #9
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Quote:
Originally Posted by Pat Glenn View Post
Those are for California models. They go to a charcoal canister to catch fuel evaporation.



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Thanks - so they can just be removed? Or need to be capped? Any other CA carb special things I should know about?

Should be able to tear into them tonight. based on what I'm seeing so far I'm expecting they have been modified.
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Old 01-09-2020, 07:31 AM   #10
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It's for fuel vapor. Vent it to atmosphere. Attach hose to that open fitting and run it down near the swingarm.

Nothing else you need to know about. The differences for Cali bikes were that canister and its associated hoses, check valve, different gas tank (with the extra opening to accept any reclaimed fuel vapor), and a sticker.
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Old 01-09-2020, 05:22 PM   #11
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Took the #4 (new) carb apart tonight and aside from being so gunked up that the needle was stuck - it seems to be in decent enough condition in terms of the parts I want. Mainly I just wanted the carb body, slide and float so I can swap all the new rebuild parts from the old #4 carb to this one and see if that somehow magically solves the rich number 4 issue. Of course I was out of carb cleaner, so the rest of the operation will have to wait until tomorrow. Maybe if I'm lucky I'll find the needle spring that launched itself somewhere in the shop. If not I've got 4 spares ;)
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Old 01-12-2020, 04:15 PM   #12
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Put it all back together today and fired it up. Cylinder 4 is now running a bit hotter now than the other 3 but i still need to sync them later when I figure out how to vent the shop so I don't gas myself out. Pretty happy since cylinder 4 has always been the cold/rich one.
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