would fcr's fit with this setup ?

[HWB]

good day

heres the deal, bike is a 1992 gsxr with the original 1127 shortblock and do.t head ported and everything, bike came originally with the 40mm carbs but now im running mikuni 38mm rs with no issues, the other day i removed them for maintenance and went to install the original 40's but they wouldnt fit, they hit the frame under the tank, problem is ihave the carb boots port matched with the head, they would probably fit if i put the 40mm boots on but that would be a big mismatch and it would probably run like crap,

 

question is : since my rs fit perfectly without hitting the frame, would the fcr39 clear ? are they taller ? im asking before dropping 1200$ on carbs that wont fit and cause a huge headache.

 

cheers

[spiderpig]

Why not stick with the rs38s? 

The dot head has a steeper inlet track so the stock carbs can hit the fuel tap. I haven't heard of them hitting the frame. 

[HWB]

what size stock carbs, my40mm hit the frame

[Duckndive]

41 minutes ago, HWB said:

what size stock carbs, my40mm hit the frame

its not carbs its engine 

the dot head is from a 750 so more room for the carbs under tank and frame

dot head on 1100 carbs hit things 

and FCRs are taller than RS carbs they also tilt back as well 

 

Edited September 22 by Duckndive

[HWB]

my 38 rs barely clear, so you reckon the fcr wont fit since theyr taller ?

[Duckndive]

4 minutes ago, HWB said:

my 38 rs barely clear, so you reckon the fcr wont fit since theyr taller ?

no idea just pointing out the difference 

maybe google FCRs and see if there are any clues or dimensions 

[Upshotknothole]

Pretty sure the dirt bike carbs are the same size as what gets used on the GSXRs. The dot heads move the carbs up more than any other head, and those stock 40mm CVs are huge, as well as being a pain in the ass to jet without an airbox.

If you know anyone with a dirt bike with an FCR carb, see if you can borrow it and test fit it.

 

Also a quick search gave me this photo. There's a fair amount of clearance on the side, but can't see how much clearance there is around the petcock or throttle cables.

[HWB]

thanks for the pic but are you sure that bike has a d-ot head on ?

[Upshotknothole]

6 minutes ago, HWB said:

thanks for the pic but are you sure that bike has a d-ot head on ?

Nope, didn't say anything about it having a dot head on it. You'll need to measure how much taller your dot head is vs a standard head. Top of the intake to the top of the carb should be enough to figure it out. Or, borrow an FCR off a dirt bike and see if it clears.

Can you post up a photo of how much clearance you have with the RS carbs on the bike?

Also, I'm pretty sure the FCRs won't fit your intakes you have port matched for the RS carbs. FCRs are bigger.