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Discussion Starter · #1 · (Edited)
My needle jet arrived from the US of A today so I stripped the carb down and cleaned it.
I installed the neeedle and jets but there is a problem.
The slide will not close all the way down and I have had it apart but cant seem to suss out whats up.

If you look at the following youtube video and fast forward to 10:00 ,you can see on the carb that his slide goes all the way to the bottom but mine stops at about 6mm even if I take the needle out again.
Any suggestions coz my head is starting to ache and it time to call it a day.:clown::clown::clown:


https://youtu.be/mAuV6_Bp8IQ

It all went together easy enough.:thumbup:
 

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Discussion Starter · #3 · (Edited)
Hey up mate,
I tried it both ways round with the vacuum release plate but as you can see in the video the the slide drops all the way down so the chamber is 100% closed and mine wasnt.
I did a bit of bodging on the bracket that holds the slide in place (Nr 16) by holding the TPS in place and twisting the bracket down a bit so it closes a bit more.
Only problem is now it wont snap shut and feels a bit notchy but it can be closed with the return cable.
I will have another look at it tomorrow in daylight and see if I can suss it out :thumbup:
What did you use for a crankcase breather?
My $32 velocity stack (which couldnt be bought in europe) is being held up in customs (7 days now) and they told me I have to pay £5 import tax which is ok but I have to pay a £15 handling charge and I have to walk to the bleeding post office to collect it.
I thought the idea of postage was that they bring it to your home.;)
 

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I got an FCR-MX carb off a CRF250F '07 model.
It came with the original insulator with an ID of 48mm so I decided to use that in my fix.

Here it is, the custom made insulator. This is a plastic part and will need to be remodeled slightly, but is near perfect.

I will make these out of aluminium and they will bolt right onto the cylinder head using the FCR's original insulator

P1020054.jpg P1020057.jpg
 

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Hi RR , that looks like a neat solution you have there , i like it better than how i have mine fitted
i managed to shoehorn my carb in by removing most of the casting that holds the return cable , filing a groove into the remainder of the casting to position the cable in and fabricating a retaining bracket that's screwed into the hole where the plastic cover used to mounted , see blurry photos

http://

http://



as you can see its a very tight fit












 

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my original method of mounting the carb was with this homemade thingy which clamped up using the original crf rubber , i made it so it would cant the carb slightly to the left and position it slightly lower , worked pretty good i only switched back to the original boot because i thought it would look tidier

http://


http://






 

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Discussion Starter · #9 ·
My carb is broken.
The black plastic arm on the pumper ( nr 65) that connects to the metal pushrod that operates the diaphram is broken and you cant seat the the rod into it so when I move the slide up and down, there is no movement in the pumper.
I have fitted the standard carb back on to the RD08 boot and I am going to leave the flatside until I can suss out what to do about it.
My eyes aint so good so I dont fancy stripping down the top part of the carb.
I am going to take a walk down to the local vet tomorrow and see if I can buy a 100ml syringe off him so I can fill the carb up.
Feeling well miffed about the flatside.:(:(:(
 

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my original method of mounting the carb was with this homemade thingy which clamped up using the original crf rubber , i made it so it would cant the carb slightly to the left and position it slightly lower , worked pretty good i only switched back to the original boot because i thought it would look tidier

http://

http://

http://


Hi Nick. Hope you doing okay, buddy.

By your description, I can understand what you are saying, but I can't see the photos. Just shows "http://"

What did you make the insulator flange out of?

I'm going to tweak this one then cast it out of aluminium/copper, polish and fit.
It will only work with the CRF insulator though.

I'll make a plastic cover for the carb that fits in with this modification (3d printed from polycarbonate).
 

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My carb is broken.
The black plastic arm on the pumper ( nr 65) that connects to the metal pushrod that operates the diaphram is broken and you cant seat the the rod into it so when I move the slide up and down, there is no movement in the pumper.
I have fitted the standard carb back on to the RD08 boot and I am going to leave the flatside until I can suss out what to do about it.
My eyes aint so good so I dont fancy stripping down the top part of the carb.
I am going to take a walk down to the local vet tomorrow and see if I can buy a 100ml syringe off him so I can fill the carb up.
Feeling well miffed about the flatside.:(:(:(
Maybe it broke when you put it back together.
I found it to be tricky and the plastic bits are weak

They made them out of ABS plastic. Should have been a steel part really
 

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Discussion Starter · #12 ·
Should be able to get a replacement part but I dont fancy stripping it.
I will have to give it to one of my mates to do for me for a case of beer. :thumbup:
 

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By your description, I can understand what you are saying, but I can't see the photos. Just shows "http://"

.
give me 5 mins i'll see if i can sort it , i can see the pics ok so not sure what i did wrong


can you see my blurry pics now or am i the only one that can see them
 

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Discussion Starter · #14 ·
When I fitted mine ,I just filed out a small bit of the casting and it fit snug as a bug in a rug.

12499473_1305461786136502_808154822_o.jpg

Only problem then was the return cable rubbed on the frame so 10 minutes with a round file sorted that problem out.

I ordered this from the states and the customs have just contacted me I have to pay £5 vat and £15 handling charges.

$_57 (2) (1).JPG
I dropped my carb off at my mates and he said he would sort it out for a case of his favourite beers or a bottle of scotch plus parts.
Problem is he said it will take a while cos he has to order the part.
Just out of curiosity ,how many turns should the pilot screw be out now because I dont have a CO2 sensor and this carb has cost me an arm and a leg......I hope its worth all the hassle. :thumbup:
 

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My carb is broken.
The black plastic arm on the pumper ( nr 65) that connects to the metal pushrod that operates the diaphram is broken and you cant seat the the rod into it so when I move the slide up and down, there is no movement in the pumper.
I have fitted the standard carb back on to the RD08 boot and I am going to leave the flatside until I can suss out what to do about it.
My eyes aint so good so I dont fancy stripping down the top part of the carb.
I am going to take a walk down to the local vet tomorrow and see if I can buy a 100ml syringe off him so I can fill the carb up.
Feeling well miffed about the flatside.:(:(:(
i bet it would still work a lot better than the stock cv carb even with the pump not working , the racers tend to adjust the carb to give about 1 second of squirt so it dont need a lot ,
did you get the slide problem sussed ?
 

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Just out of curiosity ,how many turns should the pilot screw be out now because I dont have a CO2 sensor and this carb has cost me an arm and a leg......I hope its worth all the hassle. :thumbup:
basically the pilot screw should be in the position that gives the best running ,
i'd get yourself one of these then you can fiddle with your pilot setting every time you stop at traffic lights , you cant get to the pilot screw when the carb is fitted so one of these flex jets makes the job 100 x easier
R&D Keihin FCR Flex Jet Remote Fuel Adjustment Screw | eBay
 

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Discussion Starter · #17 ·
I am not getting anything else from the states mate ,my bellmouth just spent 10 days in customs and they charged me a fiver for vat and then 15 quid handling charge so that doubled the price of it but it is still a very nice bit of kit.
I will use my standard carb until my mate susses it out and if he cant suss it I will find another carb.:thumbup:
The slide works fine now so are you saying it will work without the diaphram rod?
 

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Hi Nick. Hope you doing okay, buddy.

By your description, I can understand what you are saying, but I can't see the photos. Just shows "http://"

What did you make the insulator flange out of?

I'm going to tweak this one then cast it out of aluminium/copper, polish and fit.
It will only work with the CRF insulator though.

I'll make a plastic cover for the carb that fits in with this modification (3d printed from polycarbonate).
i can see there could be some demand for those parts , must be nice to have access to all that equipment , i guess your in the engineering / toolmaking trade ,
i made mine from a couple of bits of rusty mild steel tube that i had lying around and a piece of steel plate , was a right pain getting it just right
 
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