pcnsd
Full Member
Posts: 113
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Post by pcnsd on Nov 14, 2008 23:06:19 GMT -5
Hi all
I recently acquired a 39mm FCR from a US 2002 YZ426F for use on my SR project. Upon inspection it is clear that neither the current filter or intake manifold will function. I was able to locate a K&N filter that should work, but I am still looking for an manifold adapter from the SR head to the carby. Does anyone know of a distributor for such, preferably in the States? I can make one if I have to, but for the work involved I am hoping for something off the shelf. Also any ideas on a starting point on the jetting?
Thanks for any and all responses.
PC
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RD
Full Member
Posts: 176
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Post by RD on Nov 15, 2008 2:23:40 GMT -5
Hi PC
I still have one of those carbs sitting in the garage for exactly the same reason, I have actually spent the money on a 38 Keihin CRS and I bought a Wellington manifold so that I could fit it right up. I do intend to try and fit the FCR to the manifold I bought and if it works will let you know.
Cheers
Rich
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Post by sjef on Nov 15, 2008 8:08:49 GMT -5
Hallo
i have used a xv1000se 1983 intake manifold on my fcr/sr500,
mountingholes need a little trimming.
regards sjef
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Post by boanerges on Nov 15, 2008 12:44:55 GMT -5
PC, I got my FCR from Sudco. It came with a manifold. I have posted a picture here but its a bit hard to see. The manifold is OK but clearance to the frame is a bit tight.  I saw some FCR manifolds on a Japanese sight that looked to be slightly curved to likely give better frame clearance. Will try to conjure up the name of the site from my memory.....Orange Boulevard maybe??? You might try Adrian at Vanem, he is super knowledgable and helpful. Ships to US no problem. Regards Bill-- |
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pcnsd
Full Member
Posts: 113
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Post by pcnsd on Nov 16, 2008 15:19:13 GMT -5
Thanks guys - Some good information here . I have been able to gather additional information also based on your posts. I have the Sudco catalog. It does not reference a FCR rubber carb mount adapter for the SR, just the stock unit. I will call them on Monday to see if they have something not shown. They do have a spigot adapter for the SR/FCR (fits from rubber mount to rubber mount) The problem with it is the ID is only 37.5mm and I have gone to some effort to have a 40mm intake port and a carb that is close. I also have not been able to locate anything searching for "Wellington adapter' and variations on the theme. I am going to chase down a few more options, but I will likely fabricate something if all else fails. Boanerges - I have never liked the way any aftermarket carb fit the SR/XT frames. There is always some issue with anything but stock. I have found that a spacer 22- 25 mm thick moves the carb rearward enough to clear the frame and also helps with the air filter placement. This pic shows the concept, they are not difficult to fabricate.  Thanks again |
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Post by sjef on Nov 16, 2008 16:33:05 GMT -5
Hallo ,
the id of a xv1000se 1983 manifold is 39mm with room for 41
regards sjef
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THUMPS
Junior Member
THUMPS, ridden by Dave
Posts: 92
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Post by THUMPS on Nov 16, 2008 19:26:47 GMT -5
I like your spacer pcnsd. I have a 36 mm mikuni on mine and had to set the Carburetor ferrule to its lowest setting and put on a bicycle shift cable and housing to make it turn enough to fit under the frame. My method works fine but the cable is a bit lightweight.
Probably off topic but I have an 89 Honda VTR 250 that is dying for nice thumper engine. No top tube to worry about. It cost 200 dollars for the entire bike.
Dave
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pcnsd
Full Member
Posts: 113
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Post by pcnsd on Nov 16, 2008 19:47:18 GMT -5
Thank you Sjef for the update. My local junkyards are closed Sunday and Mondays. I will go by on Tuesday for a look see, meanwhile I am watching ebay. There are a couple carb holder sets, but being frugal, I only want one. I have noted that Thumperstuff has a carb holder that will go to 40 mm. I'll give him a call on Monday to check if its a fit.
Thanks
PC
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Post by StewRoss on Nov 18, 2008 5:32:42 GMT -5
Here's an accessory Mikuni 38mm adapter that I have for the CRS...as I recall it's larger than 38mm inside beyond the end of the carby, as I had to make a plastic spacer for the inside to sleeve it down to 38mm...  This carby is one made to suit the SR and it has a Mikuni style inlet spigot... SR  |
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pcnsd
Full Member
Posts: 113
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Post by pcnsd on Nov 18, 2008 21:19:14 GMT -5
Thank you Stew. I had not considered the possibility of modifying the FCR carb to fit the Mikuni manifold boot. At first I though there may be a chance because the FCR diameter provided sufficient metal to trim, but when I measure the depth needed to seat the carb into the carb boot (15mm) I found only 10mm available.  I also chased down my other options to no acceptable result. I purchased a 6" length of 3.5" diameter of 6061 rod stock at the local metal recycler today and will start making an adapter to bolt from the SR head and fit into the Yamaha/FCR rubber during my lunch breaks for the remainder of the week. I should have something to show in a few days.  Thanks again PC |
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Post by StewRoss on Nov 19, 2008 1:13:53 GMT -5
Interesting...as you can see the aftermarket CRS and the FCR carbs have a removable spigot at the engine end to allow for different applications and lengths etc. Can the Yam carb do this? SR |
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pcnsd
Full Member
Posts: 113
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Post by pcnsd on Nov 19, 2008 22:01:18 GMT -5
Interesting...as you can see the aftermarket CRS and the FCR carbs have a removable spigot at the engine end to allow for different applications and lengths etc.
Can the Yam carb do this?
No Stew, regrettably it can not. It has a fixed spigot. No matter, I resolve the matter today during an extended lunch. (2 hours) The pictures show the progression.      Problem solved. now to finish the seat ;D PC |
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RD
Full Member
Posts: 176
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Post by RD on Nov 19, 2008 22:32:04 GMT -5
Hi PC Playing around in the garage today and I fitted my FCR up to my motor using the manifold from Wellington  (I just tried to search for wellington or WM but came up with a blank, VANEM used to have a link but not any more) anyway it actually fits more neatly than the CRS the manifold was designed for.  Bike started 3rd kick and runs nearly as well as the CRS which is set up for an SR, so now I really have a dilemma I have three carbs which all work, which one to use? I think I can rule out the standard carb but which to use out of the FCR or CRS. The CRS is a little neater as it doesn't have all the overflow and breather tubes that the FCR does. Cheers Rich |
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Post by StewRoss on Nov 19, 2008 23:08:34 GMT -5
The FCR has a pump...might tip the balance. Best way to tell is to try them both, if that's possible. Interesting comparison actually. Nice work PC... SR |
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Post by milkman on Nov 20, 2008 0:32:47 GMT -5
Rich, turns out my standard "modified" carb was butchered with an angle grinder on teh slide by the previous owner
(who also did a top end rebuild, yet 100km's later my crotch was on fire at the traffic lights from blown valve seats throwing oil all over a hot engine)
Anyway....
I had a spare, Carl is trying to salvage one out of two for me now, but if its no good, i'll might be able to grace your palm if you want to lose one of those carbs.
cheers
Downes
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