FCR39 ... anyone do this or try this carb

oggo69 · Post by **oggo69** » January 18th, 2009, 2:08 pm

as above guys anyone ever use or try an FCR carb ? comments please

ta
oggo

100hp honda · Post by **100hp honda** » January 18th, 2009, 4:45 pm

ive heard of those carbs but i dont know much about them. im under the impression theyre only for 4strokes but i really not sure. what bike you trying to put it on ?

oggo69 · Post by **oggo69** » January 19th, 2009, 5:40 am

on a cr500 dude , they are generally off 4t and they a flatside carb , just wondering if anyone experimented with one

97af · Post by **97af** » January 19th, 2009, 6:03 am

If you've got one laying around,try it out. I put a Mikuni TM flat slide on a XR600 (two stroke carb) . I dont know if a 4 stroke specific carb would be backwards compatible on the two stroke though.

oggo69 · Post by **oggo69** » January 19th, 2009, 10:01 am

ok i might see if can get a loan of one off a mate in the UK , just for pig iron , only issue i can see with one is they have a pumper on them to squirt extra fuel on on run off .... mmmmm has me thinkin

Post by **AlisoBob** » January 19th, 2009, 11:06 am

I see this as a total waste of time.

britincali · Post by **britincali** » January 19th, 2009, 12:06 pm

oggo69 · Post by **oggo69** » January 19th, 2009, 12:16 pm

why ? at least give some wisdom to the wise answer

Post by **AlisoBob** » January 19th, 2009, 12:49 pm

1. Its 39mm...... Whoop-de-doo.

2. It has an accelarator pump that you dont need.

3. Its incredibly short, intake to outlet. It will be hard to fit.

4. It takes an entirely different throttle assembly.

5. It isnt cheap ( $$$$)

oggo69 · Post by **oggo69** » January 19th, 2009, 1:01 pm

AlisoBob wrote:1. Its 39mm...... Whoop-de-doo.

2. It has an accelarator pump that you dont need.

3. Its incredibly short, intake to outlet. It will be hard to fit.

4. It takes an entirely different throttle assembly.

5. It isnt cheap ( $$$$)

so i take it nobody ever bored out the PWK carbs ?
point taken on acclelartor pump , my only concern really
i will offer one up , point taken on overall length , but a K&N will be on the inlet , so only outlet is a concern , they go for about 150 quid over here , but as i mentioned i can get a loan of one to try .... reason iwant to find out is they are very simple to set up .... ta for the pointers alisobob

Post by **AlisoBob** » January 19th, 2009, 1:12 pm

Nothing is simpler than a Kehein PWK

redrocket190 · Post by **redrocket190** » January 19th, 2009, 2:50 pm

It's designed for a four stroke. Period.

dannygraves · Post by **dannygraves** » January 20th, 2009, 12:37 pm

AlisoBob wrote:Nothing is simpler than a Kehein PWK

PWK is the shiz! if I build another fast bike, pwk 41mm all the way if I'm sticking to gas. Although I really like my mikuni tm41pro and it obviously has some seriouse engineering and technology packed into a very finely built carb... its just a bear to dial in. I had noticeble gains switching to mikuni from a pwk 39, but the pwk39 started 1 kick and was far less tempermental on tuning. I got my mikuni running tits now after an exhaustive amount of tuning... but still takes 3 kicks to start everytime... kinda weird.

ellett · Post by **ellett** » January 20th, 2009, 9:50 pm

Does a two-stroke even create enough vacuum to operate an FCR carb?

And the fuel screw is gonna be a bitch adjust.....

oggo69 · Post by **oggo69** » January 21st, 2009, 12:16 am

ellett wrote:Does a two-stroke even create enough vacuum to operate an FCR carb?

And the fuel screw is gonna be a bitch adjust.....

good point !

oggo69 · Post by **oggo69** » February 11th, 2009, 1:24 pm

mmmmm .... read down till u see twin carbs , FCR's ...

http://www.twostrokeshop.com/two_stroke ... es.htm#eng

Post by **AlisoBob** » February 11th, 2009, 1:31 pm

"We have adapted Keihin FCR semi-downdraught carburettors for two-stroke use; employing custom emulsion tubes and jets ... making them harder to tune spot on but ultimately, a more accurate metering device."

Yea... just what I want on my dirt bike.... A 38mm carb ( like stock).. but it takes custom, expensive parts.. and its a bitch to tune.

Sign me up!

dannygraves · Post by **dannygraves** » February 11th, 2009, 1:35 pm

my mikuni is a bitch to tune but ran noticeably better after I got it dialed in. of coarse, the size and powerjet were the biggest differences and would have been the same if I used a 41 pwk and a powerjet.
the FCR seems pointless to me.

britincali · Post by **britincali** » February 11th, 2009, 1:36 pm

Have you ever had that thing "dialed in"??????

dannygraves · Post by **dannygraves** » February 11th, 2009, 1:38 pm

sure, it runs great right now! only still takes 3 kicks to start everytime

but I think thats also partially because of the 250 ignition

oggo69 · Post by **oggo69** » February 11th, 2009, 1:38 pm

AlisoBob wrote:"We have adapted Keihin FCR semi-downdraught carburettors for two-stroke use; employing custom emulsion tubes and jets ... making them harder to tune spot on but ultimately, a more accurate metering device."

Yea... just what I want on my dirt bike.... A 38mm carb ( like stock).. but it takes custom, expensive parts.. and its a bitch to tune.

Sign me up!

reason i put it up is that peeps were adamant it would not work .... well it does

, oh and they dont come in 38mm

Post by **AlisoBob** » February 11th, 2009, 1:40 pm

oggo69 wrote:[
reason i put it up is that peeps were adamant it would not work .... well it does

Anything will work if you throw enough money at if...

Shit, Brit will prolly' brush his teeth, for the right price.

oggo69 · Post by **oggo69** » February 11th, 2009, 1:47 pm

AlisoBob wrote:
oggo69 wrote:[
reason i put it up is that peeps were adamant it would not work .... well it does
Anything will work if you throw enough money at if...

Shit, Brit will prolly' brush his teeth, for the right price.

100hp honda · Post by **100hp honda** » February 11th, 2009, 4:00 pm

i dont think anybody had intenstions of crushing your dreams of making that carb work, everyone just asked "why". i cant make sense of everyones ideas, and everyone cant make sense of mine

. if it works then good on ya

oggo69 · Post by **oggo69** » February 12th, 2009, 12:42 am

100hp honda wrote:i dont think anybody had intenstions of crushing your dreams of making that carb work, everyone just asked "why". i cant make sense of everyones ideas, and everyone cant make sense of mine . if it works then good on ya

i dont have dreams i simply asked if anyone has tried it , and i suppose "why" would TSS do it ? , taking into account these boyz seem to know exactly what they are at . i will look into properly when i am at that stage of my build , i could report "complete waste of time" or a result ....

but my point of refreshing the topic was it does work

BannedCR500Riders.com

FCR39 ... anyone do this or try this carb

FCR39 ... anyone do this or try this carb