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Cody's Custom Quads
I just purchased a 39mm fcr carb for my 416. My question is does everyone run a thumb throttle or a twist throttle with these carbs. I have a moose throttle housing i'll use with this carb to open it up fully and quickly making it more responsive. I have had trouble with aftermarket carbs pushing hard with a thumb throttle and was wondering what to expect with this one and a thumb throttle.
" Determination is the strength needed to succeed."
Senior Member
I use a thumb throttle with mine, and I did not notice a difference in how hard it is to push compared to the stock one.
2007 yfz450 -- black Maier fenders, Oury grips, CFM aluminum air box without the lid, 250r K & N air filter, Curtis Sparks X-6 full exhaust, cam mod, IMS-Roll Intimidator MX bumper, AC Racing Blackline Pro-peg nerf bars, Hiper beadlocks, Kenda Claw XCR tires
2001 400ex -- black Maier fenders, JE 10.5 to 1 std bore piston, Hotcam old Stage 2, FCR 39mm carb, port and polished head, valve job, White Brothers Pro Meg full exhaust, K & N air filter, no air box lid, Big Gun rev box, race cut front fenders, OMF air scoops, PRM swing arm skid plate, Tag X5 handlebars, Oury grips, 15/38 gearing, Kenda Claw XCR tires, Barnett Dirt Digger clutch, yfz450 front shocks
Member
Mine is a little harder to push, but not too bad.
Senior Member
Mine is a lot easier to push than the stock carb. I haven't ridden with it yet because I am waiting for my head, but it is noticably easier to push.
2001 416EX
Yeah, it's tuned.
Not a Dude a Girl
I have the moose thumb throttle also and the fcr carb works really well.
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Senior Member
I'm running the stock thumb throttle with mine, and I didn't notice a difference in pull.
2002 416EX -
JE 10.8:1 piston, HRC cam, FCR39, Ported & polished head, Sparks HD cam chain, CFM airbox w/o lid, K&N filter, WB e-series, PRM desert bumper & chassis skid plate, pro-design kill switch & power shifter, Renthal handlebars, ASV brake and clutch lever, Nac's P-brake block-off, GCD air scoops, Factory Effex graphics/seat cover, TCS Race Series front shocks w/ remotes, Big Cohoona shock covers, Burgard's twin row carrier, Burgard's rear beadlocks.
2000 Honda CR250r
2004 Harley-Davidson Fat Boy
Senior Member
I jumped off mine and right onto Jack's and I noticed a huge difference. His was a ton faster than my quad.Originally posted by RytM1
I'm running the stock thumb throttle with mine, and I didn't notice a difference in pull.
But the pull was the same.
'02 Red 400
It's faster now then when I bought it!
Cody's Custom Quads
boy i'm glad to hear good news. i had lots of trouble in the past with thumb throttles pushing hard.
" Determination is the strength needed to succeed."
Senior Member
I didn't feel any difference in myne eather.
2002 yellow 416ex
Ross Piston 11:1 compression
Hotcams stage 2
Porting
Spark's X-6 exhaust
FCR 39mm carb
165 main jet/ 52 pilot jet
LSR +2 A-arms
LSR +4 axle
Elka tripple rate fronts
Derisi rebuild rear shock
Spark's rev limiter
K&N Filter/Outerware
Tinner Air Scoop
Holeshot XCR on stock rims
Tag T-2 handlebars
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