Bog Down at full throtle after Uni Filter installation -CRF's Only Forums

jtcohenour · by **jtcohenour** » Sun Jul 29, 2007 7:49 am

Yesterday I installed a new Uni filter. Previous to that I was running the stock filter. After installation I started the bike and let it warm up. On my bike stand when I pull the throttle back rapidly from idle the bike bogs down and dies. I have the power-up kit installed with the clip in the middle. The main jet is a #132. The exhaust is stock with the baffle removed. The snorkel is also removed. I ride around 2000ft in Tucson, AZ. My bike does not have a fuel mix screw installed.

Any suggestions?

mr50 · by **mr50** » Sun Jul 29, 2007 6:04 pm

i stoped at the local honda shop yesterday to get a new tube for my front tire and i was asking the mechanic about instaling the power up kit he told me that i need to buy a good aftermarket pipe if iwas going to put in apower up kit as well open up the airbox and adjust the jets he also you have to keep adjusting with the carb until you geet it right

K D · by **K D** » Sun Jul 29, 2007 7:21 pm

Perfectly normal, these carbs do not have an accelerator pump. When you "wick" the throttle you get a lot of air and little fuel. Did you ride it, how did it act?

zak13 · by **zak13** » Sun Jul 29, 2007 7:57 pm

can sum 1 explain to me what a accelarator pump does

gal8x · by **gal8x** » Sun Jul 29, 2007 10:15 pm

jtcohenour wrote: My bike does not have a {CRF’s Only} fuel mix screw installed.

K D is right… you can’t, and should not “wick” the throttle. But adjusting you fuel/air screw is necessary if you want your bike running at its best. The “D” head tool is a joke at $100 so I suggest you either replace your stock screw or cut a notch in it so a regular screwdriver will turn it.

jtcohenour · by **jtcohenour** » Mon Jul 30, 2007 5:52 am

I am going to buy aftermarket exhaust, hopefully over the next several weeks. I really like the look of th Dr. D setup. I will try doing some adjusting when i put on the new exhaust, I could fool with everything now but would have to do it again. As for how the bike is running I went riding with my son yesterday and the bike ran well when the clutch was not pulled in. There is a noticable difference in bottom end with the uni filter. The bike seemed more aggressive. My bike does not have fuel mix screw at all.

ChaosRider · by **ChaosRider** » Mon Jul 30, 2007 11:27 am

[quote="jtcohenour"]I am going to buy aftermarket exhaust, hopefully over the next several weeks. quote]

If you've removed the baffle from the stock exhaust, you won't get much more from an after market pipe.

Proper fuel screw adjustment is critical (not the idle screw).

CRFSONLY sells a very nice no tools needed, replacement fuel screw.

Installing it and properly adjusting the idle mixture will greatly improve throttle response.

http://www.crfsonly.com/catalog/shopping_cart.php/sort/2a

jtcohenour · by **jtcohenour** » Mon Jul 30, 2007 11:44 am

I just purchased a fuel screw from the web site. I there anything I need to know about installing it. I would assume you need to completely pull the carb off.

gal8x · by **gal8x** » Mon Jul 30, 2007 5:58 pm

jtcohenour wrote: My bike does not have fuel mix screw at all.

Yes it does.

It is on the bottom of the carb, tward the front, in a well. It is brass and has a head in the shape of a “D”.

jtcohenour wrote:I just purchased a fuel screw from the web site. I there anything I need to know about installing it. I would assume you need to completely pull the carb off.

You do not need to pull the carb. Just loosen the boot clamps and twist it.
You will need the spring, washer and o-ring from the old screw. If you screw is truly missing then you will need an OEM replacement because the spring and washer are not sold separately, the o-ring is.
Luck

mr50 · by **mr50** » Mon Jul 30, 2007 6:30 pm

the mechanic at the honda shop told me taken the baffle only makes it louder i was going to do that to my 230 as well but im gone save up the money and get the exhaust to go with the kit and open the air box up so that means ill have to save up, i hadnt checked crfs price yet he told me about $300.00 for a new exhaust

gal8x · by **gal8x** » Mon Jul 30, 2007 9:39 pm

mr50 wrote::?: the mechanic at the honda shop told me taken the baffle only makes it louder

Bovinescatology.

Removing the baffle will allow the motor to exhale more air. This does not help the engine unless you help it inhale more air, pull the snorkel. Such changes to your motor will require more fuel to go with the extra air, Honda power-up kit.

Asmith · by **Asmith** » Mon Jul 30, 2007 9:43 pm

gal8x wrote:Bovinescatology.

Nice! I learned a new word today...

gal8x · by **gal8x** » Mon Jul 30, 2007 11:29 pm

~ wrote:
gal8x wrote:Bovinescatology.

Nice! I learned a new word today...

Credit Gen Norman Schwarzkopf Ret.

mr50 · by **mr50** » Tue Jul 31, 2007 6:03 pm

even if you add those upgrades to the 230 does it give it that much power that you could hang with the 250 thumpers i ride mostly wooded trails there is a lot of steep climbs that it would be good to have im the only one in the group that rides the 230 most of my of the other guys ride 250 thumpers and 250 2strokers i try to keep up with there dust

zak13 · by **zak13** » Tue Jul 31, 2007 7:57 pm

250 thumpers maybe 250 smokers hell no

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