Hot Start & other issues with a new carb

[flyboy1294]

Hey guys,
Well I just won a CRF 450 carb on the Bay. It's a 40mm FCR, which is exactly what my builder reccommended. I will have to worry about the clearance with the gastank, but no big deal.
$128.51, I can't complain.

Anyway, I know peope often plug the hotstart on aftermarket carbs. What is this exactly? And is it going to cause me an issue?

I know it's a simple question, but it is way passed time to get it back together.

[Thumpin440ex]

It is just a plunger that is in the back of the carb. Needs to be filled with rtv, sealed off air tight.. I am not sure if it is in the same location on the carbs after 04-05

John

i have a 06 450 carb and i didnt block any thing off. so what is that your trying to block off can you put pics up to show me what your talking about ? im not shoure what the hot start is .

what did you do to get it to clear the tank? and what year did you go with?

[flyboy1294]

Originally posted by Thumpin440ex
It is just a plunger that is in the back of the carb. Needs to be filled with rtv, sealed off air tight.. I am not sure if it is in the same location on the carbs after 04-05

John

I think I will go the route of investing in a hot start block off, just to be safe. What is the reason the hot start cannot be used?

I know the odds are I will need a new throttle cable. I am prepared for this.

Is there any other issues I should expect to encounter?

what does the sparks cdi do for you and how does it help?

what year carb is it ?

[flyboy1294]

Originally posted by ericcrip
what did you do to get it to clear the tank? and what year did you go with?

Eric,
I will use rubber bushings to raise the tank and plastic to create clearance.

Also, the carb you're using is a 42mm Keihn for a 04-05 450r(quad)

The one I got is a 40mm FCR for an 03 Crf450 (dirtbike)

I don't know if the carbs are the same. If your's runs right, I wouldn't worry lol.

i was just asking to see if i could help . and my carb is a 06 flat slid.

[flyboy1294]

Originally posted by ericcrip
what does the sparks cdi do for you and how does it help?

I don't know if you're talking to me or not; I do not have a Sparks cdi. However, I know most of the 400ex's power is made before it hits the stock rev limiter. Because of this, an aftermarket cdi would not help at all unless you drag raced (which I'm aware you do), so maybe you will see some gain from it. I don't know for certain.

[flyboy1294]

Originally posted by ericcrip
i was just asking to see if i could help . and my carb is a 06 flat slid.

No problem.

I might be wrong then, do you know the diameter of it? The 06+ on the 450r is an FCR as you said, I think.

And if that is the case, did you have any trouble mounting it?

humm did i do some thing to piss some one off or is it just me? never tryed to do that. im the type that will do what ever i can to help some one out. but time to time i did joke around an it gets taken the roung way.

[flyboy1294]

Originally posted by ericcrip
humm did i do some thing to piss some one off or is it just me? never tryed to do that. im the type that will do what ever i can to help some one out. but time to time i did joke around an it gets taken the roung way.

I'm not pissed off. I was being serious this entire time. I am beyond confused at this point. :eek2:

some i had to bore the intake boot a lil. but i used the cable that came with the carb.

not u some other seam to act that way some times.

did u look at the pics i put up on the carb?

[flyboy1294]

Originally posted by ericcrip
some i had to bore the intake boot a lil. but i used the cable that came with the carb.

Alrighty, I'll get the carb here and take a look at it.

And I can't say much for the others, but no hard feelings here. I appreciate the help.

[flyboy1294]

Originally posted by ericcrip
did u look at the pics i put up on the carb?

I have not, could you post a link?

it goig to be at the top of the fourm 450 carb and videos

did u see it ?

[flyboy1294]

Originally posted by ericcrip
it goig to be at the top of the fourm 450 carb and videos

I just saw it. Looks really good and from the video it runs good too. I noticed from the pictures that the top of the throttle body seems to be modified. Did you do this?

yes to get it to clear the tank .

its fast it runs 8.545 @ 73.04 mph in the 1/8 mile 660 feet going to stage 3 h/c just put it in to day.

[flyboy1294]

Originally posted by ericcrip
yes to get it to clear the tank .

Alright I may need to do the same for mine. Do you think dirt would get in there and gum things up?

And that's extremely fast for a 400.