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Carb (Airbox issue?)

Fuel System: Gas (Petrol) tanks, Carburators
rrietman
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Post by rrietman » Tue Apr 12, 2011 2:07 am

you're overthinking this. always look for the simple stuff first. if the choke pulls the rpm's up then you are lean. in this order:blocked fuel, needle position, floatlevel, idle jet, idle air. you don't need a different main jet to pull from idle. if you are running without mufflers or air filters you will have problems making power at rpm's, but it should pull from idle. take a deep breath and think this thru.
Randy

pknopp
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Post by pknopp » Tue Apr 12, 2011 7:51 am

If it's running lean (which it likely is) it doesn't care which way the bike is leaning.

Sascha
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Post by Sascha » Tue Apr 12, 2011 7:55 am

But no one has offered an explaination as to why it would die when leaning it to the left and accelerate when leaning it to the right!? ... Anyone?

Dana01
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Post by Dana01 » Tue Apr 12, 2011 8:48 am

Assuming the lean to left/right is not accompanied by bar turning (which could point to a cable routing/pinching issue), is it possible there's a hairline crack in one of the carb castings (the right carb?) allowing fuel to go from where it's supposed to be, to where it's not, when the bike is leaned over???

Just brainstorming ....
Dana

1966/7 CB-77 Red of course
1976 CB-550F (project over-budget and under-funded)
1985 GS-450S (Land Speed Racer)

Sascha
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Post by Sascha » Tue Apr 12, 2011 10:17 am

There is only one carb on a honda 305 dream... No cracks either.
No bar turning (keeping them straight through this whole process).

Anyone else!?
Dana01 wrote:Assuming the lean to left/right is not accompanied by bar turning (which could point to a cable routing/pinching issue), is it possible there's a hairline crack in one of the carb castings (the right carb?) allowing fuel to go from where it's supposed to be, to where it's not, when the bike is leaned over???

Just brainstorming ....

LOUD MOUSE
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Post by LOUD MOUSE » Tue Apr 12, 2011 10:24 am

Take it to a bike shop and get it looked at by a mechanic. ......................lm

Sascha wrote:There is only one carb on a honda 305 dream... No cracks either.
No bar turning (keeping them straight through this whole process).

Anyone else!?
Dana01 wrote:Assuming the lean to left/right is not accompanied by bar turning (which could point to a cable routing/pinching issue), is it possible there's a hairline crack in one of the carb castings (the right carb?) allowing fuel to go from where it's supposed to be, to where it's not, when the bike is leaned over???

Just brainstorming ....

Sascha
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Joined: Mon Sep 27, 2010 12:36 pm
Location: Toronto, Canada

Post by Sascha » Wed Apr 13, 2011 6:50 am

Hey LM,

With all due respect, isn't doing it yourself and learning what forums like this exist for!?
I appreciate the suggestion but thats not why I am building it myself, I want to learn and continue to appreciate/understand the bike more and more.

On a lighter note, I have identified the issue that causes the bike to idle when leaned right, the right cylinder is firing, the left is not. I checked for spark on the left plug and alas there is NO spark so I have a problem with wiring that I need to sort out... Thats where I stand now.

it would make sense that its not getting enough fuel as there isnt enough suction caused by the lack of one of the clyinders firing.. its turning over, just not igniting becuase of the lack of spark.

-Sascha

LOUD MOUSE wrote:Take it to a bike shop and get it looked at by a mechanic. ......................lm

Sascha wrote:There is only one carb on a honda 305 dream... No cracks either.
No bar turning (keeping them straight through this whole process).

Anyone else!?
Dana01 wrote:Assuming the lean to left/right is not accompanied by bar turning (which could point to a cable routing/pinching issue), is it possible there's a hairline crack in one of the carb castings (the right carb?) allowing fuel to go from where it's supposed to be, to where it's not, when the bike is leaned over???

Just brainstorming ....

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