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Mechanics 101 Can't get it to run right? Find a trick to add HP?
From the first oil change to completely rebuilding the engine,
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Old 07-14-2017, 03:53 PM   #11
elianator
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Hey guys....I have never had something kick my ass so hard like this. Still stalls and WOT and wont get past it. Not much has changed. Changed all of the o rings on the boots for the intake side of the carb and still same problem. Sprayed every junction and I can't find a leak anywhere!! When I put my fingers in the air filter opening and partially obstruct it, the bike roars back to life, throttle smooth to WOT and no backfiring most of the time. Help!!! What else could this be? Does this bring me back to something like float height even though I double checked them and now have two sets or carbs, BOTH were doing the exact same thing.
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Old 07-14-2017, 11:19 PM   #12
ZookRick
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Do you have a stock airbox and stock type paper filter?
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Old 07-15-2017, 05:51 AM   #13
Kreylyn
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Partially obstructed carb ports would reduce the amount of fuel flowing through causing the carbs to run lean. Putting your hand over the intake decreases the air flow and increases the pressures pulling the fuel out of the carbs = richer mix.

My expectation is the carbs are still not fully cleaned. Specifically I'd check the ports internally from the air jets on in. A partial blockage between the main air jet and the emulsion chambers would cause problems.

Also just occurred to me... double check you put the needle jets in the correct way. It's not hard for someone to flip them upside down, and that would cause serious WOT running issues.

Krey
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Old 07-16-2017, 07:50 PM   #14
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Quote:
Originally Posted by ZookRick View Post
Do you have a stock airbox and stock type paper filter?
I have both oem and k&n. Initially, K&N has been in for years now with no issues. Switched back to the OEM and the same symptoms.

Quote:
Originally Posted by Kreylyn View Post
Partially obstructed carb ports would reduce the amount of fuel flowing through causing the carbs to run lean. Putting your hand over the intake decreases the air flow and increases the pressures pulling the fuel out of the carbs = richer mix.

My expectation is the carbs are still not fully cleaned. Specifically I'd check the ports internally from the air jets on in. A partial blockage between the main air jet and the emulsion chambers would cause problems.

Also just occurred to me... double check you put the needle jets in the correct way. It's not hard for someone to flip them upside down, and that would cause serious WOT running issues.

Krey
I had seen the needle jet question someplace else on the internet and a person discussing how the jet should not protrude through the hole inside of the main chamber, yet I always recall them to be protruding through a little. Do I have these backwards? Every picture I could find on these carbs seem to have them poking through. If you reverse it, it does not go through, but it does not seem to seat properly.

Last edited by elianator; 07-16-2017 at 07:50 PM.. Reason: Automerged Doublepost
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Old 07-17-2017, 07:53 AM   #15
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BTW.....I just aw a video on youtube of a Katana with no airbox on and the guy was revving it up just fine...If this is true and I find no air leaks at the intake, doesn't this make it almost certainly something internal? Will keep trying in the meantime.
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