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Carb service: Total time about 1/2 an hour.
You should remove and clean the carb. Just take your time, disconnect the throttle linkage, choke linkage, fuel supply line and upper part of scavenger tube from the exhaust manifold. Take care not to bend that small copper line (3/8 wrench) as they can be troublesome to reconnect. Keep it lined up.
After that, use a 1/2 wrench to loosen the carb bolts that hold it onto the manifold. Loosen the rear bolt first and start backing it out bit by bit...at some point it will be easily turned with your fingers. Once that is done you start on the front one, closest to you and more accessible. Again back it loose and then you hold or slightly wiggle the carb as you back of the bolt with your fingers...once done lift the carb away from the engine and just take it some where where you can work on it.
There are 4 or 5 (new model) bolts that hold the carb together. Remove them all and gently separate both halves about 1/8 inch. Take care not to damage the gasket, they usually come apart nicely without destroying the gasket. At this point separate both halves and then remove the big round thing in the middle....venturi being careful to work the gasket around and off the venturi.
Now you need a piece of paper towel to lay your clean stuff on....we will call this "laying it off to the side". You will notice the float, bulby looking thing. There's a pin across that holds it in...remove that with your fingers and lay off to the side on some thing clean...lift off the float and do not bend it ...lay off to the side, remove the needle valve and clean the tip with brake clean...ensure it is still pointed but don't be too aggressive on it...light rub between finger and thumb with some brake clean...lay off to the side.
Cleaning jets: You NEED the PERFECT size flat head screwdriver to do that...if you don't have one get one. It must fit the exact slot in the jet without tearing into the side of the hole bore that the jet goes into...we are trying not to mess up the threads. There are 5 different sizes, including the one under the float ...you can make a screwdriver the size you need using a grinder.
NOW put on Safety Glasses for brake clean work. Once all the jets are out you spray everything down with a good brake clean (that's what I use) or carb cleaner. Then ream a small wire through each hole (we are not drilling here, we a pushing through a wire strand that closely fits the size of the hole)....now you spray it again with brake clean and drive it through the passages again. Look through the hole against the light and see that you can see through it ....spray with brake clean again....once you are sure each jet is clean, one by one, spray with brake clean and blow compressed air through them.... lay them off to the side.
Carb Body....clean each part...brake clean the area from fuel intake, jet passages, clean out float bowl ...everything and then blow compressed air through all passages.
Assembly, clean your hands and reassemble taking care not to get any little pieces of dirt on things. I wrote this in case you have never done one before, just take your time and take care on how it comes apart and put it back together the same way. The gasket and venturi assembly are a little bit tricky for the first timer but it's easy, I'm sure you will see how it goes....no major.
Once you have established compression on all 4 cylinders you put your cleaned carb on and she'll fire up....I figure on about the 9th turn.
You should remove and clean the carb. Just take your time, disconnect the throttle linkage, choke linkage, fuel supply line and upper part of scavenger tube from the exhaust manifold. Take care not to bend that small copper line (3/8 wrench) as they can be troublesome to reconnect. Keep it lined up.
After that, use a 1/2 wrench to loosen the carb bolts that hold it onto the manifold. Loosen the rear bolt first and start backing it out bit by bit...at some point it will be easily turned with your fingers. Once that is done you start on the front one, closest to you and more accessible. Again back it loose and then you hold or slightly wiggle the carb as you back of the bolt with your fingers...once done lift the carb away from the engine and just take it some where where you can work on it.
There are 4 or 5 (new model) bolts that hold the carb together. Remove them all and gently separate both halves about 1/8 inch. Take care not to damage the gasket, they usually come apart nicely without destroying the gasket. At this point separate both halves and then remove the big round thing in the middle....venturi being careful to work the gasket around and off the venturi.
Now you need a piece of paper towel to lay your clean stuff on....we will call this "laying it off to the side". You will notice the float, bulby looking thing. There's a pin across that holds it in...remove that with your fingers and lay off to the side on some thing clean...lift off the float and do not bend it ...lay off to the side, remove the needle valve and clean the tip with brake clean...ensure it is still pointed but don't be too aggressive on it...light rub between finger and thumb with some brake clean...lay off to the side.
Cleaning jets: You NEED the PERFECT size flat head screwdriver to do that...if you don't have one get one. It must fit the exact slot in the jet without tearing into the side of the hole bore that the jet goes into...we are trying not to mess up the threads. There are 5 different sizes, including the one under the float ...you can make a screwdriver the size you need using a grinder.
NOW put on Safety Glasses for brake clean work. Once all the jets are out you spray everything down with a good brake clean (that's what I use) or carb cleaner. Then ream a small wire through each hole (we are not drilling here, we a pushing through a wire strand that closely fits the size of the hole)....now you spray it again with brake clean and drive it through the passages again. Look through the hole against the light and see that you can see through it ....spray with brake clean again....once you are sure each jet is clean, one by one, spray with brake clean and blow compressed air through them.... lay them off to the side.
Carb Body....clean each part...brake clean the area from fuel intake, jet passages, clean out float bowl ...everything and then blow compressed air through all passages.
Assembly, clean your hands and reassemble taking care not to get any little pieces of dirt on things. I wrote this in case you have never done one before, just take your time and take care on how it comes apart and put it back together the same way. The gasket and venturi assembly are a little bit tricky for the first timer but it's easy, I'm sure you will see how it goes....no major.
Once you have established compression on all 4 cylinders you put your cleaned carb on and she'll fire up....I figure on about the 9th turn.
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