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K750 Fuel Problem

#1

T

tim4

I have a husqvarna k750 which has new cylinder, piston and rings and new crank seals. It will run if you squirt fuel in the sparkplug hole but it does not seem to suck the fuel up from the tank. The fuel filter is new and fuel is getting to the carb when I take the line of f fuel runs out of the fuel line. The diaphram is good in the carburetor and when you press it down carb cleaner goes through the needle and seat fine. There is a hose that is fine which goes to 2 connections on the carburetor. I think that is for the fuel pump system.


#2

Tiger Small Engine

Tiger Small Engine

tim4 said:
I have a husqvarna k750 which has new cylinder, piston and rings and new crank seals. It will run if you squirt fuel in the sparkplug hole but it does not seem to suck the fuel up from the tank. The fuel filter is new and fuel is getting to the carb when I take the line of f fuel runs out of the fuel line. The diaphram is good in the carburetor and when you press it down carb cleaner goes through the needle and seat fine. There is a hose that is fine which goes to 2 connections on the carburetor. I think that is for the fuel pump system.
Click to expand...
If you are getting good, steady fuel flow to carburetor, then the carburetor needs attention and be cleaned.


#3

T

tim4

I think it will work now sinced I cleaned the fuel pump section again


#4

T

tim4

I got it running but how can I get to the adjustment screws after I put the air cleaner assembly in there is no hole to get to the mixture screws.


#5

T

tim4

I found out there is a small piece that slides off which has a opening to get to the adjustments. On the replacement cylinder I bought the hole that the vibration spring screw goes in is not tapped. It is a 7.100 metric tap sice. Is that a common size or is it special size.


#6

R

RevB

tim4 said:
I found out there is a small piece that slides off which has a opening to get to the adjustments. On the replacement cylinder I bought the hole that the vibration spring screw goes in is not tapped. It is a 7.100 metric tap sice. Is that a common size or is it special size.
Click to expand...
There's a large range of metric threads. Industrial standards define 1st, 2nd and even 3rd choice diameters in order to rationalise and reduce necessary stocks as far as reasonably possible. M7 is a 2nd choice size, so not common. That would be .2755 in. 35/128". You sure it takes an over 1/4" bolt?


Where is this located?


#7

B

bentrim

If memory serves me right that should be a self tapping screw.


#8

T

tim4

I figured that but the screw was going in too hard and I was afraid of braking it off.


#9

StarTech

StarTech

Doesn't look like a Self tapper. Now if the screw is tri-lobular then it is a self tapper.

With the measurement being 7.1 mm it more likely 9/32-32 screw but this why you use thread gauges so you know if metric or not.

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#10

R

RevB

RevB said:
There's a large range of metric threads. Industrial standards define 1st, 2nd and even 3rd choice diameters in order to rationalise and reduce necessary stocks as far as reasonably possible. M7 is a 2nd choice size, so not common. That would be .2755 in. 35/128". You sure it takes an over 1/4" bolt?
Click to expand...

StarTech said:
Doesn't look like a Self tapper. Now if the screw is tri-lobular then it is a self tapper.

With the measurement being 7.1 mm it more likely 9/32-32 screw but this why you use thread gauges so you know if metric or not.

View attachment 70917
Click to expand...
That's a self tapper all right.


#11

R

RevB

tim4 said:
I figured that but the screw was going in too hard and I was afraid of braking it off.
Click to expand...
StarTech is right. Run it in then run it out several times with blowing out the hole between attempts. It will go to its final depth but don't force it. Slow and easy.


#12

T

tim4

That is what I did but it was going in too hard so a machine shop friend looked at it and he said the screw that was in the new spring I got is too big diameter for the hole so he let me borrow a 6.1 metric tap and it worked fine.


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