Topic: Lack of power at low revs

[scottly]

I thought height of gas in each bowl. Took a clear tube and put it on the drain of #1. Open the drain slowly. The gas ran down slowly , right to the top of the bowl. Did # 2, the same.. Did #3 and the gas stopped at the 1/4 from the bottom, hmmmm. I thought I had a gas restriction. Went back to # 1 and 2 both were the same. back to # 3 and the same 1/4 from bottom. I then lowered the tube to the floor to get the flow going, then put it back up along side the outer bowl and it stopped at the top of the bowl..

The fuel should naturally find it's level without having to lower the tube to the floor; perhaps plugged bowl vents??

[Tdinova]

I thought height of gas in each bowl. Took a clear tube and put it on the drain of #1. Open the drain slowly. The gas ran down slowly , right to the top of the bowl. Did # 2, the same.. Did #3 and the gas stopped at the 1/4 from the bottom, hmmmm. I thought I had a gas restriction. Went back to # 1 and 2 both were the same. back to # 3 and the same 1/4 from bottom. I then lowered the tube to the floor to get the flow going, then put it back up along side the outer bowl and it stopped at the top of the bowl..

The fuel should naturally find it's level without having to lower the tube to the floor; perhaps plugged bowl vents??

hmm, never thought of plugged vents,,, thanks

[Tdinova]

Well lets call it a winter. Had his carbs home on Saturday. I spent about 3 hours cleaning them up replacing a T 'O' ring between #1 and #2 carb. The bike fired up like my old carbs. Left it warm up a bit and went for a spin.. SAME>> I went back to my garage and opened the pilot screws to 4 turns as mine. and she went really good. Took his carbs back of and returned them.

Se you all next spring.
I'm going to play a bit more but 0f is a tad cool for playing in gas.

[Tdinova]

Ok I've settled in to a long winters rest not nap and doing some home work of Carbs/ how they work/height of floats and such.

I have read and different post on how to check the height of the float.

Can someone tell me where do I measure from and what reading should I get? I have been taking the measurement at the end of the float (meaning the end that travels the most).
The manuals picture is very dark and hard to see exactly where they are measuring from.

[Spanner 1]

Yep, the end away from the pivot pin ( right where dudes thumb is in your pic. ).... From that bottom edge of the float to the mating face of the carb body ( what the bowl mates to and where the seal sits ) must measure 12.5mm with the 'tab' just resting on the valve but not pressing any on the valve spring. The 12.5 mm reading applies only to PD 41A and PD 43A carbs, the PD 42B and PD 44A carbs measure 14.5mm  .
BTW... the carbs need to sit just like in the pic. for easy/correct reading.... hope 'hibernation' is not tooo long this year 

[BlackMax]

Well, at least I'm not the only one with this EXACT same problem.  As for mine, it's too lean, obviously, since I also have the "stall if you crack the throttle too quickly" symptom.  It used to be very tight.  Now, it makes that hollow sucking sound through the carbs.....then wants to stall.   Choked, it doesn't do this......just revs like fuel injection.

MY timing too is good.  I've had the carbs off a couple times.  FLoats good.   Mains seem good. Secondaries are fine (and it's good at WOT anyway).  

Tell you this-  it seems as if the longer I ride it, and flog on it when hot.....the better it seems to get.  I assumed the problem was that my motor is pretty modified (cam, open exhaust, pods)....so my assumption was that the primary jets were just too small.  ??   Could drilling them or getting larger be a fix??  I've never seen bigger primaries for sale.  Is there such a thing?

[Tdinova]

Did a lot of searching today and found this



The height is measured by the main jet. 12.5 mm. + the carbs should be on it`s side, float barely touching the needle plunger

Now to wait for a warm day +10c to remove the carbs and recheck them

[Tdinova]

Here is the document snipped and paste and location Page 3

http://goldwingchrome.com/Manuals/GL1000/Honda%20Goldwing%20Common%20Tool%20Manual%201979.pdf

Come on spring

[Spanner 1]

Disagree with the diagram... float height for the old style carbs with round floats would be across the main jet ( highest point on the round floats ) but on the 'flat' floats measure should be front edge for proper accuracy... that tool is waaay unnecessary, just a ruler in mm. scale works fine....... IMHO.