- Joined
- Nov 22, 2015
- Messages
- 39
- Reaction score
- 0
- Location
- Lenexa, KS
- My Bike Models
- 2003 Honda Valkyrie
Well, I've been rehabbing my '77 and wondering why it only has 13K miles on it. I don't know how many owners it's had but more than likely there have been quite a few hands laid upon it to excise the demons. Now it's my turn.
I've been through the bike from front to back and sorted out most of the usual things that need to be addressed. As far as the engine goes I've replaced the timing belts , valve seals and set the valve clearances all to 0.004". I went through the carburetors and inspected all the brass to be sure that everything is as it should be (and is in the correct location) and blew cleaner or air through all the ports to ensure they're open, and set the float levels to 21mm. I also checked and set the static timing of the Dyna S module. I also modified the air bleed orifice to be 0.038 using a #62 drill bit as per the recommendation of Randakk's site. I have aftermarket Emgo coils with new spark plug wires and 5K resistor caps that are all in great condition.
A test run demonstrated a very soft engine performance around 1-2K rpm with the engine being slow to return to idle @ 950. It idles great but is slow to rev and slow to return to idle. My trusty Champion neon spark tester shows that all cylinders are getting spark without obvious missing or weakness.
I checked for air leaks using propane and found none. The carb balance has also been adjusted to spot on. Checking the plugs reveals that cylinders 1,2 and 4 are very lean with snow white porcelain. Cylinder #3 looks much more normal with some black/brown on the porcelain but no soot or wetness.
Sooo, I pulled the carbs to have another look at them. I drained each bowl in turn and weighed the gas and found them to all hold about 27 grams of fuel. I flipped the carbs over and removed the bowls for an inspection. I see some differences between the four carburetors that I can't understand so I'm hoping that someone here can help me with what I see.
I have circled two orifices that are common to all carburetors. I'll call them orifice #1 and orifice #2. Orifice #1 is round and orifice #2 is oval. The mystery is that they're not all drilled the same in each of the four carburetors.
Here's what I have (X = not drilled, O = drilled):
Carb.......Orifice#1......Orifice#2
#1..............X................O
#2..............X................X
#3..............O................O
#4..............O................X
I'd love to know if this is common to GL1000 carbs and what the reasoning is for the hit-and-miss condition of the orifices shown. Ideas anyone?
(Oh, and yes, I know that there are parts missing off of the carb jets, plug etc., I pulled them out for measurements.)
I've been through the bike from front to back and sorted out most of the usual things that need to be addressed. As far as the engine goes I've replaced the timing belts , valve seals and set the valve clearances all to 0.004". I went through the carburetors and inspected all the brass to be sure that everything is as it should be (and is in the correct location) and blew cleaner or air through all the ports to ensure they're open, and set the float levels to 21mm. I also checked and set the static timing of the Dyna S module. I also modified the air bleed orifice to be 0.038 using a #62 drill bit as per the recommendation of Randakk's site. I have aftermarket Emgo coils with new spark plug wires and 5K resistor caps that are all in great condition.
A test run demonstrated a very soft engine performance around 1-2K rpm with the engine being slow to return to idle @ 950. It idles great but is slow to rev and slow to return to idle. My trusty Champion neon spark tester shows that all cylinders are getting spark without obvious missing or weakness.
I checked for air leaks using propane and found none. The carb balance has also been adjusted to spot on. Checking the plugs reveals that cylinders 1,2 and 4 are very lean with snow white porcelain. Cylinder #3 looks much more normal with some black/brown on the porcelain but no soot or wetness.
Sooo, I pulled the carbs to have another look at them. I drained each bowl in turn and weighed the gas and found them to all hold about 27 grams of fuel. I flipped the carbs over and removed the bowls for an inspection. I see some differences between the four carburetors that I can't understand so I'm hoping that someone here can help me with what I see.
I have circled two orifices that are common to all carburetors. I'll call them orifice #1 and orifice #2. Orifice #1 is round and orifice #2 is oval. The mystery is that they're not all drilled the same in each of the four carburetors.
Here's what I have (X = not drilled, O = drilled):
Carb.......Orifice#1......Orifice#2
#1..............X................O
#2..............X................X
#3..............O................O
#4..............O................X
I'd love to know if this is common to GL1000 carbs and what the reasoning is for the hit-and-miss condition of the orifices shown. Ideas anyone?
(Oh, and yes, I know that there are parts missing off of the carb jets, plug etc., I pulled them out for measurements.)