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81 GS650g intermittent bogging
hey there,
im looking for some opinions on my bike.
recently (last 50 miles ish) the bike seems to be starving of fuel. but only intermittently. typically goes like this,
start bike, starts right up with a small bit of choke and then as soon as it starts to come up a bit in rpms i lower choke and let it warm up just a little.
start off down the backroad i live on and when i hit the straight i start to lay into it from a stop, 1st 2nd are fine typically and pull and i feel no hesitation.
3rd is usually where i start to feel some hesitation as if it's running ok (no sputtering or anything) but down on power and it kicks in with dropping cylinders it almost feels like as the motor starts to make instead of it's inline 4 rev'sness more of a "bog bog bog bog" sound as if it's not firing or maybe flooding out? it does this all the way up to 5th and more so in 5th under load it would seem.
it doesnt die out and im fairly sure it's not running lean. if i let off gas and coast for a bit i can pick it back up and it will pull then hesitate and sometimes it just straight pulls all the way through with no problems.
now, in the last 50 miles the only work ive done was new clutch springs and oil, and i reseated the exhaust (if anything this would have changed AFM) as in the PO stripped out bolts so the exhaust hadnt been seated to the block of the bike so i put studs in and it's now flush so instead of only putting 60% of exhaust through the tubes it's hopefully putting 100% (ran fine initally after doing exhaust for like 10 miles) i speculate that PO ****ed with carbs to make it run ok like that, so when i took them apart i put back to stock settings where available. (all jets were stock and needles when i opened them)
list of things checked and results
plug chop reveals im running just a smidge rich if anything, really want to do another one and cut engine while it's bogging to see if that shows anything more
fuel delivery to carbs is good as that is 1st thing i replaced was a solid line direct to carbs as the tank has a finer mesh then any filters i was using.
took carbs out (5 times) adjusted floats and did a "cleaning" (1 full can of carb cleaner in a rubber maid and blasting every part i could and through every hole to remove dirt with them taken apart but not seperated)
everything was stock settings (stock bike also with stock foam filter and exhaust)
petcock is totally cleaned and reassembled and runs same on prime as on vacuum side.
took side cover off and stator has the spring it's supposed to (not sure on that was just told to check but i have no idea if i did it right)
things i want to test when i head back to where the bikes at.
open float bowls and put petcock on prime and see the constant flow into the carbs to see if it's just not flowing into the bowls right.
swap ignition coils (they both tested out to 4.6 ohms which appearently is within range?) to see if it switches sides
starter fluid mist around the airbox for leaks.
run with no tank top to eliminate a vacuum lock.
any other ideas, tests i could do please let me know.
im looking for some opinions on my bike.
recently (last 50 miles ish) the bike seems to be starving of fuel. but only intermittently. typically goes like this,
start bike, starts right up with a small bit of choke and then as soon as it starts to come up a bit in rpms i lower choke and let it warm up just a little.
start off down the backroad i live on and when i hit the straight i start to lay into it from a stop, 1st 2nd are fine typically and pull and i feel no hesitation.
3rd is usually where i start to feel some hesitation as if it's running ok (no sputtering or anything) but down on power and it kicks in with dropping cylinders it almost feels like as the motor starts to make instead of it's inline 4 rev'sness more of a "bog bog bog bog" sound as if it's not firing or maybe flooding out? it does this all the way up to 5th and more so in 5th under load it would seem.
it doesnt die out and im fairly sure it's not running lean. if i let off gas and coast for a bit i can pick it back up and it will pull then hesitate and sometimes it just straight pulls all the way through with no problems.
now, in the last 50 miles the only work ive done was new clutch springs and oil, and i reseated the exhaust (if anything this would have changed AFM) as in the PO stripped out bolts so the exhaust hadnt been seated to the block of the bike so i put studs in and it's now flush so instead of only putting 60% of exhaust through the tubes it's hopefully putting 100% (ran fine initally after doing exhaust for like 10 miles) i speculate that PO ****ed with carbs to make it run ok like that, so when i took them apart i put back to stock settings where available. (all jets were stock and needles when i opened them)
list of things checked and results
plug chop reveals im running just a smidge rich if anything, really want to do another one and cut engine while it's bogging to see if that shows anything more
fuel delivery to carbs is good as that is 1st thing i replaced was a solid line direct to carbs as the tank has a finer mesh then any filters i was using.
took carbs out (5 times) adjusted floats and did a "cleaning" (1 full can of carb cleaner in a rubber maid and blasting every part i could and through every hole to remove dirt with them taken apart but not seperated)
everything was stock settings (stock bike also with stock foam filter and exhaust)
petcock is totally cleaned and reassembled and runs same on prime as on vacuum side.
took side cover off and stator has the spring it's supposed to (not sure on that was just told to check but i have no idea if i did it right)
things i want to test when i head back to where the bikes at.
open float bowls and put petcock on prime and see the constant flow into the carbs to see if it's just not flowing into the bowls right.
swap ignition coils (they both tested out to 4.6 ohms which appearently is within range?) to see if it switches sides
starter fluid mist around the airbox for leaks.
run with no tank top to eliminate a vacuum lock.
any other ideas, tests i could do please let me know.
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