Hyde
XS650 Addict
Gents, need some help on "tuning" / "post-assembly". Homework submitted for grading below lol. Before we go there, forgive me XS gurus for I have committed the cardinal PMA/CDI/Engine rebuild/Carb Rebuild all at once sin.
82 XS with BS34 Carbs
Symptoms:
-Kickback like a mule
-Left Carb occasional pops back through when kicking
-Choke is non-existent in functionality (rpm increase not present on cold start)
-Throttle cracks required to start
-Choke on after start, bogs and dies
Parts:
Hugh's PMA/CDI/mosfet regulator/new BP7ES plugs (gapped)
2nd oversize rings (end gaps to spec) spaced per Tech section during install
New Valves / Seals / Collets / Tappets / Ground properly to seats
New cam chain / front rail guide
New JBM Intakes - thick new gaskets torqued to 80 in/lbs - sat overnight and re-torqued in morning post compression to be sure of seal
Pandemonium Open pipes - new exhaust gaskets
New Yuasa Battery
New Ramair Foam pods
Carbs Rebuilt by Rick (Oldskool)
Jets - 137.5 & 45
New diaphragms
New brass T linking carbs
Troubleshooting / Reviewed:
Cam Chain adjusted to 1mm push out during rotation
Valves set to 0.003 & 0.006 both sides - 650Twins video viewed 47251338585926 times now lol
Floats 22mm from the body surface (not from gasket) - plastic floats
Rick put in a new float needles - visually inspected each - pristine. Did not check for screens in behind, will do tonight
New gaskets in carbs - hole present and unobstructed for choke. No fuel leaks occurring.
Choke pipe and ports in bowls shows light/spotless
Carb cleaner with choke open passes air and carb cleaner no problem
Carbs Bench Synched - right was closed, left showing light (corrected)
Air/fuel mix - left 2.5 turns, right 2.75, corrected to 3 - understood this will need to be adjusted further up to 3.5
Pilots / main pass air/carb cleaner without a problem
Stock clamps screwed down as far as I can go on Intakes to carbs. I've had the old
Metal intake covers chromed and am unable to get the clamp ends to completly touch, close though.
Static timing - Reinstalled stator, TDC, validated hole in cam right side aligns with plug top and screw hole for plate (straight line).
PMA Marked using prior stator's position for TDC - Timing light shows almost spot on for Fire Mark
Retard a bit - Not as mule'ish as before but bogs out with throttle. Prior setting had crisp throttle response/rev
No issues with hanging throttle, quick returns on throttle release
Pressure from both pipes - both warming/heating up
So there we have it.....I'm "almost" at wits end here and looking to see if there anything I've missed and should dig into while she's still apart. There's 3 things I have not performed yet them I'm aware of:
-air leaks around intake boots to carb body
-the "dark side" - throttle shaft seals
-dreaded compression test to check for a bent valve....the mule disagrees with this conclusion.
I'll review during re-assembly this coming weekend (final harness wiring now). The kickback has the arch of my foot a tad scared and lack of choke perplexed. Throw in a dash of paranoia I'm off a tooth but TDC/Cam disagree. Any input you guys can provide would be gold & insanely appreciated.
82 XS with BS34 Carbs
Symptoms:
-Kickback like a mule
-Left Carb occasional pops back through when kicking
-Choke is non-existent in functionality (rpm increase not present on cold start)
-Throttle cracks required to start
-Choke on after start, bogs and dies
Parts:
Hugh's PMA/CDI/mosfet regulator/new BP7ES plugs (gapped)
2nd oversize rings (end gaps to spec) spaced per Tech section during install
New Valves / Seals / Collets / Tappets / Ground properly to seats
New cam chain / front rail guide
New JBM Intakes - thick new gaskets torqued to 80 in/lbs - sat overnight and re-torqued in morning post compression to be sure of seal
Pandemonium Open pipes - new exhaust gaskets
New Yuasa Battery
New Ramair Foam pods
Carbs Rebuilt by Rick (Oldskool)
Jets - 137.5 & 45
New diaphragms
New brass T linking carbs
Troubleshooting / Reviewed:
Cam Chain adjusted to 1mm push out during rotation
Valves set to 0.003 & 0.006 both sides - 650Twins video viewed 47251338585926 times now lol
Floats 22mm from the body surface (not from gasket) - plastic floats
Rick put in a new float needles - visually inspected each - pristine. Did not check for screens in behind, will do tonight
New gaskets in carbs - hole present and unobstructed for choke. No fuel leaks occurring.
Choke pipe and ports in bowls shows light/spotless
Carb cleaner with choke open passes air and carb cleaner no problem
Carbs Bench Synched - right was closed, left showing light (corrected)
Air/fuel mix - left 2.5 turns, right 2.75, corrected to 3 - understood this will need to be adjusted further up to 3.5
Pilots / main pass air/carb cleaner without a problem
Stock clamps screwed down as far as I can go on Intakes to carbs. I've had the old
Metal intake covers chromed and am unable to get the clamp ends to completly touch, close though.
Static timing - Reinstalled stator, TDC, validated hole in cam right side aligns with plug top and screw hole for plate (straight line).
PMA Marked using prior stator's position for TDC - Timing light shows almost spot on for Fire Mark
Retard a bit - Not as mule'ish as before but bogs out with throttle. Prior setting had crisp throttle response/rev
No issues with hanging throttle, quick returns on throttle release
Pressure from both pipes - both warming/heating up
So there we have it.....I'm "almost" at wits end here and looking to see if there anything I've missed and should dig into while she's still apart. There's 3 things I have not performed yet them I'm aware of:
-air leaks around intake boots to carb body
-the "dark side" - throttle shaft seals
-dreaded compression test to check for a bent valve....the mule disagrees with this conclusion.
I'll review during re-assembly this coming weekend (final harness wiring now). The kickback has the arch of my foot a tad scared and lack of choke perplexed. Throw in a dash of paranoia I'm off a tooth but TDC/Cam disagree. Any input you guys can provide would be gold & insanely appreciated.