Savage x with a f4.6 looses torque after a few minutes of running

[andu]

Engine has plenty of pinch, no airleaks that i'm aware of, slipper is tight, engine isnt overheating. Once warmed up its a wheelie monster,but after a couple of minutes wont even pop a small wheelie, tune doesnt seem to change. Running os8 plug, tried multiple different ones, but the issue persisted, honestly I'm stuck, never had such a problem. Only cause i could think of is an overheating clutch, clutchbell gets quite hot, but not hot enough to start overheating imo and clutchshoes have been ran only for like 5 tanks of fuel.

 

[Vinni]

Engine has plenty of pinch, no airleaks that i'm aware of, slipper is tight, engine isnt overheating. Once warmed up its a wheelie monster,but after a couple of minutes wont even pop a small wheelie, tune doesnt seem to change. Running os8 plug, tried multiple different ones, but the issue persisted, honestly I'm stuck, never had such a problem. Only cause i could think of is an overheating clutch, clutchbell gets quite hot, but not hot enough to start overheating imo and clutchshoes have been ran only for like 5 tanks of fuel.

As the grubscrew in clutchholder backed out ? Therefor putting you strate into 2nd gear ? I add exact same problem mate i put pit o threadlock on grubscrew turned all the way in n backed out 4 full turns ? Ma grubscrew spring n ball bearing add all fell out n wo stuck in grease in bottom of tranns case 👍

 

[andu]

As the grubscrew in clutchholder backed out ? Therefor putting you strate into 2nd gear ? I add exact same problem mate i put pit o threadlock on grubscrew turned all the way in n backed out 4 full turns ? Ma grubscrew spring n ball bearing add all fell out n wo stuck in grease in bottom of tranns case 👍

It still shifts trough both of the gears no problem, so i think the transmission isn't the problematic bit.

 

[Vinni]

It still shifts trough both of the gears no problem, so i think the transmission isn't the problematic bit.

👍so it’s not shifting strait away ? It’s fine for couple mins then loses all its power kinda fing ? Is it just the wheelies or top speed as well ?

 

[andu]

👍so it’s not shifting strait away ? It’s fine for couple mins then loses all its power kinda fing ? Is it just the wheelies or top speed as well ?

Fine for a couple of minutes and then starts not being as snappy on the low end, topspeed remains the same. I took the clutch apart and the housing was a bit glazed, so will clean it up and see what happens

 

[78SavageX4.6]

I have a XTM 24.7 and a Mach 26 that have plenty of pinch while cold or under 200 degrees but once up to temp they lose power and start running poorly or flaming out even when the tune is good. Once cooled down they fire right back up and run well again for a few minutes then back to running poorly. I replaced the piston and sleeve in both and they run great again. I would pull the engine and if you can make it through a complete revolution by hand then you do not have good pinch.

 

[andu]

I have a XTM 24.7 and a Mach 26 that have plenty of pinch while cold or under 200 degrees but once up to temp they lose power and start running poorly or flaming out even when the tune is good. Once cooled down they fire right back up and run well again for a few minutes then back to running poorly. I replaced the piston and sleeve in both and they run great again. I would pull the engine and if you can make it through a complete revolution by hand then you do not have good pinch.

engine has plenty of compression even when warm. fixed the issue, new clutch springs did the trick, my theory is that the old springs would loose their strenght once warmed up by the cltuch and cause earlier engagement and a overheating clutch