i have a question

[born2sled]

i was wondering when people say crank pinned and welded what exactly is done when applied and how does it benefit just curious

 

[FTXMOTORSPORTS]

Its a practice thats been around a long time, necessary in some applications and opinions will vary.2 stroke cranks are assembled with press fits between the lobes and rod pins. In certain applications or in the case of poorly assembled cranks/bad tolerences, the crank can go "out of phase" which is when the lobe twists on the pin. this throws that cylinder out of time which will create runability problems(or won't run)and can lead to motor damage.vibration/harmonics issues can also show up.To fix it(or band aid it depending on opinion) some will drill through the lobe and rod pin to insert a pin or key as well as Tig welding the end of the rod pin to the crank lobe. All in an effort to keep the crank components from moving in relation to each other.

 

[born2sled]

Its a practice thats been around a long time, necessary in some applications and opinions will vary.2 stroke cranks are assembled with press fits between the lobes and rod pins. In certain applications or in the case of poorly assembled cranks/bad tolerences, the crank can go "out of phase" which is when the lobe twists on the pin. this throws that cylinder out of time which will create runability problems(or won't run)and can lead to motor damage.vibration/harmonics issues can also show up.To fix it(or band aid it depending on opinion) some will drill through the lobe and rod pin to insert a pin or key as well as Tig welding the end of the rod pin to the crank lobe. All in an effort to keep the crank components from moving in relation to each other.

thanks for the info

 

[born2sled]

Its a practice thats been around a long time, necessary in some applications and opinions will vary.2 stroke cranks are assembled with press fits between the lobes and rod pins. In certain applications or in the case of poorly assembled cranks/bad tolerences, the crank can go "out of phase" which is when the lobe twists on the pin. this throws that cylinder out of time which will create runability problems(or won't run)and can lead to motor damage.vibration/harmonics issues can also show up.To fix it(or band aid it depending on opinion) some will drill through the lobe and rod pin to insert a pin or key as well as Tig welding the end of the rod pin to the crank lobe. All in an effort to keep the crank components from moving in relation to each other.

what is and how can you tell if your sled has a harmonic issue

 

[winter brew]

what is and how can you tell if your sled has a harmonic issue

Excessive vibration, breaking primary clutch springs, breaking exhaust springs often.