sprockets and chain length

[MoYZ]

If I install a 2 or 3 tooth larger rear sprocket on the YZ250, do I need a longer chain?

If a longer chain is required, is it acceptable to lengthen the existing chain by installing additional 1 or more master links, or do I need a new longer chain and then cut it down to the proper size?

Any advice would be appreciated.

 

[SuzookKING]

it would be preferred not to use more than 1 masterlink in a chain. depending on where the adjustment is you might not have to add and any links

 

[Jaybird]

It would depend on the condition of the existing chain. Measure it and see where it is according to pitch growth. If it is more than 1% longer than stock, then adding a new link of any sort could be a bad decision. It would mean that you are running two different pitches....which can cause premature damage and growth to your chain and sprockets. If it's a beater bike, go for it and be sure you connect the new master with the forks going the right way. A master weighs more than a regular link, so physics says it should probably be placed half the chain length away from the other. (not a big deal though)
Before you decide if a longer chain is needed, make sure your adjusters are all the way in.