timing chain help needed! there's slack inbetween the cam gears!?!?

[rh4motorsports]

hello everyone, i just swapped in a sr red top into a 240 for a friend and we fired it up for the first time, and heard a loud rod knock sound, popped the cover and looked didn't find anything the first time

did the noise again,

popped the cover again and found a sweet spot where the chain looses tension in between the cam gears, it's right after the compression stroke on #1&4 cylinders.

it's only for a second, just long enough to hit the guide. also, i took out the tensioner, i believe it's fine, seems to reclick itself to tension.

the thing that's really odd to me, is that on either side of the cam gears going downwards, there's tension, it's only right inbetween them,

almost looks like the intake cam actually stops for a second then get caught back up again, by turning the crank, the exhaust gear rotates, then there's the compression then there's slack in between the gears, then looks like the intake stops turning until the slacks caught back up.

any help would be much appreciated! trying to figure it out, thinking either cam gears or chain, but it's only that one spot, you can also go backwards and it does it that way too....

[Hijacker]

Sounds like a stretched chain to me.

[Geno750]

Could be the tensioner, I had one go bad on a gixxer and it did something similar to what your describing.

98y se-r timing chain tensioner; get this and see if that doesn't fix it, and even if it doesn't this is still good to have, the stock tensioner sucks.