Red Head Block Cracks

Blkhwkbob

Blkhwkbob

VIP Member
Joined
Jun 3, 2003
Messages
343
Age
62
Location
Des Plaines, Il.
So does anybody know why so many red head engines crack around the pull start? Has there been discussion about this? It is obviously a very common problem.
 
yes i would also like to know i have been hearing more and more guys having this problem should i replace my crank bearing now while my redhead is running strong
 
pops said:
yes i would also like to know i have been hearing more and more guys having this problem should i replace my crank bearing now while my redhead is running strong
Click to expand...

I would change the mag side bearing, even if it is running strong. Mine went out with no warning. Sure sucks replacing pistons,jugs and heads and having crank work done.
 
stein700sx said:
I would change the mag side bearing, even if it is running strong. Mine went out with no warning. Sure sucks replacing pistons,jugs and heads and having crank work done.
Click to expand...
I agree 100%. I would have the update done also.
 
How is it that the replacing the bearing prevents the case from cracking?? I have an 01sxr700 could this happen to me?
 
No, the two are unrelated, however, AFTER you lose your mag side bearing on a 97 sx, you will find the cracks as you pull the engine apart! The 97 sx had a problem with a lack of oil getting to the mag side bearing. It was corrected later. Your 01 is ok.

I have no idea what causes the cracks in the cases, but THAT problem is not limited to just the 97's. I have a newer block that has cracks, too.
 
I have a 99 sx 600, and it looks good with 5000 miles, but I will maybe work on it next summer....Did the 99's have this issue also...?

By the way how is that crank and case I sent you.....? Looks like brand new doesn't ?

Nick
 
Blkhwkbob said:
The 97 sx had a problem with a lack of oil getting to the mag side bearing.
Click to expand...

also, they had a crappy little ball bearing, like polaris uses. in '98 they went to the nice large roller bearing. also, the oiling groove got changed i believe.
 
Last edited by a moderator:
Do you have to change the bearing if you take the motor apart?...Is it ok to still run the old style?
 
Yes . You have to take the crank out and press off the bearings.
Its still OK to run the old style but a little work and you have the new style in and you do not have to change it in the next 2000 miles or so
 
Nicko said:
I have a 99 sx 600, and it looks good with 5000 miles, but I will maybe work on it next summer....Did the 99's have this issue also...?

By the way how is that crank and case I sent you.....? Looks like brand new doesn't ?

Nick
Click to expand...

Check PM's.
 
You must log in or register to reply here.


Back
Top