Port the cylinder or just play it safe ?,

[CARBONX2]

Some advice: A well ported cylinder needs a girdled head or else the cylinder will snap from hp

 

[jo5hi3]

Some advice: A well ported cylinder needs a girdled head or else the cylinder will snap from hp

 

[2HIGH4U]

I'm going on three or so years on my jetmaniac/blue ported cylinder and it's still going really strong ,it gets beaten up in the Australian surf ,I've never heard anyone over here say a bad word about Chris or blue ,top guys to deal with

 

[CARBONX2]

View attachment 318623

Then your engine has the strength of those old gals, lol

 

[jo5hi3]

Then your engine has the strength of those old gals, lol

Incorrect, you run a girdled head on the x cylinder so the casting doesn't crack. Even if you have a 61x cylinder that isn't ported, it can crack. If you run a 62t cylinder, then a girdled head is not necessary. So in summary, you don't run a girdled head because the cylinder is ported, you run a girdled head because the casting is weak and has potential to crack.

 

[INDebtSJ]

Is it more prone to crack when you increase the compression?

 

[CARBONX2]

Increased compression or porting results in more hp. All those cylinders will snap, and when I say snap, it will sound like a gunshot. 61x will snap just revving it on the trailer, 1st hand experience. 62t and 64u will take more hp, but will do similar. How many of you cracked the Riva domes while riding? Another expensive lesson and no the pistons didn't touch the domes. HP and the results vibrations breaks parts. Even 66E and 66V cylinders need girdled heads when porting/race fuel.

 

[DezKnotz]

I'd be looking for more of a mid to top end set up ,

 

[Jyzmbe]

Jetmaniac and Blue are easy to get ahold of and respond quickly. I messaged cpt in March and still haven't received a response.


Sent from my iPhone using Tapatalk

 

[Vumad]

ok so I have a 09 superjet that I just lost my first rope end on. I'm going to fix it quick bu not sure of I want to do any porting or just keep it stock with a fresh top end , I now have a young child and and have less and less time to ride so I want to ride not wrench . I'm running a b pipe with an ada head now and not sure what to do. Any suggestions on who to use if I did the porting road and what the cost and performance gain would be ? Any help or thoughts would be appreciated

I didn't read any of the replies but I don't feel that porting and playing it safe are mutually exclusive. I believe certain companies are reputable enough to consider their port work in the realm of "safe". @Blue @JetManiac pop into mind without hesitation.

 

[Jyzmbe]

I don't know why people think porting sacrifices so much reliability. It's a 2 stroke. Port it


Sent from my iPhone using Tapatalk

 

[D-Roc]

Because if you remove material from the casting to port a cylinder, it weakens the cylinder. On mild port jobs not a big deal, but if you running +800cc on a 61x cylinder, it needs to be properly ported to make it flow and for that cc, it's a lot of material to remove and that makes it weak. Girdled or not, it has a higher chance of cracking from the abuse we tend to put our skis through. I still would port it. It's worth the risk.


Dirty River Rider

 

[Jyzmbe]

Because if you remove material from the casting to port a cylinder, it weakens the cylinder. On mild port jobs not a big deal, but if you running +800cc on a 61x cylinder, it needs to be properly ported to make it flow and for that cc, it's a lot of material to remove and that makes it weak. Girdled or not, it has a higher chance of cracking from the abuse we tend to put our skis through. I still would port it. It's worth the risk.


Dirty River Rider

It's an 09 sj. I assume it's a stock 61x/62t. Not like he's trying to feed a beast


Sent from my iPhone using Tapatalk

 

[CARBONX2]

Because if you remove material from the casting to port a cylinder, it weakens the cylinder. On mild port jobs not a big deal, but if you running +800cc on a 61x cylinder, it needs to be properly ported to make it flow and for that cc, it's a lot of material to remove and that makes it weak. Girdled or not, it has a higher chance of cracking from the abuse we tend to put our skis through. I still would port it. It's worth the risk.


Dirty River Rider

As long as the sleeves are not replaced with a bigger ones, a girdled setup will keep it together

 

[masterblaster]

adding a 4 mill crank and case porting while its apart and sending parts,is well worth it for budget power

 

[DezKnotz]

Have a ada girdled head set up

 

[air blair]

this is what happens without a girdled head. Factory pipes lay all their weight on one side, add some hard lands and failed rolls. Granted it took some time to get that bad. But if you see the porting that's blues work. My bad on no girdle kit


Sent from my iPhone using Tapatalk