broken Pin K90

[CConrad]

Hello,

yesterday i broke the wristpin in my K90 ( SG Eagle 80, running in the good 90s ). The piston and the upper bushing of the rod is also damaged.

My question: Do you know, if there is an general problem? When it is so, how to fix? Or was this just "**** happens" ?

Greets from Germany

Curt

 

[Don Ferrette]

Hello,

yesterday i broke the wristpin in my K90 ( SG Eagle 80, running in the good 90s ). The piston and the upper bushing of the rod is also damaged.

My question: Do you know, if there is an general problem? When it is so, how to fix? Or was this just "**** happens" ?

Greets from Germany

Curt

Curt ,welcome to the world of Kalistratov. The K90's are really strong running motors but the weak link is the wrist pin. If you can find some Rossi 90 wrist pins they are a direct fit (5.98mm x 22.4mm) & much stronger. If you can find some over there please let me know as I still need a few more. :unsure:

 

[CConrad]

Thank you very much for your quick answer, Don. I will try to get some and let you hear, when i found some more!

Curt

 

[NITROSNIFER]

If you can't find any for the 66R90 marine the ducted fan is the same motor. I will check my parts sheet and

get you the #'s

 

[Don Ferrette]

If you can't find any for the 66R90 marine the ducted fan is the same motor. I will check my parts sheet and

get you the #'s

How about just gettin' some for us if you have a source. B)

 

[NITROSNIFER]

Part # is 6607 I will contact the peeps I have had good luck with and see if I can find some for you.

 

[Don Ferrette]

Part # is 6607 I will contact the peeps I have had good luck with and see if I can find some for you.

Very cool, thanks in advance! When you check see if you can verify them being 5.98mm x 22.4mm.

 

[EatMyShortsRacing]

Although I dont run K engines I have been trying another way into Rossi to see whether they still have pins.

Will let you know how I go...

(cant have Tim crying on my shoulder all the time... )

 

[Tim_Duggan]

I ran an OPS pin in my K67 this weekend just gone. They are 5.98mm diameter also.

I have a Rossi pin for my K90 (thanks Craig). Need one more for my K82 as they are the same bore as the K90.

My last Kalistratov pin failure (the newer type) took out piston / head / sleeve /rod, chipped the rotor housing and sent shrapnel into the bearings.

Curt,

I'm running the same boat / motor combination currently - would you mind sharing what pipe and prop are you running?

Tim.

 

[EatMyShortsRacing]

Hmmmmm should check the "A" pin diameter one day...

 

[Tim_Duggan]

Hmmmmm should check the "A" pin diameter one day...

I think they are different - and have needles on the little end?

 

[Ian Inverarity]

The A-90 wrist pins are 1mm larger in diameter and are stepped one end. Wont fit! h34r:

Ian.

 

[EatMyShortsRacing]

The A-90 wrist pins are 1mm larger in diameter and are stepped one end. Wont fit! h34r:

Ian.

He lives!!!!!

I do know of one more Rossi 90 pin in existance but it is in an engine... A CMB ABC 90!!! with EVO rear plate...(yes it is a Rossi piston/liner...)

How about the OS 90 pin???

I have an OS 90 VR DF piston / liner at home (brand new) that I can measure up...

 

[Tim_Duggan]

Why not? Could be another alternative. I've never heard of them breaking the pin - just the rods :lol:

 

[CConrad]

- would you mind sharing what pipe and prop are you running?

Tim.

No problem! I use an H31 made by Andy Brown and the original kalistratov pipe, the aluminium type. Length: 29 -30cm.

Curt

 

[Don Ferrette]

- would you mind sharing what pipe and prop are you running?

Tim.

No problem! I use an H31 made by Andy Brown and the original kalistratov pipe, the aluminium type. Length: 29 -30cm.

Curt

Curt, any luck with finding the Rossi 90 wrist pins on your end yet?? :unsure:

 

[CConrad]

Hi Don,

'til this moment, no! , but i have a lot of friends, modelboaters in Europe and all of them are searchin for me. My Italian friends ( Ale Oldini and others) are searching in Italy.

If i get some, for shure i let you know!

We'll see!

Curt

 

[ALLAN YUEN]

Hi Don,

'til this moment, no! , but i have a lot of friends, modelboaters in Europe and all of them are searchin for me. My Italian friends ( Ale Oldini and others) are searching in Italy.

If i get some, for shure i let you know!

We'll see!

Curt

Curt Why not use OPS 90 wrist pin will fit or cut by lathe machine? any lucky?

 

[Don Ferrette]

Hi Don,

'til this moment, no! , but i have a lot of friends, modelboaters in Europe and all of them are searchin for me. My Italian friends ( Ale Oldini and others) are searching in Italy.

If i get some, for shure i let you know!

We'll see!

Curt

Curt Why not use OPS 90 wrist pin will fit or cut by lathe machine? any lucky?

The length can be changed if too long but the diameter must be exact. You cannot reduce diameter or you will ruin the hardening of the pin. It is also for the same reason you cannot fit a 6mm MAC84 pin as the K rod is hardened & boring the small end will have the same negative affect on the hardening. h34r:

 

[Terry Keeley]

Why not see if anyone here can get some made?