timimg number differenses between XMv1 and XMv2 outboards?

This off topic but I think we have answered the timing question so about the crank and P/S fit, back when I got my first air cooled O/S outboard engine I saw that there was no hole for rod bushing too. I wondered why they would leave it out and thought that they should not have removed it but I have not had a bushing failure and have not heard of any problems outside of an expected or typical amount of wear.

I have seen the "out of the bag P/S fit" loosen up as well and hoped that it was just a batch related QC issue but the removed oil hole and loosened P/S fit came along about the same time. Was this P/S fit adjusted intentionally by O/S due to the missing oil hole and less oil getting to the rod bushing during break in?  Who knows? With no part failures the engine is still very reliable but the light fit will break in fast (within 3 to 5 tanks of fuel) and will not stand many sags in the corners.  I would advise people who mix there own fuel not to go too light on your oil content with these light fit P/S sets. Hopefully we will see the fit tighten up a little bit soon.

In a perfect world, I like my "out of the bag" piston to tighten up just short of the top of the sleeve when pushed through by hand. These light fit P/S engines are very fast you just need to be aware that the fit is quite fragile and don't use up all of your needle unless you really need to.

-Carl

Bill Britton said:

Those are the RG piston sleeves. If you have a stock of them I would hoard them like a mofo...  h34r:

Click to expand...

Are you running the RG P/S  on the XM engine?

Joern Markset said:

Are you running the RG P/S  on the XM engine?

Click to expand...

Nope. I don't have any RG piston and sleeve's. Besides, that wouldn't be legal...  h34r:

Bill Britton said:

Nope. I don't have any RG piston and sleeve's. Besides, that wouldn't be legal...  h34r:

Click to expand...

Was just wondering if anyone does (after reducing the sleeve OD)  It is legal for me

Joern Markset said:

Was just wondering if anyone does (after reducing the sleeve OD)  It is legal for me

Click to expand...

Joern,

Our Sport B rules are as follows:

IMPBA- as long as the displacement remains .21, you can put whatever piston and sleeve inside that engine that you want as long as the appearance on the outside of the engine does not change.

NAMBA- Only the original OS Vl or Vll part number piston/sleeves are allowed. Use of any other piston/sleeve would be illegal

RonShaw said:

Joern,

Our Sport B rules are as follows:

IMPBA- as long as the displacement remains .21, you can put whatever piston and sleeve inside that engine that you want as long as the appearance on the outside of the engine does not change.

NAMBA- Only the original OS Vl or Vll part number piston/sleeves are allowed. Use of any other piston/sleeve would be illegal

Click to expand...

I’m aware of your rules, Ron. Was just curious if any gained som power by using another P/S. 

Anyway I will look into it just for fun. Our rules are quit open, only displacement is measured. But we have another BIG handicap, maximum 25% nitro.... (rules made by the government, applies to every single soul in Norway)

Joern Markset said:

I’m aware of your rules, Ron. Was just curious if any gained som power by using another P/S. 

Anyway I will look into it just for fun. Our rules are quit open, only displacement is measured. But we have another BIG handicap, maximum 25% nitro.... (rules made by the government, applies to every single soul in Norway)

Click to expand...

Wow 25%. Yes thats a tough one but I have seen winning boats here in the US win on less nitro than that!!... Good luck. 

Hi all new to this forum really like what I see does anybody know where I can get a p/s for the 7.5 red head