Cylinder

[Tony]

Hey guys!

Just make a deal with a guy, and he gave me this 61x Cylinder , Bored to 84 mm .... See and tell me what you guys think ... He said me that was bored by riva, and has a lot more to run with this pistons ...

Can i put in my 62t case with this pistons and run nice withou problems ?? I have two new pro-x 84 mm pistons here...

Thanks by the way

Tony

 

[Tony]

pistons

 

[Kennay]

61x bigbore... alot of scoring, and alot of deto at the exhaust port

No way I'd run that. It needs a fresh bore (Maybe a hone) and some new pistons, but that is simply my opinion.

 

[DAG]

if those are the stock sleaves and he bored them to 84mm, they are VERY thin. Most 84 are resleaved.

 

[Kennay]

Doubt Riva would bore it to 84 on 61x stock sleeves.... seems like they would know better

 

[Tony]

You think its better to re-sleeve ??

 

[brentR]

run it til it blows up

 

[DAG]

run it til it blows up

thats what i was thinking, how new is your crank,, if its a few years old, i'd just run it till it poped... who knows sometimes they will last awile like that:dunno:

 

[Kennay]

thats what i was thinking, how new is your crank,, if its a few years old, i'd just run it till it poped... who knows sometimes they will last awile like that:dunno:

That sounds like a good way to completely ******** up your entire setup. I'd go ahead and just send it to a good shop, and let them hone it measure it bore it whatever and get some new pistons and not worry about it.

By the time you save money by just running it, you could make your crank ******** the bed and take out the cases, starter, sleeves, cylinder itself, ect.... and then be totally back at square one. Spend the 250-300 now and don't worry about it again for a while.

 

[Liquid Force]

That sounds like a good way to completely ******** up your entire setup. I'd go ahead and just send it to a good shop, and let them hone it measure it bore it whatever and get some new pistons and not worry about it.

By the time you save money by just running it, you could make your crank ******** the bed and take out the cases, starter, sleeves, cylinder itself, ect.... and then be totally back at square one. Spend the 250-300 now and don't worry about it again for a while.

I agree, spend a little now or alot later... If you can't feel any deep "knicks" in the bore it "might" hone up ok, then slap some fresh pistons in it, that would be best case/cheapest option

 

[Tony]

OK ... But it has to be 84,25 mm pistons right ???

I take this cylinder because it was a good deal ...

 

[Kennay]

if it was cheap, it was a good deal, the pistons are trashed though

If you are unsure on size, you need to just send it off. Ideally, they need to be measured for the bore to be spot on anyway.

 

[Kennay]

Art at Jetworks

1-949-548-5259

 

[Tony]

Understand... I was asking for the size because i have to brand new 84 mm pro-x here ... beacuse if its 84,25 i will have to buy two other pistons ...

 

[Kennay]

yes you will, unless you buy new sleeves, which might not be the wrong route to go if those are stock sleeves. For about the cost of pistons, you can replace the sleeves with some real 760 sleeves from NW and keep the bore at 84, that way you have more room for new bores and what not in the future

 

[Tony]

Yeah ! that´s right... I will wait my 701 blow up, and than i put this cylinder , with new sleeves, pistons, connecting rod kit, and A.D.A head with 38 cc domes...

Thankss

 

[Kennay]

Sounds like a plan.

 

[Matt_E]

Doubt Riva would bore it to 84 on 61x stock sleeves.... seems like they would know better

GroupK bores them to 84mm and states they can be bored to 84.5.

I have talked to people that ran them to 85.

Not saying I'd do that, but 84 isn't the end of the cylinder as it's often portrayed.

 

[Kennay]

Well then. That is good to know fo' sho'

 

[accbr]

I talked to a few builders when I was looking at big bores last year. Chuckie at Team Scream said he wouldn't bore a 61x cylinder to 84mm. Paul Lehr said the same thing. CG racing said they wouldn't do it either. Jetworks wouldn't do it. Harry Klemm at Groupk said it was okay to do on a 'recreational' motor. I ended up getting a resleeved big bore.:shrug: