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Matty
PostPosted: Thu Jun 23, 2005 9:16 am  Reply with quote
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How bad was it? Could you get away with a hone and new rings or do you need a rebore? Any pix?

-Matt
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Egan
PostPosted: Thu Jun 23, 2005 9:17 am  Reply with quote
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Matt, he posted some on the hard seize thread.
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Matty
PostPosted: Thu Jun 23, 2005 9:22 am  Reply with quote
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Wow I totally missed that...

-matt
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Jeff
PostPosted: Thu Jun 23, 2005 9:35 am  Reply with quote
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Scooterworks has the first over pistons. it is 0.4mm larger than stock. I guess I'm a little unsure as to how to procede. Do I get the piston and take that and my cylinder to the shop and have the bore the cyl to match the new piston? Do I trust the spec on the piston and have them bore the cylinder to that? Will the shop know how much to account for the rings? Any advice?


Last edited by Jeff on Thu Jun 23, 2005 9:52 am; edited 1 time in total
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LOREMipsum
PostPosted: Thu Jun 23, 2005 9:42 am  Reply with quote
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Take the piston and the cylinder to the shop and tell them how much overage you want. Derrick recommended .003" for my Lammy.
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Matty
PostPosted: Thu Jun 23, 2005 2:43 pm  Reply with quote
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Are you going to put back on the 20/20 carb? the threads were stripped on the 24 right? Since you aren't doing a pipe or anything i bet you won't notice too much difference between the two..

-Matt
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Jeff
PostPosted: Thu Jun 23, 2005 4:17 pm  Reply with quote
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I haven't decided yet. The threads on the screw are OK and I want to try tapping out the threads on the carb itself to see if I can get it working. If I can fix it I will probably keep it as an intermediate step to a nicer pipe later. In spite of my problems with it the 24G has some advantages, plus I paid a lot of money for it

Anyone know how much clearance I need for a new piston when boring out my cylinder?
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Matty
PostPosted: Thu Jun 23, 2005 4:28 pm  Reply with quote
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I'd call Hodge at Scooterworks and ask what the tolerance should be, maybe he could measure what it is on a new kit.

-Matt
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Jeff
PostPosted: Thu Jun 23, 2005 4:35 pm  Reply with quote
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I'll do that. I noticed something interesting about my old piston last night. The piston diameter at the top of the piston just below the rings is 63.0mm. Right to specification. At the bottom of the piston the diameter is 64.0mm is this normal or is this another aspect of the damage from my seize?
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Matty
PostPosted: Thu Jun 23, 2005 4:40 pm  Reply with quote
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That sounds right, Derrick or Brooke know more than I, but they aren't the same size all the way down. You have to be carefull where you measure it, same with the cylinder.

-Matt
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Brooke
PostPosted: Thu Jun 23, 2005 6:07 pm  Reply with quote
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Matty wrote:
That sounds right, Derrick or Brooke know more than I, but they aren't the same size all the way down. You have to be carefull where you measure it, same with the cylinder.

-Matt


That's normal. The top of the piston gets much hotter so it expands more and made a bit smaller than the skirt.

I'd just get the OS piston and bring it in to Aaron. Get a spec from hodge, but Aaron may thing that's a bit loose. I split the difference between what he thought was right and what Rob told me and it turned out fine. I'd trust the machinist. He does a lot of two stroke cylinder work and does it well.
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Jeff
PostPosted: Thu Jun 23, 2005 6:18 pm  Reply with quote
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Easy enough, thanks Brooke!
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Jeff
PostPosted: Sat Jun 25, 2005 4:43 pm  Reply with quote
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well I pulled the 24G out and tapped out the hole for the air mixer screw. I think I fixed it. The screw is in and perpendicular to the carb. The real problem was that the 24G is just a little too big to install in the stella air box with the screw in place, so I had installed the carb without it. Trying to seat that screw properly through the access port on the rear of the airbox is almost impossible.

My remedy is to install the screw first and dremel the airbox to make way for the screw as the carb is being put in place. I had to take about 1mm off the top of the inner threads of the box. No problem. The plastic cap fits just fine after the modification and the carb fits too.

While I was at it I modiffied the 24G air filter so that it can accomodate the taller standard jet stacks. That gives me access to a wider selection of mixer tubes and jetting options.

Now all I need is my new piston.
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scootervillain
PostPosted: Sat Jun 25, 2005 9:26 pm  Reply with quote
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We have typically had Aaron do them .04 over the piston. You want to break it it in nice and easy!
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scootervillain
PostPosted: Sat Jun 25, 2005 9:28 pm  Reply with quote
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Whoops. Make that .004. Bit of a difference, you know.
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