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Author Topic: Two stroke piston showdown.  (Read 15677 times)

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Offline 2T Institute

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Two stroke piston showdown.
« Reply #45 on: August 25, 2012, 10:20:12 PM »
0.1 isn't 0.2 and might at the top of the piston but not at the bottom of the skirt where it is full size.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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Two stroke piston showdown.
« Reply #46 on: August 26, 2012, 08:08:13 AM »
For the fifth time: A .2 mil gauge fits between my piston and the cylinder bore. This also makes sense when you consider the piston slap and next-to-no compression
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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Two stroke piston showdown.
« Reply #47 on: August 26, 2012, 08:10:27 AM »
Sorry Stu but you shouldn't be trying to measure your bore with feeler gauges.
If you have a friendly machine shop close by they should be able to measure your bore for you for free.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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If you don't fall off you are not going hard enough

Offline Stusmoke

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Two stroke piston showdown.
« Reply #48 on: August 26, 2012, 08:58:35 AM »
Quote from: TMKIWI on August 26, 2012, 03:10:27 PM
Sorry Stu but you shouldn't be trying to measure your bore with feeler gauges.
If you have a friendly machine shop close by they should be able to measure your bore for you for free.

No no, I'm not trying to measure my bore with feeler gauges haha. God no. No thats all sorted I've got the piston ordered and paid for should be here sometime this week. I was just gauging how rooted the piston thats in there was and was looking for reasons as to why the airbox makes a whistling noise through the compression stroke
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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Two stroke piston showdown.
« Reply #49 on: August 26, 2012, 09:51:44 AM »
Quote from: Stusmoke on August 26, 2012, 03:08:13 PM
For the fifth time: A .2 mil gauge fits between my piston and the cylinder bore. This also makes sense when you consider the piston slap and next-to-no compression

My (3 sets) 0.2mm feelers do not bend, so I'm wondering how you push a piston past something that will not bend or conform to the shape of the bore?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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Two stroke piston showdown.
« Reply #50 on: August 26, 2012, 10:46:12 PM »
Quote from: 2T Institute on August 26, 2012, 04:51:44 PM
Quote from: Stusmoke on August 26, 2012, 03:08:13 PM
For the fifth time: A .2 mil gauge fits between my piston and the cylinder bore. This also makes sense when you consider the piston slap and next-to-no compression

My (3 sets) 0.2mm feelers do not bend, so I'm wondering how you push a piston past something that will not bend or conform to the shape of the bore?

Mine bend just enough to fit between them.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline cnrcpla

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Two stroke piston showdown.
« Reply #51 on: August 26, 2012, 11:12:59 PM »
Quote
Mine bend just enough to fit between them.
Your lucky you didn't scratch the bore squishing metal between metal.  :o
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline _X_

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« Reply #52 on: August 27, 2012, 12:17:16 AM »
man do you all ride or just use calculators and shove feeler gauges in and out of your bikes motor? ha! you guys kill me with this stuff.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline msmola2002

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Two stroke piston showdown.
« Reply #53 on: August 27, 2012, 02:24:12 AM »
Yeah, totally.

Measure once, cut twice and like wait for the rod to go through the side of the cylinder over a double cos the the clearances were wrong :p
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline _X_

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« Reply #54 on: August 29, 2012, 11:19:37 PM »
remember to revvvvv that sucka! HA!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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« Reply #55 on: August 30, 2012, 09:01:07 AM »
In a way I'm glad I got the 250 first. Sort of I mean it sort of numbed me to the brutal thrust of the powerband being hit so I shouldn't have any problems wringing this bikes neck. And wrung it shall be. Anyway as the first part of the break in procedure that Motocrossparts sent me with the piston I warmed her up and look it for a 10 minute down the road at around 50% throttle. I might have underrevved it though but hopefully it the mating wont be too flat.

 Anyway one thing I noticed when I was turning it was how insanely responsive it was to a turn of the wheel. Almost too responsive it was VERY different to my YZ. I'd say its cos of the steeper head angle but I'll get used to it. Tomorrow I'll finish the second half of my break in and then may god have mercy on this 125... Cos I won't
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline _X_

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Two stroke piston showdown.
« Reply #56 on: August 30, 2012, 09:51:33 PM »
stu thats hondas 125 blessing to you. they handle like none before. I have an 03 and there is no where on the track i can't go. inside ? yup got that. rail the outside got that too. through the roughest line no problem over a tripple out of a turn? double-single.HA! no really they handle that good.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline scotty dog

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Two stroke piston showdown.
« Reply #57 on: August 31, 2012, 09:22:12 AM »
Good to hear ya got her goin Stu, have ya still got the YZ? Pictures of the 125?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline Stusmoke

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Two stroke piston showdown.
« Reply #58 on: September 01, 2012, 06:09:59 AM »
No pictures yet. I punctured the front tube with a screwdriver while swapping the tires over with a set a bridgestones M203s. Lets see how they go in the black soil :P Anyway I didn't get around to finishing the break in but I'm close. It wouldn't have mattered whether I finished it or not no way I could've ridden I hurt myself playing rugby at school. Anyways a bit of bad luck on two fronts there but stuff happens. At least I got the rear tire on without any punctures but I don't think I could have if I tried I've seen tractor tubes that weren't as thick as that.

Pictures tomorrow arvo hopefully I'll get a new tube and sort it all out.

And yes I still have the YZ. I'll ride this 125 until the holidays when I'm hopefully getting a job then sell the 250. 250 is gonna be my backup bike incase this one grenades but it shouldn't.

Thanks again to those who helped me out.

Stu
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TMKIWI

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Two stroke piston showdown.
« Reply #59 on: September 01, 2012, 07:25:25 AM »
Best you swap your screw driver for some tyre levers Stu. ;)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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If you don't fall off you are not going hard enough
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