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Author Topic: 350 cc big bore conversion  (Read 3209 times)

Dagra82

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Re: 350 cc big bore conversion
« Reply #30 on: March 14, 2017, 06:38:47 PM »

I already have the cylinders rectified. I have attached the segments to the pistons











.

Now I'm looking for better quality bearings than the ones on this motorcycle
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albertinhouston

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Re: 350 cc big bore conversion
« Reply #31 on: March 27, 2017, 09:56:28 PM »

so this is the 350.. kit in the picture?
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Dagra82

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Re: 350 cc big bore conversion
« Reply #32 on: April 03, 2017, 07:13:13 AM »

I am trying to attach a 58.5 mm diameter piston to the hyosung cylinders.
It's a test . These pistons have less skirt, more cooling holes.
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85fordyota

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Re: 350 cc big bore conversion
« Reply #33 on: April 25, 2017, 07:25:56 AM »

I like the increased displacement.  But for me I'm more interested in the unrichened fuel setup. Could you kinda give a break down on that? Thanks.. 
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Dagra82

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Re: 350 cc big bore conversion
« Reply #34 on: April 30, 2017, 05:41:31 PM »

The original piston of the hyosung has a compression of 22.5 mm and the new piston has a compression of 20 mm.
In order to increase the compression I have removed the gasket from the cylinder and of three I have left a cylinder head gasket.
I already have half engine mounted and for now it looks good.
subefotos

When I have the engine mounted I will do a good run in the engine.
When I finish the writing, I will take it to a professional in Valencia (Spain). When I know the modified gum and the higher or lower needles I will indormare.
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umop-ǝpisdn

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Re: 350 cc big bore conversion
« Reply #35 on: April 30, 2017, 09:08:42 PM »

If you removed the head gasket completely, this is not good, right?

I know it's an oil cooled engine, so no water to worry about, but still, there will be oil passing through between the block and the head.
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I used to be a sensitive, new age guy, but times have changed and now I am more of a caring, understanding, ninties type.

Joss

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Re: 350 cc big bore conversion
« Reply #36 on: May 02, 2017, 09:08:05 AM »

Loving the pics!

If you removed the head gasket completely, this is not good, right?

I know it's an oil cooled engine, so no water to worry about, but still, there will be oil passing through between the block and the head.

I was thinking the same. From my understanding, the head gasket has been kept but not the base gasket (but he said of the three?). Maybe used a smear of goopy stuff?

It must be a safe place judging from the bars on the inside of the windows  ;D
« Last Edit: May 02, 2017, 09:11:01 AM by Joss »
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Dagra82

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Re: 350 cc big bore conversion
« Reply #37 on: May 04, 2017, 04:06:07 PM »

In the cylinder with the carter I have put silver Nural silicone gasket. In the cylinder head, I have placed only one metal joint of o, 25 mm.
I will try to take more photos
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