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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: Search


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Vintage Japanese Motorcycle Owners Group Forum Index
Author Message
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Wed Oct 18, 2017 12:17 pm   Subject: Cold compression values, T20?
Rods were certainly replaced, as were all the main bearings. I don't know for sure about the big end bearings but it would have been crazy not to replace them whilst it was apart so I assume they were ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Wed Oct 18, 2017 4:04 am   Subject: Cold compression values, T20?
You have been very helpful, and its much appreciated!

The crank was picked up yesterday and is on its way back to the crank builder. I suspect that the new big ends have failed or were not up to sp ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Mon Oct 16, 2017 1:54 pm   Subject: Cold compression values, T20?
Thanks for the thought. Its about 75 miles which for you guys is nothing but for us is about two hours of traffic! I had a quick look at the site and they mention doing modern machinery rather than cl ...
  Topic: couple of things on T20
fodder

Replies: 11
Views: 372

PostForum: Suzuki   Posted: Sun Oct 15, 2017 8:57 am   Subject: couple of things on T20
I had a look at my cap today and poked around in the holes. Seems like they were clear but when the sides of the bung are pushed in the holes close up. As my bung is quite a tight fit in the tank I ca ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Sat Oct 14, 2017 8:45 am   Subject: Cold compression values, T20?
Thanks for the thoughts. Feel free to question my measuring techniques, its over thirty years since I've been inside a 2-stroke engine and I was a novice then too!

I think if I was getting the sam ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Thu Oct 12, 2017 1:52 pm   Subject: Cold compression values, T20?
Thanks, thats helpful again.

Just 3mm movement would be very nice! Even without a dial gauge its very obvious that there is more movement than that on mine.

You're right, I'm sure, the gunge pr ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Thu Oct 12, 2017 1:03 am   Subject: Cold compression values, T20?
What sort of things could have gone wrong on the rebuild, to have caused that? If it was an error I really don't want it repeated next time Shocked

There is no damage to the piston, and the rod looks ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Wed Oct 11, 2017 1:42 pm   Subject: Cold compression values, T20?
Thanks for the offer, much appreciated. Adrian will also come over and take a look, he's as keen as me to get this sorted.

Yes, hard to know whats going on. I have just been looking at it again an ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Wed Oct 11, 2017 12:20 pm   Subject: Cold compression values, T20?
Your rod issue sounds bad and it makes me suspect that your engine was not asembled correctly.

I'm as certain as I can be that the engine was assembled correctly, as I watched, and helped a little ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Wed Oct 11, 2017 1:33 am   Subject: Cold compression values, T20?
Thanks, I'll have a closer look but I think it is a solid pin.

The next major PITA is that there seems to be a problem with the rebuilt crankshaft which is going to mean stripping the engine again ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Mon Oct 09, 2017 6:57 am   Subject: Cold compression values, T20?
Thanks for the confirmation. Yes, I had picked up the bit about rotating rings and the ports from one of the tech manuals I have, hence my view of it needing a new piston. I did contemplate trying to ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Sun Oct 08, 2017 8:09 am   Subject: Cold compression values, T20?
I did one side OK but when I looked at the other side I found that the piston was missing the little pin that stops the rings rotating, in its top groove. So I need a new piston.

Oh well, getting ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Sun Oct 08, 2017 4:02 am   Subject: Cold compression values, T20?
Thanks for the encouragement, I hope this is the problem - it certianly wouldn't have helped!

I have just been over to the guy that helped with the rebuild and he confirmed that the rings are well ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Sat Oct 07, 2017 9:55 am   Subject: Cold compression values, T20?
I did a leak down test this afternoon and it passed with flying colours, holding pressure very well.

Then I took one of the cylinders off, removed a ring and did the end gap measurement. My feeler ...
  Topic: Cold compression values, T20?
fodder

Replies: 46
Views: 1082

PostForum: Suzuki   Posted: Fri Oct 06, 2017 2:00 pm   Subject: Cold compression values, T20?
Thanks, thats helpful advice. I'll certainly try that.
 
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