Kawi2strokes.com Forum

The 0.050" is misleading, but we get where you are going.

0.050. Is fifty thousandth of an inch.

.50 mm is virtually 0.020". Twenty thousands of an inch.

I am sure you wanted to say an .50 mm oversize, one half a millimeter, 1st bore oversize.

It can get confusing, millimeters to thousandth of an inch.

Its still all good, though.

Yes I mixed up mm and inches. Thanks for understanding my point.

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Bikes I drive/own

Kawasaki
1973 H1-D (New Project)
Suzuki
1974 GT250 (T350 upgrade)
1976 GT250 (T350 upgrade)
1971 T350
1970 T350 (New Project)
1974 GT380
1975 T500
1973 GT550
1975 GT750
Yamaha
1972 DS7 (R5 upgrade)
1977 RD400

I see you are located near where my family came from, Irasburg, Hinesburg. They got there in about 1628 or so. They founded Charlestown, now a suburb of Boston, and were on the 3rd ship from England/Ireland, The Lion's Whelp (Abigail). Hoyte, Ray, Spencer.

Live more south in New Hampshire along Connecticut river and my view is west into Vermont. Spend most of my
2 stroke riding in Vermont both motorcycles and snowmobiles. Lately ride my Trek road bicycle more than any of my motorcycles. Getting old and fat, trying to fix that somewhat... at least the fat part.

Ended up buying new left cyl as well for my 73 H1-D as mine for some reason was TP-4 not TP-3.... I suppose someone at one time swapped? Can't imagine Kawasaki mixing as they switched to the E model following year. Too bad that wasn't the one I cut up.

I have NOS STD piston no suffix came with NOS cyl and a 1A and 2A coming. I'll see if I can measure a difference in piston dia measure with Micrometer. Useless trivia now as not many around. If I don't like I'll sell for a loss.

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Bikes I drive/own

Kawasaki
1973 H1-D (New Project)
Suzuki
1974 GT250 (T350 upgrade)
1976 GT250 (T350 upgrade)
1971 T350
1970 T350 (New Project)
1974 GT380
1975 T500
1973 GT550
1975 GT750
Yamaha
1972 DS7 (R5 upgrade)
1977 RD400

The "TP" designation is ONLY the foundry designation, not the spec designation. There are variations, but they are not specified on the castings. The later castings can be identified by 8mm exhaust studs and the transfer cutout are lower.

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Twist the throttle, tilt the horizon, and have a great time. What triples are all about...........

My transfer cut out on that left cylinder, cast liner, is lower/less and the one marked "TP-4", which I thought started at 1974 and up , not at 1973 and under. Maybe, if my 73 vin part number is close to end of that year's production run (did not check yet) to when 74 starts, maybe Kawasaki mixed them up? That doesn't make sense... seams someone after did the swap. Not sure why? It did have the 8 mm studs.

If "TP" is the foundry, I am thinking -1, -2, -3 and -4 is the revision of that item? Also, I thought the 1969-1973 used same cyl (so says part manuals ... published date?). Other than the very first 69s, which had dual intake windows I read..

If dual intake is rev 1, what was rev 2?. if rev 3 is last replacement part for 1973 and under and rev 4 is for 74 and up. Well, if that is even the revision indicator as I am assuming.

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New cyls don't come with studs... the 8mm to 10mm step up studs are still available per Partzilla. I could not get the ones out of my old cylinder using the double nut trick. Other types of stud removers tool will bung up 8mm threads as nothing else to grap on to.

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Bikes I drive/own

Kawasaki
1973 H1-D (New Project)
Suzuki
1974 GT250 (T350 upgrade)
1976 GT250 (T350 upgrade)
1971 T350
1970 T350 (New Project)
1974 GT380
1975 T500
1973 GT550
1975 GT750
Yamaha
1972 DS7 (R5 upgrade)
1977 RD400

Regular cycling will make you younger, health-wise. I too put more miles on a bicycle than on my motor vehicles.

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If it surges, that's normal, upshift.

Be aware that the stud spacing is also different between the cylinders that came with 6mm and 8mm studs. I had an H1-E which I installed early cylinders on, replacing the 6mm studs with the "proper" 8mm caused the exhaust flange (stock pipes) not to fit anymore. I had to get busy with the Dremmel and slot the holes to make them fit. There must be some way to identify early/late on the replacement cylinders... I don't remember the difference in spacing, not much but enough to cause this issue, maybe a couple millimetres.

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We don't need no stinkin' Cams!

There are three H1 cylinder designs.
http://kawatriple.com/partid/cylinders/cyldif.htm
The stud spacing is different between early & late by about 2mm as well as stud diameter.
TP designation has nothing to do with cylinder design, rather, the mold that was used to cast the cylinder.

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Answers are here: http://kawatriple.com/