At-1 Ct-1

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kram350kram
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At-1 Ct-1

Post by kram350kram » Thu May 25, 2017 10:06 pm

From what I understand now, an AT-1 head will not work on a CT-175 ? Is that due to compression issues, head sealing/gasket issues or bolt pattern? Thanks in advance
jim663
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bore

Post by jim663 » Fri May 26, 2017 12:08 am

The main reason is that the bore size is different: 56 vs 66, according to Wikipedia...
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but that said,...

Post by jim663 » Fri May 26, 2017 12:10 am

You will find a lot of sellers in ebay advertising pistons, rings, cylinders, and heads as "fits AT, CT, DT," etc. Must beware!
kram350kram
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Post by kram350kram » Fri May 26, 2017 11:00 am

Thanks for the input. So it will bolt on, but machining of the combustion chamber would be necessary for gasket seal and compression?
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ASCOT TT
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Post by ASCOT TT » Fri May 26, 2017 5:23 pm

kram350kram wrote:Thanks for the input. So it will bolt on, but machining of the combustion chamber would be necessary for gasket seal and compression?

You need to do a complete 175 conversion. You need a jug - you need the head - you need the 175 head gasket and base gasket. You should get a new needle bearing and perhaps additional exhaust components. I have an extra one that is ported .. The complete set bead blasted cost me $200 in labor $100 in parts and I already had the jug and head. I'm selling the entire unit for 500 bucks ready to bolt on. Everything that was mentioned. I'll even cover the shipping.
There's nothing like a little misunderstanding to add more whoop-tee-doo's to the mx course you've already mastered ... Just a slower lap time & warmer shocks..
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fine69
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Post by fine69 » Fri May 26, 2017 5:31 pm

Here is what you need bidding if yours is a reed valve. I believe lha can verify that the 74 will fit the reed at/ct 2. You can watch it and see where it goes.

http://www.ebay.com/itm/DT175-TOP-END-J ... hu&vxp=mtr
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Post by Dave Rymal » Fri May 26, 2017 6:06 pm

jim663 wrote:You will find a lot of sellers in ebay advertising pistons, rings, cylinders, and heads as "fits AT, CT, DT," etc. Must beware!
Buy a CT1 head, I have plenty.
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ol brown shoe
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Post by ol brown shoe » Fri May 26, 2017 9:27 pm

Dave Rymal wrote:Buy a CT1 head, I have plenty.
Dave
I agree. Capt. Dave knows.
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ianjorgensen
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Post by ianjorgensen » Fri May 26, 2017 9:35 pm

Be forewarned that if doing a CT1 conversion you will need to the correct piston pin/needle bearing to match the CT piston, even though the con. rod small end inside bore is the same for ATs and CTs.
- 1970 AT1, 1974 DT 175, 1975 TY 175, 1977 YZ400, 2011 Husaberg FE390 -
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Post by baldboy17 » Sat May 27, 2017 9:49 am

who's ol brown shoe????dance
REMEMBER.... THE GAS IS YOUR FRIEND, THE BRAKE IS YOUR ENEMY! http://WWW.KDIREPROS.COM
:D
IF YOU WANT MY 2 STROKE YOU'LL HAVE TO PRY IT OUT OF MY COLD DEAD HANDS[o-o]
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