Click to enlarge

4MM OVER STANDARD 50MM Piston, 9:1 Compression

I HAVE PUT ONE OF THESE ON MY K1 AND I AM TICKLED BEYOND WORDS!!!!!

SHE PULLS MY LARGE A _ _ UP THE HILLS GREAT!

I HAVE NOT EVER RODE A 90 THAT STILL PULLED IN 4TH GEAR (:

DID I SAY HOW HAPPY I WAS YET ?? (:

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here is what one of our great customers had to say:

Jack and crew.

Just finished installing the CT90 big bore kit and had to write before I wiped the big smile off of my face. Works great. In your posts on the product page your other customers talk about having it on with a sport cam and/or a bigger carb but anyone looking at whether or not to go for it should know that it works just fine with a stock carb and your inexpensive (ie cheap) after market stock 19mm carb, and still gives that extra pull the 90c.c. was simply missing. If you are going to keep it on sale for that price I would highly recommend it over even a simple replacement piston or a .25 or .50 replacement . Also, I had to go to 4 different shops before I could find someone who was willing to bore the cylinder to this size, everyone thought I was crazy. But after the 4th guy actually went and did it he couldn't figure what the hell the fuss was about. Plenty of room there. If anyone in the Saskatoon/ Regina, Saskatchewan, Canada region is having problems finding someone who will do the bore out let me know I'd be more than happy to pass this shops name along great guy, great work at a reasonable price. If anyone finds a shop that is hesitant, just tell them to go ahead and get it done.

Thanks again for the site, your fast friendly service and solid product make this hobby fun not a pain in the ass.

Keep the rubber side down and the pleather side up. -- Gavin D.

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and another

Doc; I got my CT90 back togather with the 104 piston and the 22MM 110 carb. and I ported the head+ I put a 110 ATC cam in it!!!! It hauls butt Holy Cow!!!!!!! That old KO90 1966 never ran like it does now!!! Just wanted to say THANKS 4 all your help!!! Latter.

Subject: 22MM 110 Carb To: dratv@yahoo.com This is the Carb I put on my big bore 104CC CT90!! I run the Idle jet # 38 that came with it and went to a 88 main jet.For $39.95 you cant go wrong!! Works PERFECT!!! Thanks for all the Good Stuff+Great Prices+Your Help!!

Eddie O.Porterville California.

OUR 95W WORK FOR REPLACEMENT RING SETS

BIG_BORE_KIT 54MM_BORE_KIT CT90_ATC90_ST90 CL/SL/S90_CM91 (90+4MM) TEMP OUT OF STOCK (ETA_9_15_10) 90+4MMRegular price: $99.99Sale price: $59.99

RING SET ONLY  51MM  52MM  54MM / 85CC 88CC 95CC  RING SET ONLY 51MM 52MM 54MM / 85CC 88CC 95CC THESE ARE REPLACEMENT RINGS SETS ONLY FOR OUR BIG BORE KITS.

IF YOU HAVE A 85CC KIT FOR USE WITH THE 81 AND OLDER 50 OR 70 ENGINES, (it may have) THE THICK RING SET,(mostly sold in 2005)

PICK_THE_SIZE 51MM/85CC_(95S) 51MM/85CC_THICK_(95R) 52MM/88CC_(95T) 54MM/95CC/104CC/114CC_(95W)

RINGSONLY$23.95PICK_THE_SIZE: 
TOP END GASKET SET 90CC ALL BUT SEE DISC. ATC110_79&80 (GTE522)TOP END GASKET SET 90CC ALL BUT SEE DISC. ATC110_79&80 (GTE522)THIS IS A TOP END GASKET SET FOR ALL CT90'S ATC90'S,AND(ATC110'S 79 AND 80) BUT!!!!!!IF YOU HAVE A (CT90K0 THRU K4) OR A ATC90 WITH A ENGINE SERIAL NUMBER LESS THAN 1113934 THE HEAD GASKET IN THIS KIT WON'T WORK,IF YOU WANT A NEW HEAD GASKET, YOU WILL HAVE TO BUY THE ONE NEXT TO THIS ITEM. OUR NUMBER HDGAS90,,SORRY AND THANKS

TOP END GASKET SET 90CC ALL BUT SEE DISC. ATC110_79&80 (GTE522) GTE522$11.99
*HEAD GASKET CT90 K0toK4 ATC90 EARLY   7/10M  (77R) *HEAD GASKET CT90 K0toK4 ATC90 EARLY 7/10M (77R) THIS IS THE ALL ROUND HEAD GASKET THAT THE CT90K0 THRU K4 TOOK AND THE EARLY ATC90'S THE NEWER CT'S AND ATC'S HAVE THREE NOTCHES IN THE HEAD GASKETS.

THE ALL ROUND HEAD GASKET WORKS FOR (CT90K0 THRU K4) OR AN ATC90 WITH A ENGINE SERIAL NUMBER SMALLER THAN 1113934

77R$4.95
*CT90 ATC90 ATC110 ST90 NEWER STYLE HEAD GASKET 6/10M (83w)*CT90 ATC90 ATC110 ST90 NEWER STYLE HEAD GASKET 6/10M (83w)THIS HEAD GASKET WORKS FOR (CT90K5 THRU 1979) OR AN ATC90 WITH A ENGINE SERIAL NUMBER LARGER THAN 1113934

*CT90 ATC90 ATC110 ST90 NEWER STYLE HEAD GASKET 6/10M (83w) 83W$3.45