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I tried:oops:. I didn't know the that the cylinder holes were different. 2 and 4 bolt are standard now so it would have worked. The cy Dynamite you have wasn't and is discontinued unless you buy a new motor. I wouldn't buy a new dynamite cy motor. Go standard. I like my Rovan 30.5 cc.

That's why I never bought the losi with the dynanite cy engine. It was junk from the start and more expensive as a upgrade and parts were hard to get. I waited until standard parts were available. Best of luck Either get a zenoah or a Rovan motor. Stay away fron CY.

Then send it back to the seller. CY did something different with the F29 engine I guess? (why discontinued?) \Dynamite F29 Top End Rebuild Kit (4 bolt): DYNE1075 Product Reviews (rcslot.com) This should be it but out of stock or discontinued. You could just get a new motor? Rovan 29cc 4-Bolt...

DDM has the best price when on sale $250

1/5 SCALE RTR CARS | RCMAX - THE PREMIUM 1/5 SCALE SPECIALIST

I have a Zenoah G320 just sitting in the box for a spare.

I think that G620PU was nothing but problems for you. it needed a lot of work to put in. Better of sticking with CY or Zenoah. I have a Rovan 30.5 cc and never had problems. If in the future you do go Zenoah make sure to get a new half clutch housing. The Cy half clutch housing is different from...

King Motor 2 Stroke Gas Engine 29cc 4 BOLT Rebuild Kit Fits HPI Baja, CY, Rovan 782301157255 | eBay Us Rovan 29cc 4 Bolt Top End Engine Rebuild Cylinder Head, Piston, Spark Plug Kit 736846119353 | eBay

Exactly what I said! I linked what you needed. Engines came in 2 bolt and 4 bolt heads. I would do a top end kit. They are cheaper than trying to put that g620 in. The clutch kit alone is more than a top kit. I will never put anything bigger than a 45cc motor in with a 54 mm clutch cars. Zenoah...

You can put any 4 bolt top end head on. ObR only specializes in Zenoah. Ebay. 4 Bolt 32Cc Engine Cylinder Kit for Rovan Cy Zenoah Engine for 1/5 Hpi Km R R4H9 4894822307555 | eBay29CC 4 Hole Cylinder Set Fit for Zenoah CY Rovan TSRC XJM Engine for 1/5 HP C2D0 4894817792489 | eBay

Yes there is. Chung Yang 235-214029 CY 35mm Big Bore Kit for 2mm Stroker Engines (davesmotors.com)

O'neill Brothers Racing – O'Neill Brothers Racing. Top end kits are cheap. I just like drop in motors.

Big bucks and a lot of work. Rovan rc has a 45 cc drop in motor or OBR has motors The only was to seize the motor was to use straight gas. I have run up to 50:1 no problems.