[cdwebbtech]

I sold this 9.9 10R74S to a fellow a couple months ago. He used it a few times frog hunting and said it did fine then he thinks it stopped pumping water. But, he kept using it until it quit running. The head gasket is definitely blown. But, I don't know how to determine if it will need more than just the gasket replaced. I have taken some pics of the cylinders.
#2

#2

#1

#1

[marcpage]

The water pump was new and I tested the thermostat on the stove. It opened at 155 F.

[reverselockup23]

#1 tested to 91 PSI. #2 tested to 68 PSI.

[BlackEye]

You will need a spark plug wrench or a socket wrench to replace this part. more

[stevendowning]

This is a genuine OEM sourced replacement spark plug. It is a high quality item used with Honda small engines. A spark plug is used to deliver electric current from an ignition system to an internal combustion engine. You should gap your spark plug according to the owners manual of the outdoor product you have. Please note, (1) item is sold individually.

[destinbrides]

It is a genuine item that is supplied by the original manufacturer for use with Honda engines commonly installed on a variety of lawn and garden equipment. This is one of the flange nuts that are utilized to secure the exhaust manifold. A flange nut is designed to provide a tight fit and resist loosening. Replacing it is a simple task that should only require a wrench to remove and secure it. To ensure the correct location, please refer to the diagrams of your model. One durable metal nut-flange is included.

[Lexington]

This is an authentic manufacturer sourced replacement part designed for use with Honda engines. This carburetor gasket provides an air tight seal between the carburetor and the insulator. Over time gaskets tend to deteriorate and would need to be replaced. It is made out of compound material and it is sold individually. more

[BitcoinCyberStore.com]

Re: Necessary to remove powerhead to replace head gasket on Nissan 30 2 stroke?

[AgoraMutual]

Re: Necessary to remove powerhead to replace head gasket on Nissan 30 2 stroke?

[eresearh]

Thanks for the replies. I went ahead and removed the powerhead, even though that meant having to eat the cost of a new base gasket. I like having more room to work. It will also allow me to clean the powerhead and base, and do some wiring with greater ease, and let me get my torque wrench to the bolts easier. I'm not new to outboard repair, but I don't have all of the very best tools for the job, i'm sure. I've swapped powerheads, parted out, and built some 9.9, 15, 18 nissan/tohatsus before, but never tried to replace a cyl head gasket w/ the powerhead installed. Was hoping it was easy to access. I have the old gasket material cleaned up, and am waiting on the base gasket. Thanks again for the advice. [links]

[Bitcoiner]

Every crankshaft is disassembled, fully polished, and checked with a micrometer to be within specs. With a growing inventory of crankshafts, we produce some of the finest replacement crankshafts available today.

[noles]

Each connecting rod is soda blasted and polished in a centrifugal polisher. The bearing surfaces are polished out so you receive a fully inspected part with flawless bearing surfaces that will look and work like new.

[lowifi]

Bearings are centrifugally polished to ensure that they are sold and received in absolutely flawless working condition. [links]