Repowering 1801 with Yamaha 115 4 Stroke

stix217 · Apr 12, 2011

So I have the opportunity to repower my 2000 1801 with a 4 stroke yamaha 115. (the current 115 2 stroke has a blown power head and would need to be rebuilt) I'm concerned that the 4 stroke weighs more than the 2-stroke that's on there now, and that my bow will be up out of the water too much. Do you guys have any experience with this? Repowering with the used 4 stroke would end up being about the same price as having the 2 stroke rebuilt (but then I'd have the 1 year warranty).

Anyway...any help/insight you can provide is appreciated.

-Chris

windknotnc · Apr 12, 2011

You didn't give us the specs on the 4 stroke. What yr, # hrs, condition? Obviously you will notice a difference in the 2 engines in torque and power curve. I think the weight is fine as many 18' are powered with a 150. You didn't mention the cost to rebuild and the outlay for the 4 stroke. You may find a 150 if you shop around.

DBthal · Apr 12, 2011

Chris -

My Parker 1801 has a factory installed Yamaha F115TXR (four stroke) which weighs 412lbs. The boat is fine with that motor and the scuppers stay clear of the waterline. The 1801 is not a speed demon with a F115.

A Yamaha F150TXR weighs 475 lbs. I wouldn't want much more weight on the transom than the F115 I have now.

From this chart http://www.yamaha-motor.com/outboard/07 ... ls_web.pdf it appears the two stroke 115TLR weighed 358lbs.

Hope that helps.

Dan

stix217 · Apr 12, 2011

Thanks for the info guys...
I'm not too worried about the torque or power curve as much as I'm worried baout the additional weight. I feel like my bow sits high as-is with the 2 stroke and 2 batteries back there. I realize I'll notice a difference in how quickly the boat gets on plane, but I'm not racing anyone, and I don't really use the boat for skiing or towables, so I don't think it will be a problem...

The current 2 stroke is a 1999 and the potential repower 4 stroke is a 2004. I don't know the hours on it, but I hope to find that out soon. The cost of rebuilding the 2 strk and repowering with the used 4 strk are just about the same, so that's not an issue for me.

Do you know of any issues with the mounting holes, or controls (i.e. can the 2 stoke mounting holes and controls be used for the 4?)

Thanks again guys!

jonas grumby · May 2, 2011

My '06 1801 has the 115 Yamaha 4-stroke. You'll be hard-pressed to find a better matched motor for that platform. My family uses the boat for fishing as well as tubing and I have yet to have any issues regarding performance. At 29 mph I am getting 6.2 mpg, that's hard to beat!