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Raising engine height help
Whalin88	#1  Posted on 04/06/12 - 12:20 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	After asking around on this site about props someone suggested raising my 2003 90hp yamaha 2 stroke up on my 1988 Montauk to get better rpms and overall better performance. Im greatly considering raising the engine very soon, as in tomorrow soon. I just looked at the engine and it isn't All the way down on the transom. It's about an inch above it. The ventilation plate is pretty much in line with the bilge drain tube. I was wondering if this seems good as it is or should I go up one hole? As of now the engine is on the first hole (counting from the top down.) any help is greatly appreciated
Whalin88	#2  Posted on 04/06/12 - 12:24 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	**The ventilation plate is actually about an inch below the bulge drain tube
Joe Kriz	#3  Posted on 04/06/12 - 12:59 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	What holes are the bolts inserted in the engine bracket? http://www.whalercentral.com/articles...cle_id=106 Let us know.
Whalin88	#4  Posted on 04/06/12 - 2:07 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	It is bolted all the way down as represented in the diagram from the link you provided above.
Whalin88	#5  Posted on 04/06/12 - 2:08 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	The bolt is in the first hole
Joe Kriz	#6  Posted on 04/06/12 - 2:26 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	That is too low.... Some engines can be raised all the way up, however, I would start off by mounting it in the third hole which would be 2 holes up... If you have any problems with the lower holes, see this article. http://www.whalercentral.com/articles...icle_id=82 However, you shouldn't have any problems with your 1988 model....
Whalin88	#7  Posted on 04/06/12 - 3:20 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	Ok so you think moving the engine up two holes?
Joe Kriz	#8  Posted on 04/06/12 - 3:28 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	That is where I would start... 2 holes up, the bolts in the 3rd holes.. Also, see this post where he mounted his engine 2 holes up and his report.... http://www.whalercentral.com/forum/vi...rowstart=0
Whalin88	#9  Posted on 04/06/12 - 3:39 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	Thank you for the fast response Joe. It's greatly appreciated
Tom W Clark	#10  Posted on 04/06/12 - 5:45 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	How high you mount the motor depends, to some extent, on what propeller you are using. Can you tell us what propeller you are using now? Brand, model and size? If you're not sure what brand and model it is, look for a part number on it and I can decipher that for you.
Whalin88	#11  Posted on 04/07/12 - 4:55 AM
Member Posts: 71 Comments: 0 Joined: 04/18/10	Tom, The prop I was previously Using was a Yamaha 13 1/4x17. The prop I will be putting on and using is Solas 13.5x15. Th reason for change is the old prop is in rough shape and needs reconditioning. The prop I'm putting on is a spare I hot with the boat
Whalin88	#12  Posted on 04/07/12 - 5:36 AM
Member Posts: 71 Comments: 0 Joined: 04/18/10	By the way, I may put the original prop on during the season. A friend can get me a good deal during the summer to recondition the prop.
Tom W Clark	#13  Posted on 04/07/12 - 8:33 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	But which Yamaha 13-1/4x17? Aluminum? Painted Stainless Steel? Performance Series? Which? Don't bother with your spare Solas. It doesn't even matter which model of 13-1/2x15 it is, it is too little pitch for that motor. NEVER run a damaged prop on an outboard motor. Replace it, or get it fixed first.
Tom W Clark	#14  Posted on 04/07/12 - 9:14 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	In terms of how high to raise the motor, it will be more efficient to raise it three sets of bolts holes first, not just two. If you raise it three sets of bolts holes (all the way up) and the boat performs fine, you are done. If you are not happy and lower it one set of bolt holes, you've moved the motor twice. If, on the other hand, you move the motor up two sets of bolts holes and it performs fine, you still do not know if three holes up will be better, so you have to move it to the highest position to find out. Now you've moved the motor twice. If you then find out the motor is too high you have to move it back down a set of bolt holes, at which point you will have moved the motor three times, not just one or two. Based on my experience and the experience of many others, I think you will find your Yamaha 90 will do just fine mounted as high as it can go on the transom of your Montauk. I have yet to hear of one single person who mounted their Yamaha 90 all the way up on the transom of a Montauk and found they had to lower it back down a set of holes.
Whalin88	#15  Posted on 04/07/12 - 10:34 AM
Member Posts: 71 Comments: 0 Joined: 04/18/10	It's a k series aluminum prop made by Yamaha.
Tom W Clark	#16  Posted on 04/07/12 - 10:43 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	OK. I don't think you should spend money trying to repiar it. Just buy a new one or better yet, get a good stainless steel prop. It will be, by far, the best $250 you ever spend on your boat's performance.
Joe Kriz	#17  Posted on 04/07/12 - 12:45 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	I have yet to hear of one single person who mounted their Yamaha 90 all the way up on the transom of a Montauk and found they had to lower it back down a set of holes. Tom, Is there any brand of motor on a 16'7" Classic Whaler that you do not recommend raising all the way up? I see you mention E-Tec and Yamaha raising them all the way but what about the other brands? Maybe we should start an article?
Whalin88	#18  Posted on 04/07/12 - 12:56 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	Tom, I just called a local Yamaha dealer, they'd have to order the prop for me and it would be $150. I looked online and found them for $125 on a site, then found a couple on eBay for $100. I think I will just get the same prop as I have now and wait till I get some money to purchase a stainless steel one. I did however raise the motor two holes up.(I didn't see your post in time). It was fairly easy, only took about an hour. Thank you for all the help guys. I really appreciate it.
Whalin88	#19  Posted on 04/07/12 - 12:57 PM
Member Posts: 71 Comments: 0 Joined: 04/18/10	**The prop mentioned above is the same type as the one I have now.
Joe Kriz	#20  Posted on 04/07/12 - 1:03 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	Did you have a chance to try it out yet? I don't mind moving the engine up or down as it is fairly simple as you found out. So the prop you are using and now buying a new one, is a Yamaha 13 1/4x17 K Series.....?