Boats For Sale:
'88 SN speed problem? |
Post Reply 
|
Page <12 |
| Author | ||
8122pbrainard 
Grand Poobah 
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
 Post Options
 Thanks(0)
 Quote Reply
 Posted: April-26-2010 at 8:40am |
|
|
Travis,
Did you ever find a timing light? Instead of wetting your finger, hook up the timing light to each plug lead. Brian, With all those boats you've had, no timing light? |
||
 |
||
|
travbo24
Newbie 
Joined: October-20-2009 Location: Fort Collins, C Status: Offline Points: 29 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 11:52am |
|
|
Hi guys,
I did borrow a timing light and tried to check it yesterday. There was still a mark at 10 degrees BTC and the timing seemed to be a bit behind (4 deg. BTC)...but it wasn't running well at all. I used the timing light to check all the cylinders and found that #4 had no spark. The plug wire was intermittent. I replaced it and then it seemed to run much smoother...but my higher rpm problem was still there. Thought I had it for a minute there. I'm going to put the timing light on it again today with all 8 cylinders..make any adjustments needed. I've almost burned through most of what was in the tank so I'll give it some fresh fuel. I did run it yesterday off a separate gas can...no difference so I don't think I have a tank problem. I'll try to get a fuel pressure gauge and check that today also...there is a pressure adjustment in the throttle body. If none of that works, I'm considering a return to the carb. Any thoughts on checking or rebuilding the carb before putting it back on? Is that a job for a pro? Thanks for everything...I'm amazed at how helpful you guys are. Much appreciated. Travis |
||
|
'88 Ski Nautique
‘02 Super Sport Nautique ‘93 Bass Tracker Pro17 ;) |
||
|
||
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 1:43pm |
|
|
Travis,
We've had a few here that never saw the inside of a carb and didn't have a problem. Considering what you've done so far, I don't feel you would have a issue with a carb rebuild. |
||
|
||
|
hotboat
Gold Member 
Joined: March-28-2009 Location: Conn Lake Pa Status: Offline Points: 814 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 7:12pm |
|
|
Yes Pete I have timing lights but I noticed he didnt in my reading and believe me that what finger does the trick if you have a dead one! lol
|
||
|
Brian
|
||
|
||
|
travbo24
Newbie
Joined: October-20-2009 Location: Fort Collins, C Status: Offline Points: 29 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 8:36pm |
|
|
UPDATE - I had a day to tinker, so I spent it. I replaced a bad spark plug wire, then adjusted the TPS on the throttle body. It was a bit off. After that I headed off to the lake...this time I took my handheld GPS just for curiosity sake. The boat ran much better (new plug wire). I was able to tune the ECM fairly well for idle, acceleration and got a pretty good take-off. It still feels like it's holding back at WOT...but the gps reads 39.5 mph at the top end. That's well above what my speedo's were reading. The tach still read just under 3400...could it be wrong? If the tach is accurate, maybe I am overpropped. Any thoughts on these new developments? I'm sure everyone is ready to see this thread come to an end just as much as I am. I feel more hopeful now than I did this morning.
Thanks!! Travis |
||
|
'88 Ski Nautique
‘02 Super Sport Nautique ‘93 Bass Tracker Pro17 ;) |
||
|
||
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 8:46pm |
|
Second post:
Get the dia. and pitch and post what you find. |
||
|
||
|
TRBenj
Grand Poobah
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21109 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 8:47pm |
|
|
Over 500 RPM of difference between RPM and speed certainly would indicate that youre overpropped. Too bad you dont have a carb- it would be easy to tell if your secondaries were opening.
I would suggest getting a shop tach to verify your RPM's. If what youre seeing is in fact accurate (confirming that youre overpropped), then if you give us some more info on how you use the boat, Im sure we could come up with a new prop recommendation. Knowing what you have for a prop right now would also be a good clue. That info will be stamped on the hub face (you would need to remove the nut to see it). |
||
|
||
|
travbo24
Newbie
Joined: October-20-2009 Location: Fort Collins, C Status: Offline Points: 29 |
Post Options
Thanks(0)
Quote Reply
Posted: April-26-2010 at 9:11pm |
|
|
I'll have to see if I can find a shop tach to borrow. The prop on the boat now I think is a 4-blade OJ 13x13 (stainless steel?). All it says on the hub is "OJ 13" and on the side is stamped "OJ102". The spare prop that came with the boat is an OJ 13x13 4-blade that is goldish in color.
|
||
|
'88 Ski Nautique
‘02 Super Sport Nautique ‘93 Bass Tracker Pro17 ;) |
||
|
||
|
79nautique
Grand Poobah
Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
Post Options
Thanks(0)
Quote Reply
Posted: April-27-2010 at 12:46pm |
|
|
We know your going to say 540 just like all the other times.
|
||
|
||
|
TRBenj
Grand Poobah
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21109 |
Post Options
Thanks(0)
Quote Reply
Posted: April-27-2010 at 12:57pm |
|
|
Ha, naturally.
 The 540 is a pretty sweet prop- but all the 2001's that Ive been in that have upgraded to that wheel are used to ski and barefoot and arent running loaded or at altitude. I have no idea how Travis uses his boat.
|
||
|
||
|
travbo24
Newbie
Joined: October-20-2009 Location: Fort Collins, C Status: Offline Points: 29 |
Post Options
Thanks(0)
Quote Reply
Posted: April-27-2010 at 1:15pm |
|
|
Morning guys, I've read enough of this site to know that you're big fans of this prop. I'm perfectly willing to throw down some cash on a good prop if it will help out the boat's performance. I want to try to make sure first that my current prop is indeed a problem. What do you think? Will a new prop make it perform the way it is supposed to? And what rpm/mph should I expect if the boat is propped right?
I will use the boat primarily to slalom ski and zip around the lake with my family. I will pull the occasional tube  (3 & 5 year old boys...go easy on me) and eventually teach my boys to ski. Most outings will be my family of four.
|
||
|
'88 Ski Nautique
‘02 Super Sport Nautique ‘93 Bass Tracker Pro17 ;) |
||
|
||
|
79nautique
Grand Poobah
Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
Post Options
Thanks(0)
Quote Reply
Posted: April-27-2010 at 1:22pm |
|
|
do a compression test this will indicate if you'll be able to get over 4k rpm wise, I would throw on the other prop and see if you get the same results rpm and mph with it compared to the one that is on it.
|
||
|
||
|
TRBenj
Grand Poobah
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21109 |
Post Options
Thanks(0)
Quote Reply
Posted: April-27-2010 at 1:22pm |
|
|
I think the 540 is the best all-around prop for that hull and powertrain. It will run pretty close to 1:1, just like the original 13x13 (the few Ive driven top out around 45-46mph @ 4400-4500rpm).
I think that prop will wake the boat up regardless of whether its the only problem you have or not... but do confirm your RPM's before you do anything. If you are in fact underturning by 500+ RPM (39mph @ 3400rpm) then a prop change is certainly in order. |
||
|
||
|
Luchog
Grand Poobah
Joined: April-17-2007 Location: Argentina Status: Offline Points: 2135 |
Post Options
Thanks(0)
Quote Reply
Posted: April-27-2010 at 9:53pm |
|
|
I think a compression/vacuum test would indicate what health this engine has left to play with, then he can start buying parts.
We need to know what propeller pitch is on the boat now. |
||
|
||
|
travbo24
Newbie
Joined: October-20-2009 Location: Fort Collins, C Status: Offline Points: 29 |
Post Options
Thanks(0)
Quote Reply
Posted: May-02-2010 at 11:42am |
|
|
Hi all...I finally got the boat running the way it should. I had no fire to the #4 cylinder. Had me puzzled for a while and finally figured out it was a backwards magnet in the magnet sleeve for the EI conversion. Got them all back in correctly and it runs like a top. I'm a little embarassed by how long it took to get here...but the upside is that I have really gotten acquainted with this "new to me" boat. Thanks again to everyone for the many responses...I'm sure I will have other questions sooner than later. Maybe I've even learned a thing or two I can offer to someone else in a pinch.
Take care!! Travis |
||
|
'88 Ski Nautique
‘02 Super Sport Nautique ‘93 Bass Tracker Pro17 ;) |
||
|
||
|
Post Reply
|
Page <12 |
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
travbo24 wrote: