• Welcome to Jetboaters.net!

    We are delighted you have found your way to the best Jet Boaters Forum on the internet! Please consider Signing Up so that you can enjoy all the features and offers on the forum. We have members with boats from all the major manufacturers including Yamaha, Seadoo, Scarab and Chaparral. We don't email you SPAM, and the site is totally non-commercial. So what's to lose? IT IS FREE!

    Membership allows you to ask questions (no matter how mundane), meet up with other jet boaters, see full images (not just thumbnails), browse the member map and qualifies you for members only discounts offered by vendors who run specials for our members only! (It also gets rid of this banner!)

    free hit counter
  • Reminder of the Thrust Vector and Lateral Thruster group buy through JetBoatPilot.....you only have Until AUGUST 31st. to get in on this group buy

    So if you are looking to improve your steering-either forwards or in reverse.....this sale may be for you!  

    Thank you Will @jetboatpilot for offering this exclusively to JETBOATERS.net members!

    (You can click the X to the right to dismiss this notice)

Motor issue mercury 175 hp sportjet on Sugar Sand Mirage

schnur07

Member
Messages
4
Reaction score
0
Points
10
Boat Make
Sugar Sand
Year
1996
Boat Model
Mirage
Boat Length
16
I have a Sugar Sand Mirage with the 175hp sportjet. When cold it would run ok for 5-10 minutes then suddenly it felt like it lost about half its power still ran smooth but sluggish. I took it to a mercury mechanic and he replaced the stator. I put it in the water and it ran at about half power still. I took it back to him and he replaced one of the CDI units - he showed me the old one and it was cracked. He said he tested it in the shop and all six cylinders were firing. I launched it today and seemed to be idling well and then a sudden change in idle. I went to take off and same issue - very sluggish taking off with top speed at 30 mph instead of 50mph. Could it just be the other CDI went bad or is there something else the mechanic could be overlooking? I'm already into this about $900 on a boat that's barely worth that much.
 

Chuck Buck

Well-Known Member
Messages
40
Reaction score
45
Points
47
Location
Lake St Clair
Boat Make
Sugar Sand
Year
2004
Boat Model
Mirage
Boat Length
18
The clue provided about running OK cold makes me think an electrical component is heating up and failing. Mercury says the switchboxes (CDI unit?) should be replaced in pairs. Since one was “cracked” I have to think the other is toast unless recently replaced. Is there a date code on it?
 

schnur07

Member
Messages
4
Reaction score
0
Points
10
Boat Make
Sugar Sand
Year
1996
Boat Model
Mirage
Boat Length
16
Thanks for the reply Chuck. Not sure how to find a date code, but the boat mechanic said the stator he replaced was the original so wouldn't be surprised if the switch box was original. He's thinking he needs to replace the other switch box (he referred to them as a CDI) but I just wanted to make sure it couldn't be something simple he's overlooking. Another switch box is going to be another $450!
 

Chuck Buck

Well-Known Member
Messages
40
Reaction score
45
Points
47
Location
Lake St Clair
Boat Make
Sugar Sand
Year
2004
Boat Model
Mirage
Boat Length
18
I’m confused. According to NADA, in 1996 Sugar Sand exclusively used 120 HP SportJets (see screenshot below).

102769

This would mean it’s a 4 cylinder and requires only one switchbox (CDI # 114-6866). Yet you say it’s a 175 HP, which implies six cylinders. What gives?
 

schnur07

Member
Messages
4
Reaction score
0
Points
10
Boat Make
Sugar Sand
Year
1996
Boat Model
Mirage
Boat Length
16
I might not have the date correct but it is definitely a 175. I would have to look at the title for the date.
 

Chuck Buck

Well-Known Member
Messages
40
Reaction score
45
Points
47
Location
Lake St Clair
Boat Make
Sugar Sand
Year
2004
Boat Model
Mirage
Boat Length
18
Exact year isn’t important so long as it’s a 175 (97-05). Fleabay has new CDI Switchboxes for around 250 clams (114-4953-32). Personally, I’d replace it myself rather than pay that person YET ANOTHER $200 labor. For someone with even basic mechanical skills, it ain’t that hard.
 
Top