tell me what you think

[rprinzo]

2-4-61-3-5

0ne hr run time on new plugs with chop at the trailor,

at 22deg wouldnt go past 6000rpm and 60mph, gave it a little more timing on top and got 6200 and 67mph,then it did what it does and best description is its like hitting a piece of wood with the lower unit and a 300 rpm lose, should it add some fuel with the brocato?

[Stoker boy]

To me they look pretty dry. I’m guessing you’re not running pyrometers? Stay on the safe side I would try to run a little bit rich. You have a better chance of not damaging the motor if you’re a little bit on the rich side. Fuel pressure gauge is not a bad idea either. There are many variables it’s just a process of elimination.

[LakeFever]

When tuning sleds we always looked out for that white ring around the electrode which you can see on the top plugs in both pics. Thats as lean as you want to go id go with above advice and enrich the fuel a bit more as well. Maybe these Mercs are different, not sure Im hoping to learn something here but wanted to share my experience as well maybe it helps

[rprinzo]

What do you have?

94 200xri.FF,complete rebuild,all new electronics and harnesses(cdi hp stator,trigger,blue swboxes,v regs,brocato,plug wires) removed black boxes and jumped bias.new fuel pump,ccm reeds/lapped cages,flowed injectors, opened exhast to match bobs tuner,removed liner,stock heads cause california gas. aint ran right yet

[Stoker boy]

I run California gas no problem. I run 91 pump gas and 110 race fuel. Different ratios for different compression. What type hull, what type of RPM are you expecting to run?

[Chaz]

Show off ....

Cinnamon nose , slight hydrocarbon ring at the base of the porcelain , fuel stain up the the center electrode .. to within .020 or so from the tip is your timing mark .. .040 is about max . Ground strap is overall heat .. middle of the bend is as far as you want to burn the cad off ... No heat in the body or threads .. looks plenty safe .. good job

An oldie , but goodie ...

https://www.strappe.com/plugs.html

[rprinzo]

I run California gas no problem. I run 91 pump gas and 110 race fuel. Different ratios for different compression. What type hull, what type of RPM are you expecting to run?

its on a 94 skeeter 200zx, two years ago i was gettin 74mph gps at 6400rpms with a 25p temp plus, 12" jp. last year it started slowing down and i only saw 70 once goin downstream. loosing rpms to 6000. this year i havnt gone above 67,so after stripping a sparkplug, i figured at 35yrs old and never opened up,it was due for rebuild. was looking forward to getting my speed back and was hoping to get a little more out of it. its been dissappointing to say the least

[LakeFever]

You sure the prop isn’t tweaked? Hull soakin up water somewhere?

[Stoker boy]

6400 RPM at 74 miles an hour was your previous best? With 8% slip 74 miles an hour with 187 gears 25 pitch seems to be accurate. With everything the same at your current best of 6200 RPM should be around 72 miles an hour. Definitely something funny going on.

[Stoker boy]

You sure the prop isn’t tweaked? Hull soakin up water somewhere?

I’ve seen that before.

[PanRonnie]

i guess your skeeter can soak up water!?
https://forums.iboats.com/threads/19....552859/page-2

[rprinzo]

You sure the prop isn’t tweaked? Hull soakin up water somewhere?

Hmmm, i do have a 25 p lazor i could thro on and see what it does,it doesnt have the lift like the temp but actually the temp doesnt seem to lift like it used to now that i think about it. Hull is dry.
but it still wants to buck/surge at 6200, which is why i wanted to add some fuel,think ill thro 1% on it and see what happens. Couldnt hurt anyway. Ill be back

[rprinzo]

i guess your skeeter can soak up water!?
https://forums.iboats.com/threads/19....552859/page-2

Interesting thread,had a repair done on the outermost chine a year ago and the transom and side were checked and were good. If it were wet id think it would be easier to get lift up front,i did add another battery back there for a 36v trolling motor.

[rprinzo]

so i gave it 1% more fuel on the brocato and changed prop to see if the temp was wacked. fired up right on the hit and idled better than ever. took it to the river and again it fired and idled perfect. warmed it up and idled out of marina and hit it and it jumped up on plane the best yet. figured i finally got it right. then it hit 6k rpms and went to its old ways, dropping 2-300rpms and surging. but this time i backed off the throttle just a hair and it quit surging and ran smooth at 6k rpms. put it to the floor and surges,back off and it doesnt. could press regulator be doing this? its the only thing left untouched.took it apart looking for a filter i keep reading about but no filter in this one.ive lost 12mph from before rebuild.but this problem was also happening before rebuild but not this bad, anybody?

[LakeFever]

You sure the ign system isnt breaking down? Stator and spark boxes maybe? On my old crossflow when the powerpacks failed they just slowed the boat down about a thousand RPM I thought the motor was tired because it started fine and idled well. I swapped out the new Sierra and BOOM immediately spinning past 6K again. Just a thought