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  1. snowbrd84

    Thunderbolt V vs Delco EST Ignition

    I bought a Delco EST ignition conversion kit (Sierra) thinking my TB V module was bad. Then found out it was mechanical issue and TB V seems to be working. Question I have now is, is the Delco EST an upgrade? Or just keep the TB V installed? I can still return the one I bought. Or I could...
  2. snowbrd84

    No compression with rocker arms torqued

    Recently replaced camshaft and had 135-145 psi in cylinders 1-7, 180 in number 8 before. Boat still seriously lacks power. New compression test today. 1 145 2 145 3 90 4 0 5 150 6 140 7 0 8 145 If I loosen the rocker arm bolts on a bad cylinder all the way, it goes to 145 ish psi. Tried...
  3. snowbrd84

    7.4 carb with Thunderbolt V - Cant get into base timing

    I had wondered why it seemed my timing was bouncy when setting base timing. I have been.grounding the purple/white lead. Was reading merc manual and saw the adaptive advance feature which I now understand why it moves around. Problem is that is supposed to disable with the purple white grounded...
  4. snowbrd84

    7.4 Bravo water pump driven fuel pump

    On to the next issue in this 2 months new to me boat. Bought it knowing it had a power loss issue, but it was still usable and a good deal. First thing was compression test which lead me to a wiped cam lobe. Replaced camshaft with help from folks here. Water test yesterday still had issue. Still...
  5. snowbrd84

    In-boat camshaft replacement - 7.4 Mercruiser

    Couldn't get above 3,800 RPM and had tapping from starboard valve cover and high compression in number 8 cylinder. Ended up being a wiped intake cam lobe - thanks to everyone's help getting that figured out in this thread -...
  6. snowbrd84

    High compression in 1 cylinder - 7.4 carb

    1997 Sea Ray 270 with a single 7.4L carbed engine and Bravo 2 sterndrive Boat runs great at low speed but will not accelerate past 3800ish rpms. Gets up on a plane and will cruise at 27-29 mph with no bogging. Just won't go any faster. Bottom is clean, new wires, cap and plugs this year. Motor...
  7. snowbrd84

    Partial deck replacement

    Got a good deal on a '96 Bayliner 1950 that I knew had 2 soft spots on the floor but runs great. Pulled the carpet and the spots didn't look too bad. I was able to cut out the bad spots and get to dry strong plywood around both. Foam is dry and stringers look good and rest of the deck is dry...
  8. snowbrd84

    '96 Mercruiser 3.0 LX Compression Numbers

    Bought a new boat and decided to check the compression today. My compression numbers on a cold engine were 125 160 150 150. Carb needs to be rebuilt before I can run it to bring it up to operating temp to test again, but is that 125 likely to be an issue?
  9. snowbrd84

    Upgrade from Old "Figure 8" Fuel Pump to Newer "Square" Style?? Bolt on??

    Upgrade from Old "Figure 8" Fuel Pump to Newer "Square" Style?? Bolt on?? Cant find this covered anywhere, will the "newer" square style fuel pump bolt on to replace the older "Figure 8" style on the old 2 strokes? The square ones are supposed to be improved and are cheaper than the older style...
  10. snowbrd84

    86 Blackmax 150 Bogg on Acceleration, Out of Money/Time/Patience/things to replace

    Long post here, but I have read at least 500 pages of posts and troubleshooting guides over the last 3 months, so here it goes. I have a 1986 Mercury Blackmax 150 XR2 on my 18' bowrider with neverending issues. I have put so much money into this motor that I am sunk at this point, unless I can...
  11. snowbrd84

    1990 Force 90 Powerhead

    Am I completely blind or is there no classified/used parts section on iboats? I have a 1990 Force 90 powerhead, minus the electronics, that is in perfect condition and collecting dust in my garage. Too specific to find anyone through CL, and eBay is a joke when it comes to stuff like this...
  12. snowbrd84

    Prop size and fuel economy

    I have an 18' bowrider with a Mercury 150 XR2 and a 20p aluminum 4-blade prop. I can't even get to WOT because at about 48mph if feels like the boat is gonna fly out of the water... I don't really need to be able to go 50mph, but it is nice to have that power and get going real fast...
  13. snowbrd84

    1990 Force 90 Lower Unit Question

    Just sold my 1990 Force 90 lower unit that worked absolutely perfectly last year when I removed the 90 and upgraded to a 150 merc. The guy who bought it is not claiming that he installed it and adjusted the shifter because he said it wasnt adjusted right, then took it out on the water and it...
  14. snowbrd84

    Part ID Questions for a tiny little valve? on the crankshaft cover on Mercury 150 v6

    I looked at all the diagrams and searched far and wide on the web. I am rebuilding my 86' Mercury 150 v6 that blew the #6 piston. On the crankshaft cover, there is what appears to be a very small gray metal ball sitting in a brass valve/fitting that is pressed into the crankshaft cover. It is...
  15. snowbrd84

    Different Types of Piston Rings on Same Model Year Motor?

    I am replacing the #6 piston on my '86 Mercury 150 XR2 motor and I conveniently found someone parting out the exact same motor and bought the #6 piston from them which was in absolute immaculate condition. The piston rings on that piston are different than the rings on my motor. All the rings...
  16. snowbrd84

    Mercury Oil Injection Complete Removal during Rebuild

    I have my '86 Mercury Blackmax 150 completely apart to replace a piston. I would like to completely remove the oil injection and move to pre-mix as I absolutely do not trust the oil injection and would rather have the piece of mind that I know its getting oil with pre-mix. So can I just...
  17. snowbrd84

    Piston Replacement on a Mercury 150 V6, Some Advice Needed

    Took the boat out this weekend for the first time with the new to me '86 Mercury 150 XR2. It seemed to be running great although there was some hesitation and every once in a while i would hear a strange clanking/knocking sound that I though was a misfire. The 150 on my 18' bowrider absolutely...
  18. snowbrd84

    Mercury 150 started misfiring after runnning perfect for about an hour.

    Took out the boat for the first time yesterday with the new to me '86 Mercury 150 XR2. I was leary about the oil injection, not knowing if it was working. So just in case, I mixed the gas in the tank at 75:1. Boat fired right up and ran great. Took it out on the water, it was scary how fast...
  19. snowbrd84

    I Need to Test the High Temp/Low Oil Alarm, Where is the Alarm Siren Located???

    I just put an 86 Merc 150 XR2 in my boat along with the controls it came with, the side commander or something, it has the big square button for neutral throttling and it has kill switch, trim control, and key switch as well. Previously, the force motor i had triggered an alarm siren under the...
  20. snowbrd84

    Need Help Getting a Smooth Finish After Fiberglassing

    I recently installed a new deck in a 1990 Bayliner I bought along with some custom seating I made. Long story short, I am an idiot and did not pull the gas tank out (it looks brand new from above), and upon finishing the project, I poured 3 gallons in to test the motor, 3 minutes later, motor...
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