Surging and Detonation

BuffaloBFN wrote: Reassure yourself and your boss that you didn't get a lemon; really. All you have is a few maintence issues to catch up with. The condition of the plugs says they may have been there a while and so forth. Don't be upset...just hang around here a while and we'll get you fixed up. Warning, some have cited addiction issues with this site...and you may just catch yourself doing extra maitenance in the future just 'cause you enjoy it. From here, we'll try to help you eliminate potential problems.

Thanks Buffalo and I relayed the info to "the boss"! I will definitely be the addicted kind! I loved working on the c3 corvette and will probably be doing the same with my new toy. I definitely appreciate all the help I can get from you guys. That is why I came here and not to any other forums...you guys are the best!

How much fuel did you have???

What you have ruled out is the antisyphon valve, not a fuel issue yet, if the carb is clogged, it MAY or MAY NOT clear, mostly it wont. So I'd be ordering a rebuild kit.

One more question, did you ran the boat with low fuel on the tank after you bought it? Or you always kept it topped?

Luchog wrote: How much fuel did you have??? What you have ruled out is the antisyphon valve, not a fuel issue yet, if the carb is clogged, it MAY or MAY NOT clear, mostly it wont. So I'd be ordering a rebuild kit. One more question, did you ran the boat with low fuel on the tank after you bought it? Or you always kept it topped?

I filled up a 5 gal tank. I was out for approximately and hour trying to figure things out. I still have about 2 gal. left in tank, but the hose may have been curled inside the tank.

PO said carb was rebuilt approx. 200 hrs ago. Might be a poor job?

I haven't owned the boat long enough to even have gone through the original full tank of gas already in the boat. It currently is at 3/4 of a tank.

Running a can through the tank would be a waste of money.   Get a gallon & a big bucket to put the carb pcs in overnight.

I'm thinking about those plugs. I think someone said the protech can't be tested? That sux.

I'll chime in because my ProTec seems to be on it's last leg. I have similar hrs and mine has never given me any trouble, but as the summer has gone on I seem to be a little down on the power. This past weekend we put 15 or 20 hrs on the boat at an event where we had the boat fully loaded with people the whole time. It the first time I can remember running out of power to get out of the hole.   The boat was still as quick as all the big 24fters there, but I had nothing left when people asked, most didn't notice though.

My ProTec seems to just be getting weak, no sputtering or other issues. Best speed I could manage unloaded this weekend was 41 with the bimini up and 300 lbs of lead in the bow. Both those things aren't helping and I'm going to give her a run this week without them this week to make sure I'm heading in the right direction.   I didn't notice any increased fuel use, and RPM's stayed within reason of what we usually run which is why I'm suspecting weak spark.

You my have 2 issues both fuel and ignition.

KV, Is the sputtering happening while you're up on plane and going along, or more as you juice it out of the hole?

Plugs have a few hrs on them, I pulled them mid summer and they were pretty even. Certainly couldn't hurt though, they have a few hundred hrs and will be replaced anyway with the ProTec. I figure the ProTec is living on borrowed time, with over 900hrs so it's on the winter project list.   I'd rather do on my time than to loose a bunch of water time during the summer.   I've also got a bit of an itch for a little hp upgrade to so I'll probably throw in a cam and and intake while I'm at it and have everything apart.

Ok, I was just curious if it might have been an accelerator pump issue, it sounds like no on that.

kapla wrote: not given! I will sound like pete, in this forum we like to call us by our real names, more than the screen names.

Or did you mean me?

Hello! My name is Kevin

Bri892001 wrote: I sold a pretty mint Harley to buy my boat, sometimes miss it too, but sometimes it's hard to have all the toys. I've been getting a lot more use out of the boat, and family and friends can join in. I think you'll love your boat once you get this sorted. If that fuel sat around since July 4th, I'm guessing it's the source of a lot of your issues. Try adding some Starbrite Startron to your tank, see if that helps matters. Send some detailed pics of your carb if you can. The only thing you can really check easily is the inlet screen, where the line goes into the carb. Make sure you use a flare end (aka line) wrench to undo any brass fittings.

I hear you about not being able to have all the toys! The reason we went to a boat is because My family of 4 cannot fit in a two seater! Plus, my wife and I are both teachers and so we will have lots of family time out on the boat...pending the things runs!

I added some HEET to the tank, but ran the aux. tank yesterday and it still did not want to run right. Either there is something in the carb clogging things up or there is spark issues.

I did check the inlet screen. It had nothing stuck to it at all. I changed the fuel/water separator as well.

I will post some pics of the carb this evening.

Kevin, no offence lol...

debris in carb as for taking appart the primary bowl and looking for some crude in there floating around....your sympthom looks to appear randomly?
Easy check, just need to have spare gasket (blue ones) to put it back toghether.


engine sounds good.
Just normal issues of unused boats..
you will have it sort in no time and will enjoy your boat!!

I totally understand the family and vette thing! lol I have 2 kids so its definetely not a family car! I´ve considered streching it and adding 2 more seats or trading it for a camaro or Mopar of that era...but man the vette is nice!

kapla wrote: Kevin, no offence lol... debris in carb as for taking appart the primary bowl and looking for some crude in there floating around....your sympthom looks to appear randomly? Easy check, just need to have spare gasket (blue ones) to put it back toghether.

Gotcha! I can do that myself. My symptom is consistent. It's more like it randomly (as in once) got up to about 45mph before it started to bog down again. Weird because the week before I took my 3 and 4 year olds tubing for the first time and it ran great with none of the above symptoms!

[/QUOTE]
engine sounds good.
Just normal issues of unused boats..
you will have it sort in no time and will enjoy your boat!![/QUOTE]

Man I hope so!

[/QUOTE] I totally understand the family and vette thing! lol I have 2 kids so its definetely not a family car! I´ve considered streching it and adding 2 more seats or trading it for a camaro or Mopar of that era...but man the vette is nice![/QUOTE]

LOL! Don't get rid of it!! The price of that vette is appreciating like crazy and I don't know that the camaro or Mopar will like the vette will. I know in 10 years I will need some tissue when I look up the NADA value of the vette.

kvand347 wrote:    Weird because the week before I took my 3 and 4 year olds tubing for the first time and it ran great with none of the above symptoms!

now there´s your problem...tubing is BAD...

Sorry! This lower port bolt. I also notice the use of RTV at the base of the manifold/spacer. Is this normal?