My (Daytona?) "Freeride" SuperJet Project

[Sanford]

I took carbs off again and I found something. The low jet on the seized carb has a TINY particle sitting next to the jet hole. It wasn't blocking it but it could have blocked it....seized...then after turning motor on/off 3 other times it could have dislodged again. So far that has been the only actual culprit (besides the odd higher than should have 195psi compression)...yet it wasn't blocked when I took it apart. However, this MAY explain why it ran so good up to that short second.

I could care less if I had to buy a crank, piston or whole motor....I just want that feeling of knowing exactly what caused (the smoking gun theory).

don't forget to check the ring gap, if it's too small the rings will wipe away the lubrication.

Ring gap was within spec (relative to bore/piston clearance). If anything, the bore was .0015 bigger than I would have chosen.

I hope this is .0065" and if it is this is not your issue. If you have 190 comp in bad cylinder, my guess is lack of octane siezer. You said the piston was toast? how? Is it melted, chipped out on exhaust side above upper ring, were they in right? Switch domes to 36cc or run 100 octane.

:bigeyes: Yeah, I meant .0065" :smile:

I said toast in the general sense. Once a piston makes contact with the wall, I don't care how little it is or that I could possibly hone and clean it up. Its toast in my eyes and time for new one. Yep, as I mentioned above, I ordered 37cc domes 2-day air (37cc=170psi 35cc=185psi). Post #47 has pictures of seizure.

I'm running 70 pilots and 135 mains on my stock 701 with bpipe, 38's, and ada head(35cc domes) and it runs perfect. I did go a little fat on my screw settings to play it safe. I dont ever really run WOT either.

Yep and so do many others. Its a straight up simple setup that works. However, I do lots of WOT out on the ocean.

 

[Scorn800]

Did the plugs look wet? like water? Possible head leaking water into cylinder?

 

[douglee25]

Isn't the pilot circuit taken out of the equation on a WOT run? Maybe my memory is incorrect, but I could have sworn the main circuit was only used on a WOT run. If that's the case, that could be the reason why you never felt anything if you were more in the upper end of the throttle range. Once you stepped down, the low circuit came into effect and thus your problem.

Doug

 

[Sanford]

No water leaks. Water doesn't cause engine seizures. If there was a leak in the head, my compression would be lower anyway.

The MAIN jet actually runs operates between 30% to 100% throttle. The whole time I was operating under 50% throttle. I only went past 50% for maybe .5 second at a time (brap).

 

[douglee25]

No water leaks. Water doesn't cause engine seizures. If there was a leak in the head, my compression would be lower anyway.

The MAIN jet actually runs operates between 30% to 100% throttle. The whole time I was operating under 50% throttle. I only went past 50% for maybe .5 second at a time (brap).

Interesting. Well, bore it out and run it!:biggthumpup:

Doug

 

[SkiDaddy]

While it's apart, double check the headpipe diameter per this post:

http://www.x-h2o.com/threads/9561

Probably not the culprit, but it's easy to check....

Good luck with it.

 

[Sanford]

SkiDaddy, your correct but this is a brand new pipe from FP and all the manifolds have been updated.

(I'll update with more completed ski pictures later)

Hopefully I'll see all you mofo's at Daytona!

 

[sjetrider]

SkiDaddy, your correct but this is a brand new pipe from FP and all the manifolds have been updated.

(I'll update with more completed ski pictures later)

Hopefully I'll see all you mofo's at Daytona!

Be there, even if you come w/ parts in a crate. It wont take 3 people 2 hrs. and a 6 pack ea. to have it running.

 

[Sanford]

Be there, even if you come w/ parts in a crate. It wont take 3 people 2 hrs. and a 6 pack ea. to have it running.

:biggthumpup:

Assembly isn't the issue, I can do that in 38 minutes, I need to take my time with the initial break-in and monitor this so it doesn't happen again. If I don't get it done in time I'll be the guy on the beach (Daytona) with the 2ft camera lens :cool2:

 

[RoyalFlush@PCB]

:biggthumpup:

Assembly isn't the issue, I can do that in 38 minutes, I need to take my time with the initial break-in and monitor this so it doesn't happen again. If I don't get it done in time I'll be the guy on the beach (Daytona) with the 2ft camera lens :cool2:

Hey, do you still have a lens or two for sale?

I might be interested if you do.

It will be good to meet you. :biggthumpup:

 

[sjetrider]

:biggthumpup:

Assembly isn't the issue, I can do that in 38 minutes, I need to take my time with the initial break-in and monitor this so it doesn't happen again. If I don't get it done in time I'll be the guy on the beach (Daytona) with the 2ft camera lens :cool2:

Bring it on bro, I will have an extra boat and I am sure many more will as well. :arms:

 

[Nitrousboy1]

Ski 4 daytona

Sanford the offer to take my ski this weekend is still on the table so if you don't get that ski set up, just come by and take my ski. I heard it in the garage last night calling your name!


Oh yeah, that turf job is SWEEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTT!!!!!!!!!!!!!!!!!!!!!!

 

[Big Kahuna]

No water leaks. Water doesn't cause engine seizures. If there was a leak in the head, my compression would be lower anyway.

The MAIN jet actually runs operates between 30% to 100% throttle. The whole time I was operating under 50% throttle. I only went past 50% for maybe .5 second at a time (brap).

actually, the there is enough of a leak, it can "wash" the oil right off the piston causing it to score the cylinder walls.

 

[Sanford]

UPDATE 1/12/07 @ 1:30am: I just finished putting motor back together. Pressure tested it and it held perfect. Redid carbs, changed several 1hr old gaskets with new ones just in case. Increased pilot jet to #75 (from #72.5). Installed new 37cc domes. Basically everything has been gone over once again :bigeyes::bigeyes::bs2::cat40:

I am mentally and physically tired!! I water test in the mornin' :noevil: If all goes well I can then do a few detail things I've been setting aside.

I've got a bunch of new pictures I haven't had the chance to post...will post some when I get the time.

Sanford the offer to take my ski this weekend is still on the table so if you don't get that ski set up, just come by and take my ski. I heard it in the garage last night calling your name!

Thanks bro. However, as I told you, I never like to borrow peoples skis. Different setups and not use to its "feel" can cause accidents (body). Thanks again.

actually, the there is enough of a leak, it can "wash" the oil right off the piston causing it to score the cylinder walls.

Water doesn't wash oil. The real harm in the water is it does not compress or ignite. Which can lead to crushed piston rings. But this would need to be some very obvious (prolonged) water intrusion...the only water found in this motor was in the water jackets :cool2:

 

[Big Kahuna]

Water doesn't wash oil. The real harm in the water is it does not compress or ignite. Which can lead to crushed piston rings. But this would need to be some very obvious (prolonged) water intrusion...the only water found in this motor was in the water jackets :cool2:

after you have a year on your motor, and have gotten a fair amount of waterinjestion, pull the motor, look at the interesting vertical scoring lines......

 

[Sanford]

Was at lake putting time on motor and tweaking, then while sitting on trailer with motor running (adjusting carbs), motor stopped instantly!

Turns out with my luck I sucked the most nasty nylon webbing I've ever seen. It wrapped so tight I couldn't cut it off, of burn it off with the torch. I had to pull pump to get this mess off the driveshaft.

Thats it, I give up...it just wasn't meant to be I guess :banghead::banghead:

I'll screw with my SJ next week.

 

[SkiDaddy]

Well, tomorrow's another day.:woot:

I just spent an hour & a half trying to see why my ski wouldn't start (did get 6 sessions in today before it acted up :arms: ). Turns out it was the starter. What a royal pain to replace! Ready for tommorrow!

 

[Sanford]

Well, time to call this project finished. Technically it isn't, but its finished enough for this post.

Here are some final pictures. Don't mind the graphics, they are temporary until I get my hands on that 40" plotter.

 

[Sanford]

Another 4.

Larger and clearer pictures (with description) on link below in my signature.

 

[RiverRat]

Clean :cheer: Nice job :smile: