- Location
- Charlotte, NC
might even want to try 32:1. definitely wouldnt hurt. post some pics of your creature craft
2 seized engines, need help with jetting.
- Thread starter ClassVgear
- Start date
- Location
- Charlotte NC
Guys... oil isn't his issue.
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
So 1:1?
- Location
- Charlotte NC
Nimmer705
Big Bars
- Location
- haliburton ontario
What about your stator? Is it aligned right?
- Location
- Boise, Idaho
Compression is 170 in each cylinder. Riva told me that I should be good for pump gas.
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- Location
- Boise, Idaho
- Location
- North Central Pennsylvania
Whats the other piston look like.
High Speed Industries
Your one stop shop for quality parts @highspeedind
- Location
- Lake Havasu City, AZ
Is there any fuel spraying back out of the carb while the engine is running with the flame arrester removed? I've seen questionable reeds reduce pulse line pressure and cause a lean condition. I'd also suggest getting an actual flame arrester for it. Running the carb wide open can change the fuel requirements for your engine.
Here is how I'd go about the problem after reading the last few posts.
1. Verify that reeds are in good condition.
2. Verify that carb internals are in good working order. Only use genuine mikuni parts as replacements.
3. Install a functioning flame arrester.
4. Add dual cooling to help control cylinder temperature.
5. Have fun.
If you need anything to get the repairs going shoot me a message. I have gaskets, reeds, individual carb parts ect. In stock and ready to ship.
Here is how I'd go about the problem after reading the last few posts.
1. Verify that reeds are in good condition.
2. Verify that carb internals are in good working order. Only use genuine mikuni parts as replacements.
3. Install a functioning flame arrester.
4. Add dual cooling to help control cylinder temperature.
5. Have fun.
If you need anything to get the repairs going shoot me a message. I have gaskets, reeds, individual carb parts ect. In stock and ready to ship.
- Location
- Boise, Idaho
I haven't checked that, but will the next time out. Everything inside the carb is good. Pop off reads 20psi. Checked 5 times. Same each time. Engine is uber sealed! Held 10 psi for over 3 hours. I had to release the pressure to continue. Thanks ill definitely keep that in mind. Btw the front piston looks perfect minus the wash!
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- Location
- Boise, Idaho
I don't think so. There would be white foam if it were. Ill check the next time out. They are the stock reeds. Everything inside the carb is good, it's new. Pop off is set at 20psi. Check 5 times the same each time. Engine is uber sealed! Held 10psi for over 3 hours. I had to release the pressure to continue the build. Thank you I'll keep that in mind if it doesn't work this time.
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- Location
- Boise, Idaho
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
Probably not your issue but noticed you are running single cooling. With that much weight/resistance motor may be getting to warm
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
PS: badass build. Hope to see some video of it soon
- Location
- North Central Pennsylvania
If the other piston dome is clean check exhaust manifold for warpage which can let cooling water into chamber.
- Location
- South Africa
How hot does the engine get? Big hull to push = more heat.
How does your water routing run?
How does your water routing run?
Magnum Mike
Site Supporter
listen to Augustaf and verify your octane vs dome cc's and bore diameter with RIVA. mention your use case too: big hull that has lots of surface area in contact with water. Since you have been through this twice already maybe go back to stock compression until all other issues are ironed out.
The pic of the 82.75 shows 1 corner, is there scoring on the other 3 corners? If you can post pics of both pistons in the the 82.75 and 83 sets. Show all sides and the tops of all 4 pistons.
Good reading material here http://www.groupk.com/tec-seizures.htm and here http://www.groupk.com/tec-rearseize.htm
going 40:1 and dual cooling will not solve the root issue but will give you more margin for error. Groupk recommended 40:1 when a 701 was in the waverunner 2 hull http://www.groupk.com/y753b2.htm GroupK also recommend 40:1 when a 650sx that was 50:1 stock is modified, 32:1 when a Factory Pipe is added http://www.groupk.com/restof650k.htm . I have not ridden with anyone running a modified engine with less oil than 40:1. Maybe they are out there but 40:1 is much more common.
The pic of the 82.75 shows 1 corner, is there scoring on the other 3 corners? If you can post pics of both pistons in the the 82.75 and 83 sets. Show all sides and the tops of all 4 pistons.
Good reading material here http://www.groupk.com/tec-seizures.htm and here http://www.groupk.com/tec-rearseize.htm
going 40:1 and dual cooling will not solve the root issue but will give you more margin for error. Groupk recommended 40:1 when a 701 was in the waverunner 2 hull http://www.groupk.com/y753b2.htm GroupK also recommend 40:1 when a 650sx that was 50:1 stock is modified, 32:1 when a Factory Pipe is added http://www.groupk.com/restof650k.htm . I have not ridden with anyone running a modified engine with less oil than 40:1. Maybe they are out there but 40:1 is much more common.
- Location
- Boise, Idaho
Thanks Mike, at this point I don't have any other option than to try stock compression or race fuel. Just seized another piston!
. Just got off the phone with Riva and they say I'm good at 93 octane. My region only has 91. Most likely that's the the issue. Since intake side seizures is always lubrication failure, as far as I understand. Ill post pics as soon as I get them out. Thanks againSent from my SM-G930V using Tapatalk