yamaha under whater?

[tommijommi]

Re: yamaha under whater?

Originally posted by BenC:<br /> start by cleaning your carbs tommi. no you cant do it yourself. they need to be setup with an intake vacuum tool, engine running. if this doesnt work move on from there.

can i not clean my intake by my self?<br />i have removed and clean the intake my self

 

[tommijommi]

Re: yamaha under whater?

Originally posted by tommijommii:<br />

Originally posted by BenC:<br /> start by cleaning your carbs tommi. no you cant do it yourself. they need to be setup with an intake vacuum tool, engine running. if this doesnt work move on from there.

can i not clean my intake by my self?<br />i have removed and clean the intake my self

i mean the carbs

 

[bigbrownbuku]

Re: yamaha under whater?

if you have had the carbs off and apart tommi<br />they are setup wrong and that motor will never run right. you cannot set those carbs up by ear, it cant be done. you need to hookup an intake vacuum tool to balance them.

 

[tommijommi]

Re: yamaha under whater?

Originally posted by BenC:<br /> if you have had the carbs off and apart tommi<br />they are setup wrong and that motor will never run right. you cannot set those carbs up by ear, it cant be done. you need to hookup an intake vacuum tool to balance them.

intake vacuum tool what is that ?<br />can i bye intake vacum tool?<br />or does i have to deliver the whole engine to dealer or just the carbs?

 

[rodbolt]

Re: yamaha under whater?

tommy<br /> to properly set the carb shutters takes a tool called a manometer. it reads vacum off all 4 intake ports. the exact setting procedure is in the book.<br /> you can remove dissasemble and clean the carbs without it. odds are the idle will not be stable,however I have seen it done without the manometer. the F80 should Idle at 5*ATDC not tobe confused with BTDC. if the TPS is bad or disconnected it willlockat about 7*BTDC. will cause a high unstable idle.<br /> did you index the flywheel and check for crossfire like I described or are you not sure what is going on? you have ign timing on all 4 cylinders. if all is normal you check/set it off #1. however something is not normal with your motor hence the backfire. there are very few causes for a back fire. we just have to isolate which one is causing yours. that is why I asked to index the flywheel and check all four

 

[tommijommi]

Re: yamaha under whater?

Originally posted by rodbolt:<br /> tommy<br /> to properly set the carb shutters takes a tool called a manometer. it reads vacum off all 4 intake ports. the exact setting procedure is in the book.<br /> you can remove dissasemble and clean the carbs without it. odds are the idle will not be stable,however I have seen it done without the manometer. the F80 should Idle at 5*ATDC not tobe confused with BTDC. if the TPS is bad or disconnected it willlockat about 7*BTDC. will cause a high unstable idle.<br /> did you index the flywheel and check for crossfire like I described or are you not sure what is going on? you have ign timing on all 4 cylinders. if all is normal you check/set it off #1. however something is not normal with your motor hence the backfire. there are very few causes for a back fire. we just have to isolate which one is causing yours. that is why I asked to index the flywheel and check all four

hello rodbolt<br />when i was checing the timing yesterday the timing was juping from 0* to 7* tdc on all 4 cylinders.. to day i will take off the flywheel <br />and chek for salt under there .. or what do you think coud be the problem is the timing supose to jump like that ? <br /><br />... the backfire is coming out all the 4 carbs intake

 

[tommijommi]

Re: yamaha under whater?

and i have checked the compression and it was 180 psi on all the 4 cylinders. is that what it supose to be?

 

[rodbolt]

Re: yamaha under whater?

I explained once the causes of a backfire. now you have to eliminate each part as a cause or not. saltwater plays havoc with electronics. the timing should remain stable. if it does not suspect a bad TPS or or a bad set of pulser coils. without a service manual it will be difficult to find. it could also be the computer is toasted. that was the reason to INDEX the flywheel to determine were the proper cylinders fireing at the proper time.<br /> while the engine is cold timing may vary to maintain idle speeds. after warm up it should remain fairly steady. once its determined that ign is at the proper time on the proper cyl. its time to move on to fuel. does it backfire while just idling? what steps were performed to preseve the motor after sinking ?