Custom/Hybrid Backi-Chan build

[d_moss]

Matt you can but the spark is less and because of that the timing is off hence you need to set base timing manually. At least that's what I understood when I asked atp. I don't know of anyone doing it though

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[rubbertoe]

Well the only reason i asked is you might want to swap for a different ignition and see what happens ? Matt is correct about the stator .

 

[Byeai]

U need to buy timing sticker kit for the flywheel from msd and find top dead center and mark it on the case and then put the sticker lined up with it I think I remember some one saying u have to use tge bottom sticker fly wheel sticker and set a straight curve on ur epic and make sure its correct and adjust from there and u have to cut up a stock cover to hold bendix and timing light will help u see ur mark on the case see wat the sticker says wen running

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[Byeai]

http://pages.ebay.com/motors/link/?nav=item.view&id=310384107663

Note the stock fly wheels are a tad bigger or smaller I forget wat one the timing will be off by a 1/2 degree at 20 degrees

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[rubbertoe]

I would pull a plug off and see if your getting spark every time the piston fires ,make sure your battery is good and your plug is grounded on the motor .if your saying timing is off it might not run or run rough ,but no spark is another .

 

[JetManiac]

Looks fine to me????

That is some kind of a/m stator and I wouldnt use it in any perfromance application but especially NOT with an EPIC!!

I don't think you can run a 61X stator/fw combo with that ignition.

You can, but you need to shift timing curve by 5deg. I know 'Watty' and a few others who have done it.

 

[d_moss]

well after cannibalizing my 98 mint virgin super jet special edition i feel guilty but it was worth it.

But alas one fortune is met by another miss fortune. The same bog issue i have been fighting all year had seemed to have gotten worse.

every time i attempt a sweet trick and hop into the wake then pinch it again to launch off the wake it will fall on its face and i end up falling over. Its as if when the pump is out of the water i let off, then pull throttle as im coming back into the water, the pump loads and bogs the motor. I dont know if its jarring the carbs and causing a lean condition or if the free rev in the air is causing a rich condition or what.

 

[MCrider]

What pipe are you running? Is water rushing up the exh and backing up the flow?

 

[d_moss]

B pipe and stock water box. top screw open a turn i think and flow control valve.

Did this in my RN hull and chan hull.

almost seems to have gotten worse with the cold water but im not for sure.

wasnt there a thread that mentioned installing like 2 or three valve pieces in the carb to help with an issue. I cant remember what issue it was meant to resolve.

oem 760 dual 44 carbs. re jetted i forget the jet specs at the moment. and im at 4500 ft above the sea.

 

[TheBuzzard]

this may not be the problem, but i notice as the weather gets colder i have to open the low screws on the carbs and fatten it up on the bottom, to get rid of a new hesitation. i'm not going to get into the technical reasons why this happens, but just turn the low screws out 1/2 turn each. if its better or gone, great. if not, turn them back.

 

[hink320]

Are you running prefilters over your flame arresters?

 

[d_moss]

I will try that. it seems to idle just a touch low.

I just wish this son of a b would just be dialed and run perfect. I have done more wrench turning that backflip practicing.

 

[d_moss]

stock intake it used to hit the hood btw before some heat gun messaging.

 

[wanderer1]

Adding extra anti siphon valve pieces is for big stroker motors that shake and cause a dribbling. You can see the dribbling at idle, probably not your issue. Mikuni suggests going up 2.5 jet size on pilot when ambient air is 40° less than when originally jetted. Most people just open top screw. If this is something you've been fighting for over a year its time to hammer it out. Good luck and have fun. Edit:I don't remember if it is pilot or main now that I think about it and my book is packed away.

 

[MAH]

Any chance you have a fuel hose covering the hole on the diaphram cover of either carb?

 

[d_moss]

I don't think so I believe there is a decent gap.

The hard part is it's intermittent. If you do the quarter throttle for a while and pintch it, it doesn't hesitate. Or even 1/8 th or half throttle. It only does it full throttle let off for half second as you hit the wave full throttle then bogs and you land on your head

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[Crab]

I don't think so I believe there is a decent gap.

The hard part is it's intermittent. If you do the quarter throttle for a while and pintch it, it doesn't hesitate. Or even 1/8 th or half throttle. It only does it full throttle let off for half second as you hit the wave full throttle then bogs and you land on your head

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momentary lean condition could be:

plugged filter in carb, plugged main fuel filter, kinked line, weak fuel pump or air leak at pulse line....good luck

 

[swapmeet]

I'm seriously reaching, but is your fuel system sealed and holding pressure??
Maybe when you chop the throttle, the lack of pressure doesn't feed the carb and so when you get back on it... Nada.

Or you're sucking air at your fuel inlet and when you pinch it, it's pulling more air, so when you go to grab more, the ratio is goofy.

 

[d_moss]

Thanks for all the help. Filters are all good I was rejetting this summtype er and saw them frequently haha. Swap the tank is prob not holding super good pressure I will double check.

I am running the softest spring and according to the book with the seat I believe it's at 32 pop off pressure with stock tube type intake with no metal screen and still choke butterflys still in.

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[Stblaz08]

after hitting full throttle then hitting again and bog... Sounds like you might not Be getting enoughf air into engine bay?? And your starving it for air

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