INVADER CYLINDERS ON 4/6 ? WOULD IT WORK?

[sxrsist]

MY 4/6 CYLINDERS ARE JUST A BIT TO SCORED, MAKING 100 PSI ON ONE SIDE AND 110 PSI ON OTHER. ITS JUST A BAG OF GARBAGE DOWN LOW AND HAVE TO COAX TO GET GOING.RACES ARE IN 6 DAYS AND I HAVE A NICE SET OF REGULAR INVADER CYLINDERS I COULD USE.I ASSUME THE DUAL PLUG HEADS WOULD BOLT RIGHT ON ALSO? WOULD THE BE WORTH DOING ? IM SENDING OUT MY 4/6 TOP TO RENIK BUT BE TWO WEEKS. ALTHOUGH ONE INVADER CYLINDER HAS A BROKEN STUD IN IT. ANY IDEAS HOW TO REMOVE?OOPS! Didn't realize i was yelling

[Interceptor398]

Invader cylinders should work fine.  I've not tried it but see no reason for it to not work?

[gixxer6]

They will work, but expect a noticeable performance decrease. 

I have a NOS 4/6 cylinder for sale if that helps. 

[kawhead]

should work well....interesting to see the performance difference.....70 hp stock invader, plus 3 for dual pipes....1 or 2 for quad plug....77hp stock 4/6 as I recall.....

[sxrsist]

They will work, but expect a noticeable performance decrease. 

I have a NOS 4/6 cylinder for sale if that helps.

was going to buy yours till i found out i can renic the pair of mine for 425.00 fotr the pair. they say nikasil way touger then chrome thats my plan

[jimvw57]

not sure the 4/6 heads will work as the firing of the plugs may make things worse. I would wait for the right parts and then go from there.

[Lloyd (ljm)]

4/6 heads will work fine on Invader jugs.   Lots of Liquifire's running around with 4/6 heads

[sxrsist]

should work well....interesting to see the performance difference.....70 hp stock invader, plus 3 for dual pipes....1 or 2 for quad plug....77hp stock 4/6 as I recall.....

My thoughts exactly.  Only difference I can see is the extra two small transfer ports.  And the 80 Ltd was 4/6.   I bet would be a very small difference

[kawhead]

I was going to use 4/6 heads on an invader motor but I scored a 4/6 jug at Waconia, last piece I need for a 4/6 top end so if std invader pistons work that's the new plan....

[Lloyd (ljm)]

 You will have to check and see if the ring gap crosses a port in the cylinder. Some of the aftermarket Invader pistons will work on a 4/6, some won't. Seems to be a difference in the production run of the pistons.

[sxrsist]

the spi i got clear the 4/6   but just barely

[Teherr]

I have heard you may be better off with invader heads on 4/6 cylinders.  Grind the transfer port webbing out in the top half of the crankcase.  Very few engines have that web, including the 81 -82 LTD.  I am not convinced that quad plugs is any real advantage. 

[Interceptor398]

The weekend of the Waconia ride in with the Kawasaki R&D guys there and the discussion turned to quad plug engines.  It turns out that the aviation market was a big part of the reason for the quad plug ignition, aka ultra lights.  The quad plugs engines are much less likely to fail and fall out of the sky.  Performance was part of the reason but not the main reason----if I heard correctly.

[gixxer6]

The newer Arctic Cat 800 2-strokers have dual plug heads.  It's the first newer sled I've saw with dual plug heads.  There's gotta be some advantage to it...

[kawhead]

I think some modern aircraft have dual complete  ignition systems, if 1 fails it still runs....dual plugs are intended to increase timing but maintain a smooth flame front as I recall.....very small gain imo