rear cylinder goes boom !!

nikad58

1974 YZ 701
Can anyone see why my rear cylinder went BOOM ??

just a hint.. don't use cheap hoses for your pulse lines no matter how cool they look ! when the engine was hot it closed off much more..
what a pisser !!
 

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Location
Ohio
I'm going to check mine right now!!!! And all of my friends!!!

I think were using the same line but I think I remember having to redo it cuz I thought it was to short.
 

waxhead

wannabe backflipper
Location
gold coast
ah nikad your problem is you have th epumps in and its a short tight radius
If you turn it so the pumps are out you get better throttle response as well as you can use your cheap nasty line
I know i am using the cheap nasty line as well
 

nikad58

1974 YZ 701
its my new Jr's cylinder !! what the reason for turning around red tops or black jacks ?

sucks for that luck, im sure ya got the parts to fix it though......right?

Im not sure how bad it is yet.. i'm hoping just a piston then yes i can hone it and it's back together but if it needs a bore it will be a little while before its running again.. IT WILL BE RUNNING BEFORE MEXICO and pismo
 

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SUPERJET-113

GASKETS FOR CHAMP BRAP!
Thats how Pro-tec set up my carbs.
Better signal, hence better throttle response.
Remember Butch when i got the square back together about 6 moths ago, you asked me why i had my carbs backwards like that?
 

nikad58

1974 YZ 701
silly people.. i asked "why would i turn red tops or black jacks around" black jacks/red tops dont have the same circuitry as a normal carb.. the gas enters the throat via lots of little holes all the way around.. not from a spray bar..

or are you talking pulse signal to the fuel pump ?

my cylinder looks great !! just a hone/rings and its a runner !!
 

Matt_E

steals hub caps from cars
Site Supporter
Location
at peace
The throttle plates still open the same. I believe that has something to do with the better response, too.
 

nikad58

1974 YZ 701
ok fine.. i guess im a hard head.. im not going to turn the carbs around !! I am just going to lift them straight up.. then turn the ski around !! then reinstall them after drilling/taping a throttle cable holder... hahaha
 

crammit442

makin' legs
Location
here
its my new Jr's cylinder !! what the reason for turning around red tops or black jacks ?



Im not sure how bad it is yet.. i'm hoping just a piston then yes i can hone it and it's back together but if it needs a bore it will be a little while before its running again.. IT WILL BE RUNNING BEFORE MEXICO and pismo


It has nothing to do with more signal or better response. It's to move the vent hole in the cover away from the exhaust tube so it doesn't get covered up.(on a superjet)

Charles
 
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