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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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 Posted: Mon Mar 05, 2012 6:47 pm Post subject: Banshee problem |
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Hey guys,
I've just rebuilt the top end of my banshee with new pistons,rings and full set of gaskets and I'm only getting around 30psi in one cylinder and 80 in the other. It has a pro design cool head which I'm not sure if that's effecting it but it all worked well previous to pulling it apart. I'm majorly stuck and frustrated any help or advice would be worth it's weight in gold!!!!
Thanks for looking 
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doel#20
Blaster class
Joined: 18 Nov 2008
Posts: 155
Location: nw tassie
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| Posted: Mon Mar 05, 2012 7:27 pm Post subject: |
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| did you make sure the ring gaps were off set to each other? |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Mon Mar 05, 2012 7:34 pm Post subject: |
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Ye absolutely I set them up to match the marks on the pistons. Tightened everything up nicely made sure the cone o rings didn't fall out the whole thing is doing my head in!
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1sick6
Big Bore, Stroked & Bling +
Joined: 20 Dec 2006
Posts: 340
Location: SA
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| Posted: Mon Mar 05, 2012 11:16 pm Post subject: |
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Did you put a new o ring kit in the head? Sounds like your compression orings arnt sealing. Also what dome size are you using?
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He Who Dies With The Most Toys, Wins
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Tue Mar 06, 2012 5:19 am Post subject: |
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I did put new o rings through it but may have got dud o rings.
Not sure about the domes they were just on it when I bought the thing.
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greenhuman
Roostin Away
Joined: 12 Feb 2006
Posts: 980
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| Posted: Tue Mar 06, 2012 6:08 pm Post subject: |
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It could be a few things.
You could have snagged a ring on a port and broken a bit off or
a compression O ring may have slipped slightly out of place.
Did you wipe a little bit of grease on the O rings to keep them in place?
Were the cylinders rebored oversize? |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Tue Mar 06, 2012 7:19 pm Post subject: |
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The bores are completely standard, the rings are perfect and I did grease the o rings to keep them in place. I've ordered a new set of orings from the states but if that doesn't work I don't know what it could be I've exhausted pretty much all avenues. Could the bottom end be at fault at all?
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Mart 300r
Roostin Away
Joined: 02 Jun 2008
Posts: 944
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| Posted: Tue Mar 06, 2012 9:47 pm Post subject: |
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This may sound silly,but does it run? Or did you just wanna see what the comp numbers were before you started it and found the prob. does it feel like on the kicker with the plugs in normal or more like 30 & 60 psi would? Reason i ask is compression testers are known for playin up.If those arethe actual numbers well im with the others deffinately somethin wrong. Prob the orings. Nah bottom end cant effect actual compression reading. Still a very good idea after a rebuild to make sure crankcases are sealing but not the prob here. Are the arrows on top of piston facing exhaust ports? Probably cant really effect the reading either but maybe it did snagg a ring with the joins in the wrong position but then again you said the rings were fine.so yeh prob o-rings lol
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE |
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Mart 300r
Roostin Away
Joined: 02 Jun 2008
Posts: 944
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| Posted: Tue Mar 06, 2012 10:38 pm Post subject: |
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Also when you said you rebuilt it did you jus replace pistons an rings back into the bore or did you have it bored and honed?
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Wed Mar 07, 2012 5:49 am Post subject: |
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Definitely won't start I can push the kickstart with my hand fairly easy. The pistons have arrow facing forward I didn't however get the cylinders bored and honed is that where I've gone wrong?
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Mart 300r
Roostin Away
Joined: 02 Jun 2008
Posts: 944
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| Posted: Wed Mar 07, 2012 6:16 am Post subject: |
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Mmmmmmm quite possibly but if it was running okay before you pulled it down. Just gunna have to measure the bores and see if theyve worn. It could still just be the oring or somethin simple though youll find it.
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1984 ATC 300R, 1986 TRX 500R,1984 ATC 200X, ATC 70 WITH CUSTOM LAYDOWN 250R ENGINE, 125CC CUSTOM THUMPSTER TRIKE |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Wed Mar 07, 2012 9:22 am Post subject: |
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Ye o rings are kind of my last option cause I've replaced pretty much ecerything hope that's all it is I've had it 3 months and still havnt rode it
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greenhuman
Roostin Away
Joined: 12 Feb 2006
Posts: 980
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| Posted: Wed Mar 07, 2012 1:40 pm Post subject: |
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Did the head tighten down properly? Pro Design heads are notorious for pulling their replacement head studs out of the cylinders.
Also, how do you know the rings and O rings are all ok. Have you taken the top end back off to check? |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Wed Mar 07, 2012 4:00 pm Post subject: |
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Ye had the head off multiple times trying to figure it out. I've ordered a new set of orings. Been tightening the nuts enough to not strip them but still tight.
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doorslammer
Roostin Away
Joined: 24 Jul 2007
Posts: 902
Location: Northern WA
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| Posted: Sat Mar 10, 2012 9:55 pm Post subject: |
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are your reeds ok? are the sealing?
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01 Banshee
Never take life seriously. Nobody gets out alive anyway |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Sun Mar 11, 2012 7:15 am Post subject: |
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Ye reeds are all good so that's why it's stumped me I've got the clymer manual and have done everything it says and still no go.
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doorslammer
Roostin Away
Joined: 24 Jul 2007
Posts: 902
Location: Northern WA
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| Posted: Sun Mar 11, 2012 7:38 am Post subject: |
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Did you buy the head second hand? It doesn't have stroker domes by any chance?
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01 Banshee
Never take life seriously. Nobody gets out alive anyway |
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greenhuman
Roostin Away
Joined: 12 Feb 2006
Posts: 980
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| Posted: Sun Mar 11, 2012 10:37 am Post subject: |
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| Where are you in Newcastle. We could arrange a time for a look. |
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Nedsta
50cc nipper
Joined: 12 Jan 2012
Posts: 32
Location: Newcastle
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| Posted: Sun Mar 11, 2012 1:33 pm Post subject: |
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The head came with the quad and was working perfectly before ot was pulled down. Not sure if it's got Stroker domes though.
Thanks for the offer of help waiting on some parts gonna see if they fix it I'll let you know though.
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doorslammer
Roostin Away
Joined: 24 Jul 2007
Posts: 902
Location: Northern WA
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| Posted: Sun Mar 11, 2012 11:13 pm Post subject: |
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I thought you put the head on with the rebuild.
What pistons did you use? Wisecos? Is so what series?
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01 Banshee
Never take life seriously. Nobody gets out alive anyway |
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