bansheeseat$$ Posted April 11, 2006 Report Share Posted April 11, 2006 Ok Guys lets see if any of you can figure this concern out.It's a cheetah power valve top end with stock cr 250 reeds,32mm flat slide carbs,plate set at+4,270 main jets 48 pilot jets needles set in third notch.What happens with this is when I ride it under half throttle it runs great but as soon as I go to half throttle or more it will fall flat on its face and actually almost stop completly.Let me tell you first off that I have allready figured it out but I would like to see if any one else can figure it out,Also buy installing 1.8 air jets in the carbs it helped considerably,HOWEVER THIS PROBLEM IS NOT CARB OR SPARK RELATED.So lets have some fun and see who else may be able to figure it out. Quote Link to comment Share on other sites More sharing options...
reded Posted April 12, 2006 Report Share Posted April 12, 2006 Im thinkin maybe powervalves or busted reeds. I'd hafta personally inspect it in order to figure it out without any more clues. Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted April 12, 2006 Author Report Share Posted April 12, 2006 Not reeds or the power valves.More clues =421cc Quote Link to comment Share on other sites More sharing options...
reded Posted April 12, 2006 Report Share Posted April 12, 2006 I had this problem once when my Outerwears were dirty. They looked good visually but as soon as they were pulled off it ran like a mutha! Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted April 12, 2006 Author Report Share Posted April 12, 2006 No not outer wares.clue #2=Timing but NOT spark Timing. Quote Link to comment Share on other sites More sharing options...
WilliamCote_3 Posted April 12, 2006 Report Share Posted April 12, 2006 I believe that it is your crank. it isn't the right size. Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted April 12, 2006 Author Report Share Posted April 12, 2006 We have a winner.It all started when I bought a complete engine that was soposed to be a +4 stroke and +5 long rod built for drag racin.First mastake I believed the guy.So any way I ran the engine twice and it was not very fast so I took it a part and looked at the porting the guy did on the cylinders and it was lets say CRAP.Mistake #2 I didn't look at the crank itself just the pistons and they were 795 series pistons(long rod pistons).So I decided to build my own hense the cheetah p.v. top end and all listed parts.Mistake #3 still didn't look at the crank.I put it all together and wamo the problem I described in listing.So now I do a compression check 85psi so now I'm like wow to small of domes 20cc at 4000 feet.I bought 17cc domes and now I take the head of to instaal the 17cc domes.Mistake#4 didn't look at piston dtc.Installed 17 cc domes now I have 115 psi WTF WTF!!! pulled the head of again and Finally check piston dtc Big gap Duh.tore it all apart and installed the correct crank No problem after that.That was fun right.This sickness with banshees is f-in great. Quote Link to comment Share on other sites More sharing options...
WilliamCote_3 Posted April 12, 2006 Report Share Posted April 12, 2006 it is great to see that it is running right. leave it to the pros to tyell you the wrong thing. Anyways have fun with the new bansheee. What kind of hp are you putting out? Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted April 12, 2006 Author Report Share Posted April 12, 2006 it is great to see that it is running right. leave it to the pros to tyell you the wrong thing.Anyways have fun with the new bansheee. What kind of hp are you putting out? 500814[/snapback] I'm not sure I haven't dynoed it yet but it runs 6.2 at 100mph in pavement 8th mile,with knobby tires Quote Link to comment Share on other sites More sharing options...
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