my 84 R engine had about 100-120 lbs compression (can hardly read the damn gauge.). well, for as stiff as this thing is to kick over, and as well as the thing runs, this couldnt be right, could it? the gauge probably lying to me?
My other user 3WW ID was Nitebiker07.
Teaching quads a lesson
my 84 R engine had about 100-120 lbs compression (can hardly read the damn gauge.). well, for as stiff as this thing is to kick over, and as well as the thing runs, this couldnt be right, could it? the gauge probably lying to me?
Power User
Got the holeshot
are you using an adapter that has a full 3/4" of threads? It makes a big difference. Does the directional valve hold over 120 psi? You might try the guage on a different engine to see... Are you crankin the engine with the throttle wide open?
Just Too Addicted
Arm chair racerJust too addicted
If it runs good then why worry about the compression?
'85 Honda 250ES Big Red
'97 Polaris Sportsman 400 4x4 2-stroke
'04 EZGO TXT
Former trikes;
85 & 86 ATC 250es Big Reds, 200e, 185s, 200s, (2) '84 250r, Yamaha 175 2-stroke, ATC 70, (2) ATC 110, TriZinger 60
***GOD BLESS AMERICA AND OUR TROOPS***
Power User
Got the holeshot
For future reference so you test the condition of the ring seal...Originally Posted by bigreddaddy
My other user 3WW ID was Nitebiker07.
Teaching quads a lesson
nope, i am pretty sure it is short, maybe a half inch?
you lost me at the directional valve? the gauge goes to like 250 or so.
as for trying it on a different engine, no good, as i have nothing to compare it to?
nope, no crankin with the throttle opened at all.
that, and im trying to figure out if i need to run a higher octane than 93 pump......
Power User
The day begins with 3WW
does it knock when runnign or under load if it doesnt detonate your fine.
ok here goes, 85 atc70,2 84 atc70's 83 alt50,83 atc110 , 70 us 90 parot green, 85/86 350x garage queen, stock rider 85 350x, project 85 350x 85 250r drag bike, 2 85 250sx's, alt185, , scat tracker?99blaster,85 250r rider,85 250r ice racer project ,93 kx500,99 xr200r, 91 dr250s ,89 lt500 quadzilla,88 lt250quadracer, 88 trx250r race full on race quad,, 01 yamahakodiak400, kawaki kd100,lt50 for my doughters,93 300ex, 230 quadsport, lt185, lt250 quadrunner,84200s, is that enough?
Power User
Got the holeshot
You have to have it at wide open throttle to test and crank it over several good kicks.
The person who says it cannot be done should not interrupt the person who is doing it.
Rides
85 ATC350X
85 ATC200X
My Feedback http://http://www.3wheelerworld.com/...-for-Erics350x
Power User
Got the holeshot
By using the hose adapter with only 3/8" reach it adds volume to the chamber during testing that would normally be taken up by the spark plug... so be sure to use same guage set-up next time for comparison, or else your results will vary...
Thats why your guage readings are so low... Always test at wide open..
Most guages have a pair of shraeder valves in them that traps the pressure in the line... if one of the valves is only holding 120psi for example, then thats all that will show on the guage even if the engine is putting out 200psi...
Too many varibles for cranking pressure to be an adequate indicator of fuel requirement... My Lt would run on pump fuel at 215psi with no audible detonation...
Last edited by cr480r; 04-09-2008 at 09:10 PM.
Power User
Roostin Away
some gauges have really long hoses my tecate read 225 with a short hose gauge and 200 with the long hose gauge. you have to determine your compression ratio to know if you need race fuel... always good to measure the squish too.
Just Too Addicted
Arm chair racerJust too addicted
Oh ok. I was just wondering since you've had so many problems with it before I figured you would just be riding it HARD. Good luck with her.
'85 Honda 250ES Big Red
'97 Polaris Sportsman 400 4x4 2-stroke
'04 EZGO TXT
Former trikes;
85 & 86 ATC 250es Big Reds, 200e, 185s, 200s, (2) '84 250r, Yamaha 175 2-stroke, ATC 70, (2) ATC 110, TriZinger 60
***GOD BLESS AMERICA AND OUR TROOPS***
My other user 3WW ID was Nitebiker07.
Teaching quads a lesson
well thats just it. i dont know. after it gets warmed up, the mid-throttle range gets this funny clunk/rattle/i dont know how to describe it, other than it kind of reminds me of minor piston slap. but only when its warm, and only in the mid-throttle range.
well thats the problem. i was, and thats how i found my main is too lean. everything else is dead on, so the plug gets a nice color, but use WOT for more than a few seconds at a time, and the plug slowly goes white......
long story short i locked the turd up......rippin along, then STOP. still has the same compression/kick feel as before, and still runs awesome, so i got lucky.......
and yes, i know cranking pressure isnt the only determining factor. The owner of PR Racing has built 2 strokes that crank about 260-280 pounds, and still run on a 50/50 mix with no problems at all. thats NUTS.
First Time Rider
Arm chair racerNew to the board
compressoin has no bearing on fuel/oil mix
Current bikes:
85 1/2 Tri-Z (black/red)
84 T3 restored
84 T3 unrestored for gettin'
84 T3 money pit
86 350X 13.5:1 full race
84 250R beater
96 blaster CT sonic 240 kit 38mm airstryker carb 42HP!!
Past bikes:
85 TRI-Z
84 200X
87 200X
86 350X
82 250R
84 250R beater
84 TRI-MOTO 125
83 ATC 110
70 US 90
87BW 200( I know its not a trike but...)
Power User
Got the holeshot
he is refereing to 50% race gas/ 50% pump gas... not pre-mix ratio
try lowering your needle clip position... if that doesnt work then its probably time to buy some good fuel...
the KX engine in my tecate cranks 270psi... it runs well on a 50/50 blend... it might even run ok on pump... but I havent had to try that yet....
Last edited by cr480r; 04-10-2008 at 02:53 AM.
My other user 3WW ID was Nitebiker07.
Teaching quads a lesson
thanks for clearing that up.
well, i need to richen the main first.
now, you are referring to dropping the Clip so as to RAISE the needle and richen the circuit, correct?
Reply With Quote
