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Old April 20th, 2009, 05:49 PM   #1
samuraijunkie
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Question 74 suzuki 250 comprssion question

I've been looking most of the day trying to find what compression this bike should have need some help here.
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Old April 20th, 2009, 06:56 PM   #2
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I just did a compression test on the bike 1st reading after kicking it over 5 times each 107 PSI 2 reading 110 PSi 3rd reading 109 PSI. I think its time for some new rings.
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Old April 20th, 2009, 11:44 PM   #3
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2 or 4 stroke?
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Old April 20th, 2009, 11:46 PM   #4
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my banshee is only around 120psi per cylinder stock
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Old April 21st, 2009, 02:31 AM   #5
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I am only here to give you a heads up. IF you use a car type compression gauge you will have poor readings on compression. your machine should be around 125 psi to run good after 4 cranks. the trick is to use a gauge ment for Bikes & small engines. the bigger long hose set ups for cars waste to much of your compression on making volume in the hose. you need one with a 6" or less hose to acurate.
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Old April 21st, 2009, 07:46 PM   #6
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Quote:
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2 or 4 stroke?
2 Stroke

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I am only here to give you a heads up. IF you use a car type compression gauge you will have poor readings on compression. your machine should be around 125 psi to run good after 4 cranks. the trick is to use a gauge ment for Bikes & small engines. the bigger long hose set ups for cars waste to much of your compression on making volume in the hose. you need one with a 6" or less hose to acurate.
6" of hose from the plug hole to the gauge? The one I used has a quick disconect on it for diffrent plug holes. Should I not trust the readings and assume they are higher?
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Old April 21st, 2009, 07:47 PM   #7
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if you're around 120 psi you should be fine.
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Old April 21st, 2009, 07:50 PM   #8
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I am only here to give you a heads up. IF you use a car type compression gauge you will have poor readings on compression. your machine should be around 125 psi to run good after 4 cranks. the trick is to use a gauge ment for Bikes & small engines. the bigger long hose set ups for cars waste to much of your compression on making volume in the hose. you need one with a 6" or less hose to acurate.

Hmmmm.....never really thought about that.
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Old April 21st, 2009, 08:08 PM   #9
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if you're around 120 psi you should be fine.
its around 110 psi should it be rebuilt?
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Old April 21st, 2009, 08:10 PM   #10
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thats still pretty good. how many kicks does it take to start it cold?
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Old April 21st, 2009, 08:12 PM   #11
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its around 110 psi should it be rebuilt?
depending on the gauge you used its still above the bottom limit of 90 psi, under that you would need an act of God to light fuel in compression
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Old April 21st, 2009, 09:26 PM   #12
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thats still pretty good. how many kicks does it take to start it cold?
it will only start cold on starting fluid, i cleaned the carb and the airbox is clean too, choke dosen't help. But after its ran for about 1-2 min it will start usualy 2-3 kicks, after its been running for about five mins it starts to run rough, also to keep it running you have to give it lots of throtte but it always dies then floods when you try to start it again bad luck i guess.
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Old April 21st, 2009, 09:27 PM   #13
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on some machines hard cold starts are a sign of low compression
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Old April 21st, 2009, 10:21 PM   #14
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so after running this bike getting it warm should the compression get worse or better than when cold?

Cause after the cylinder get hot to the touch it smokes pretty bad and takes lots of throttle to stay running then dies.
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Old April 21st, 2009, 10:31 PM   #15
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if it is a 2 stroke then it will smoke ......however on my 72 yamaha dt250 it runs about 115 and runs fine

sounds like you have something in the ignition or carb messed up to me..it sounds like it isnt gettng enough fuel but sounds like the pilot jet is plugged

is the carb boot in good shape ?
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Old April 21st, 2009, 10:51 PM   #16
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The main jet and piliot jet are both clear, the piliot jet was clogged till i cleaned it, carb boot coming from the air box is good. and coming into the motor it bolts on to the intake no boot between the motor and carb. I'll take pics tomorrow.
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