Author Topic: 250cc compression??  (Read 1920 times)

Offline nate108

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250cc compression??
« on: November 26, 2011, 05:08:31 PM »
hi i have an australian delivered 250cc bandit
the red vavle cover model with the variable timing

what compression should i be getting ?

i did a compression test and got the following figures but i have no idea if the figures are good or bad
from my limited knowledge i would say they are a bit low but with no workshop manual (which apparently doesnt exist) i have no idea if my numbers are good or bad

cyclinder 1 95psi
cyclinder 2 100ps1
cyclinder 3 95psi
cyclinder 4 100psi

thanks,

nate

Offline interfuse

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Re: 250cc compression??
« Reply #1 on: November 28, 2011, 08:11:13 PM »
According to this website

http://www.synapse.ne.jp/s-hara/bandit/ban-spece.html

You should looking at numbers in the range of

163-192 psi
No more then 28 psi variance between cylinders. 

Use limit 113 psi 

Mike

'91 GSF400
It's more fun to ride a slow bike fast than a fast bike slow.

Offline nate108

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Re: 250cc compression??
« Reply #2 on: November 28, 2011, 08:19:10 PM »
thanks


the bike runs like absolute crap
i got it cheap hoping it was a carbie prob and i could fix it up

but i guess its up for a rebuild

i have a mate who has offered to do it he is a race engine builder
but he needs a complete workshop manual (which doesnt exist)
any ideas if the 400 manual would be ok for him??
« Last Edit: December 21, 2011, 03:38:55 AM by nate108 »

Offline nate108

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Re: 250cc compression??
« Reply #3 on: December 21, 2011, 03:39:30 AM »
anyone?


will the 400 workshop manual work with rebuilding the 250 v?

Offline rider123

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Re: 250cc compression??
« Reply #4 on: December 21, 2011, 06:58:40 PM »
maybe in here?

http://www.carlsalter.com/motorcycle-manuals.asp

You sure maybe the valves are just not out of wack or do you suspect bad rings?
2005 Bandit 1200, Modified Holeshot Stage 1 with 17.5 pilots 2.75 turns out, and 110 mains 5 shims. Muzzy Slip on w/mid-pipe, stock filter. 1.5" hole in the airbox lid.

Offline nate108

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Re: 250cc compression??
« Reply #5 on: December 29, 2011, 02:30:19 AM »

You sure maybe the valves are just not out of wack or do you suspect bad rings?

there is oil on the plugs - but this may be the valve cover - there is no smoke
and it idles ok
there is no power when i turn the throttle it chugs and struggles to rev
if you ride it it barely has enough power to make it up any slight inclines.

any ideas?