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#1: DR350 compression

Posted on 2006-04-25 21:55:48 by adam1985

maybe someone here know what is the minimum compression of a dr350
1992?
and also what is the perfect compression ?
(according to suzuki of course)

i need to check if i need to do the top engine, the motor is smoking
like hell...

thenk in advance!

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#2: Re: DR350 compression

Posted on 2006-04-25 22:37:40 by diariodastrilhas

adam1985 wrote:
> maybe someone here know what is the minimum compression of a dr350
> 1992?
> and also what is the perfect compression ?
> (according to suzuki of course)
>
> i need to check if i need to do the top engine, the motor is smoking
> like hell...
>
> thenk in advance!

if it's smoking then you don't need to do a compression test, you need
to do the top end asap, before other stuff is damaged. btw, you'd be
better if you could get a service manual, they aren't that expensive
and will save you a lot of money in the long run. in the sm you have
all measures, clearences, ratios, etc.

hth

Tiago

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#3: Re: DR350 compression

Posted on 2006-04-26 04:52:00 by oscar team

On 25 Apr 2006 13:37:40 -0700, "Tiago Rocha"
&lt;<a href="mailto:diariodastrilhas&#64;gmail.com" target="_blank">diariodastrilhas&#64;gmail.com</a>&gt; wrote:

&gt;
&gt;adam1985 wrote:
&gt;&gt; maybe someone here know what is the minimum compression of a dr350
&gt;&gt; 1992?
&gt;&gt; and also what is the perfect compression ?
&gt;&gt; (according to suzuki of course)
&gt;&gt;
&gt;&gt; i need to check if i need to do the top engine, the motor is smoking
&gt;&gt; like hell...
&gt;&gt;
&gt;&gt; thenk in advance!
&gt;
&gt;if it's smoking then you don't need to do a compression test, you need
&gt;to do the top end asap, before other stuff is damaged. btw, you'd be
&gt;better if you could get a service manual, they aren't that expensive
&gt;and will save you a lot of money in the long run. in the sm you have
&gt;all measures, clearences, ratios, etc.
&gt;
&gt;hth
&gt;
&gt;Tiago

My clymer's manual for that bike does not say anything about what the
compression should be. If this is something that started happening all
of a sudden I would check a few other things first.
1. oil level, it's easy to over fill that bike. Check the oil when the
engine is warm and right after you turn it off. Do not fill it if it
has been sitting for more than a few minutes.
2. check for a plugged crankcase breather hose.
3. black smoke or blue smoke? Blue is oil, black is fuel, possible the
main jet came off in the carb?

If it has allot of hard miles on it you may need a rebuild but start
with the easy stuff, you might get lucky.

Murray

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#4: Re: DR350 compression

Posted on 2006-04-27 22:48:49 by adam1985

thanks to u tooth for the answers!!

i have clymer's manual as well...

the reason why i ask for the compression measure is to know if the ring
is the problem or maybe the problem is smaller like VALVE band...

the smoke color is white (white = oil)

i will check the carb tuning, but i believe its not the problem

yes, its started happening all of a sudden!

oil level - good

the thing is thet the bike is strong! (i live in israel and the bike
eat desert sand every Saturday)

i assuming thet i must go to some mechanic (to rip me of )-: ) to do
some checks...


thanks Tiago and Murray for the help!
(and sorry for my babylon English)

adam.

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#5: Re: DR350 compression

Posted on 2006-04-28 17:06:38 by diariodastrilhas

Adam,

If I were you, I'd replace piston and valves right away. That's what I
do with old bikes anyway. Seems that stock valves don't hold up very
well, when it is time for piston replacement, usually I have one or two
cooked valves in any four stroke engine I've ever seen. I don't know
why this, too hot? Too much abuse? I don't know, but any bike older
than 10 years needs at least one valve replacement. I've seen bikes
needing piston and replacing one valve and six months later it blew
another valve.

The bike is strong, but when you replace the piston it gets stronger.
It goes weaker so slowly you don't feel it loosing power...

btw, how much a liter of gasoline costs in your part of the world?

-- Tiago -&gt; fixing friends bikes as a side business.

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#6: Re: DR350 compression

Posted on 2006-04-29 20:16:19 by adam1985

probable what i will do is the top engine (piston, ring etc'...) but
why replace valves? (they not connected to the oil burn)

if i will replace the piston (do the top engine) , it will bring closer
the end of the low engine?


&quot;The bike is strong, but when you replace the piston it gets stronger.
It goes weaker so slowly you don't feel it loosing power...&quot;
exactly what i was think.

liter of gasoline (octane 95/96) = 6.5 Shekel (1 American dollar
= 4.6 israeli Shekel)

thenks again!!

adam.

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