'96 GP-200 older thread

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Re: '96 GP-200 thread

Postby spiderwebb » Mon Jun 10, 2013 7:07 pm

"what is that strange sound...??"

I look around and see a drip and notice the exhaust muffler is shaking a bit more than it should...
ride home slow

strip off the tin and see that the exhaust header is way loose...
one of the header studs is missing completely out of the barrel and the other one has the nut just holding on
:shock:

find a spare and took hrs to get her all back together
checked all the barrel nuts for spec and find them all a bit off since rebuild which is normal

hope the jetting wasn't all a waste of time last week
:|
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Re: '96 GP-200 thread

Postby joe » Mon Jun 10, 2013 8:45 pm

did you have a spare stud?

if you're wrenching late in the day, or early evening, let me know. I'll be your beer caddy 8)
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Re: '96 GP-200 thread

Postby Miguel » Mon Jun 10, 2013 9:54 pm

I saw True Value Hardware on Willamette had metric studs in their bolt section last time I was there, probably just need to be shortened up a bit. Did you use thread lock to avoid a repeat performance?
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Re: '96 GP-200 thread

Postby spiderwebb » Tue Jun 11, 2013 10:17 am

Joe - yuuuuuuuuuuuuuup had 2 spares

Pharm Mike - I did used some lock tite
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Re: '96 GP-200 thread

Postby spiderwebb » Tue Jun 11, 2013 2:30 pm

the 28 mm carb (non power jet) as of 6-20-13:
main jet = 130
idle jet = 35
needle / clip = JJK / 2nd
mixture screw = 1 turn out

EGT = max 1300 F
CHT = max 300 F

** When your in my garage have a look at my jetting notebook. Pages and pages of small changes w/ notes of what happened with each jetting change no matter how small. **
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Re: '96 GP-200 thread

Postby spiderwebb » Wed Jun 12, 2013 11:51 am

thanks to English Dave my timing is now set nice and safe
18 degs BTDC
8) 8)

we were thinking about where the timing was when she lived in TX and we determined the last owner had the timing all the way up @ 26 BTDC = was advanced and hot.
:shock: :shock:

When I got the scoot running a few months ago I retarded the timing to be safe and thank the heavens I did that or she might have had a meltdown.
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Re: '96 GP-200 thread

Postby Grahamcracker » Wed Jun 12, 2013 6:16 pm

did you inspect the top of the piston? I would imagine that at 26 degrees and any sustained high speeds would start to eat into the piston
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Re: '96 GP-200 thread

Postby spiderwebb » Wed Jun 12, 2013 10:05 pm

Grahamcracker wrote:did you inspect the top of the piston? I would imagine that at 26 degrees and any sustained high speeds would start to eat into the piston

I retarded the timing to 23 BTDC the day the scoot started for the 1st time by chance and good thing I did. Since then I have not ridden at all that much since I was waiting for a exhaust. I never got up to WOT or held it there for any length of time so all should be good.

It is now @ 18 degs BTDC and shall remain there for time immortal...
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Re: '96 GP-200 thread

Postby spiderwebb » Fri Jun 14, 2013 12:33 am

looks like I am off with my jets

this site has riders using way richer needles and smaller jets to rebalance the mix correctly
http://scootrs.com/tech.cfm?tip=jetpwk

Gearless thinks that this is why I can only get the 1st clip to work at all and have a lean mixture @ 1/2 throttle. I go from a rich idle to a lean mix @ 1/2 throttle and then back to rich which is not safe.

thought something was off
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Re: '96 GP-200 thread

Postby spiderwebb » Mon Jun 24, 2013 3:08 pm

as of 7-22-13...

main jet = 120
idle jet = 45
needle / clip = JJN / 2nd
mixture screw = 1 turn out


EGT = max 1300 F (average is 1100, drops to 950+ @ WOT due to slightly rich mixture)
CHT = max 300 F (average is 250, drops to 225ish @ WOT)
:) :)

JJH needle did not work at all = :(

ps - found a quicker way to "get at" the hidden carb side exhaust nut...!!

** If you get access via the flywheel tin side and have the right shaped wrench it sure makes the job way faster than removing all the rest of the floor boards, rear shock, barrel tin and carb to tighten up / check that one nut for spec. **
:D :D
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Re: '96 GP-200 thread

Postby spiderwebb » Tue Jul 16, 2013 5:56 pm

planning on pulling the rear hub to check the condition of the brakes under there...
- hub is getting way too hot (I can't hold my hand on it) and Vdub says that there might be a loose pad, old pad or some larger issues going on since this a SIL hub and not italian
- might have to do a order if parts are needed but I'll tell y'all in time so you can add to my order

update:
- all cleaned up (sanded, re grease, compressed air cleaned and tightened back up but there does seem to be a issue with the travel of the clutch arm . I, with the help of the Spanners Bible and v-dub, have concluded that this arm is one spline "off" of where it should be...
- I need to have made up a rear hub holder and buy a 120+ torque wrench to finish this up right

this arm:
Image
http://www.scooterhelp.com/genmaintain/ ... rakes.html

might place a order if the next tune up does nothing
shall see
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Re: '96 GP-200 thread

Postby spiderwebb » Mon Jul 22, 2013 8:40 pm

so...

I decided to check out and measure the actual port timings of this stock 200cc SIL barrel with the help of Gearless. Since the pipe is a real expansion pipe I felt the EGT temps were higher than they should be due to the port #'s being a little off...

intake timing is fine
exhaust port timing was a bit low = under 180 degs
and blow down port timing was a tad under the 30 degs wanted

these changes are based around the use of a real pipe and larger carb
a stock pipe and carb would be fine with these #'s

I'll be raising the exhaust port 3ish mm which should get both the previous #'s spot on = 180/30

porting happening tuesday
shall check squish finally and setting that near 1.5mm

Image
Image
Image
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Re: '96 GP-200 thread

Postby spiderwebb » Wed Jul 24, 2013 10:24 pm

temps seem to be a bit safer after the porting mods...!!
300/ 1300

Gearless thinks I am still way too rich
I'll be leaning out the needle and advancing the timing 2 degs to lower the EGT's
the CHT's shall rise a little but I think they shall be fine

my goal is 325/1250
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Re: '96 GP-200 thread

Postby spiderwebb » Mon Aug 19, 2013 3:20 pm

got her all back together once again...
:roll: :roll:

Top Tip

I did a few of Patrick's trick this time around to stop the important barrel nuts from getting loose over time...!!
- Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker:
Image
- use this on all surfaces and also on the threads of the nuts like you would use lock tight

now on the to do list is a timing change = move it from 18 to 20 BTDC
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Re: '96 GP-200 thread

Postby spiderwebb » Fri Aug 30, 2013 4:05 pm

ever have that feeling that your being followed by a Czechoslovakian....??!!

it's true....!!
Image
Image
Image

ran the power threw a unused old seat latch bolt hole then threw the hitch (temporally spray painted black... shall be powder coated after RunFromTheSun).

8) 8)
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