Foul play (Choke plunges?)

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2002tiil
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Foul play (Choke plunges?)

#1 Post by 2002tiil » Thu Sep 08, 2016 4:07 pm

Hi,

My RZ500 started to bog, needed clutch to drive away: So i changed the plugs.
Drove ca 5 miles, the same issue accured.
Another set of plugs didn't help. 2 pipes were smoking , other 2 less. After dismantling the bike i looked ad the choke, 2 cables were loose ,looked like the plungers don't go down to close the hole off.
Polished the plungers, greased them with 2 stroke oil: Didn't help. Cables greased, nothing. Cables are going easy, maybe wrong routing? If i pull at these cables a little, sometimes it goes all the way (looking at the choke lever side).
Tried something drastic: Installed an extra spring, that allso didn't help.

Am i starting to get nuts or doing something wrong?

The right side was the first issue, at last you can see 2 above and the left down cilinder.

Image

Thanks for help in forward,

Richard

silverstrom
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Re: Foul play (Choke plunges?)

#2 Post by silverstrom » Thu Sep 08, 2016 9:50 pm

The 4 cables are all different lengths. Do you have the correct 4 cables and are they in the correct positions?

2002tiil
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Re: Foul play (Choke plunges?)

#3 Post by 2002tiil » Fri Sep 09, 2016 4:20 am

I have the correct cables, that's for sure.
If they have the right routing: I don't know what the routing should be: Cables for the right side carbs are under the "thermostat" housing, above the sparkplugs of the upper cilinders.
Or should they run over the water hose, just narrow under the frame?

Pic of right side of engine:

Image

Pic choke lever side

Image


Length: Longest one is now on the right down, second longest on the right upper one.


Thanks for help,

Richard

2002tiil
Posts: 140
Joined: Mon Jun 01, 2015 5:49 pm
Location: Veendam, the Netherlands

Re: Foul play (Choke plunges?)

#4 Post by 2002tiil » Fri Sep 09, 2016 11:17 am

Okay, choke plunger problems solved: Only one was sticky. The other one looks like it didn't go in all the way, but measured cable length and depth of plunger hole, cable is longer then the movement of this plunger.
Cable routing is solved by pics on the net.
Problem solved then? No, at least one carb gives too much juice, next step will be ultrasonic cleaning the carbs. Maybe tomorrow...

Thanks Silverstorm for the reply!

Richard

vma500
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Re: Foul play (Choke plunges?)

#5 Post by vma500 » Sat Sep 10, 2016 9:53 am

Hi , try loose the choke assy from the airfilter and drive a while like that see if it improves, also renew the airfilter,
my bikes :RD500 2X ,RD 350 F2 , RD 350 31K,RD350 4LO,RG500,RG250 WW,RGV250,TZR250 3MA,TZR250 3XV,NS400r,NSr250 mc21,KR1250S,

2002tiil
Posts: 140
Joined: Mon Jun 01, 2015 5:49 pm
Location: Veendam, the Netherlands

Re: Foul play (Choke plunges?)

#6 Post by 2002tiil » Sat Sep 10, 2016 10:42 am

I drove without the choke lever on the airfilter housing, didn't help.
What could be the issue with the air filter?

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Re: Foul play (Choke plunges?)

#7 Post by vma500 » Sat Sep 10, 2016 2:04 pm

After long time they fall apart and got sucked into the carbs and engine , and block the airholes in the carbs or else
they re too dirty, wet that it ll richen the mixture
my bikes :RD500 2X ,RD 350 F2 , RD 350 31K,RD350 4LO,RG500,RG250 WW,RGV250,TZR250 3MA,TZR250 3XV,NS400r,NSr250 mc21,KR1250S,

2002tiil
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Location: Veendam, the Netherlands

Re: Foul play (Choke plunges?)

#8 Post by 2002tiil » Sun Sep 11, 2016 6:45 am

Makes sense, i'll look in to it.
Bedankt voor je info, maar deze luchtfllter zit er nog maar een jaar in, maar ga toch ff kijken.

Ries

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Re: Foul play (Choke plunges?)

#9 Post by vma500 » Sun Sep 11, 2016 7:18 am

It starts to bog from start riding or after a while ?
my bikes :RD500 2X ,RD 350 F2 , RD 350 31K,RD350 4LO,RG500,RG250 WW,RGV250,TZR250 3MA,TZR250 3XV,NS400r,NSr250 mc21,KR1250S,

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Re: Foul play (Choke plunges?)

#10 Post by vma500 » Sun Sep 11, 2016 9:29 am

Was working today on my rd , thought again about ur problem , so it s 2 cilinders that work lesser
so u need to search something that the barrels have in common like ignitian coil etc , since they all 4have chole
plungers u can rule that out
my bikes :RD500 2X ,RD 350 F2 , RD 350 31K,RD350 4LO,RG500,RG250 WW,RGV250,TZR250 3MA,TZR250 3XV,NS400r,NSr250 mc21,KR1250S,

2002tiil
Posts: 140
Joined: Mon Jun 01, 2015 5:49 pm
Location: Veendam, the Netherlands

Re: Foul play (Choke plunges?)

#11 Post by 2002tiil » Wed Sep 14, 2016 3:08 am

Bogging starts when the engine was getting on temperature, but
Solution:

1 Float level: Out of range, done.
Checked the pilot jets: 3 were closed, opened them, done. Idle speed must be adjusted, was 3000 rpm...
I'm getting handy with carbs, don't need to get the carbs completely off to do it :smt002
Drove the bike, not 100 %, but 150% better then before. Checked the pilot air jets, one was closed, opened them: Done.

To be sure, i did some carb cleaner in the gasoline, haven't tried it, but i'm pretty sure it's okay now :smt006

Honoustly: My NS400R is more reliable then the RZ...

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two-stroke-brit
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Re: Foul play (Choke plunges?)

#12 Post by two-stroke-brit » Wed Sep 14, 2016 2:11 pm

do you have inline filters to save the pilots from getting blocked?
She might not be pretty but always a fun ride !!

2002tiil
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Re: Foul play (Choke plunges?)

#13 Post by 2002tiil » Thu Sep 15, 2016 3:35 am

No, i have no extra filter installed.
What causes this problem i can only guess.
Could it be some paint what came in the fuel tank?
Could it be some rubber parts out of the new fuel lines?
Could it be some oxidation after ultrasoned the carbs?
Fuel? (Ron 98 is hard to get, using V power that has Ron 97)?

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