Elsie questions

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Blacklc
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Re: Elsie questions

#16 Post by Blacklc » Thu Oct 08, 2015 11:19 pm

Funny you should mention slides in wrong carbs! First experience I had with one of these bikes was when someone put slides in backwards! Anyways I checked voltage at battery with bike running and it is over 14v. I've run both stock pipes which I thought were plugged up and the factory pipe products pipes. No difference. Checked flywheel key, is ok. I had trouble with the fuse box already with the lighting fuse. I bought a fuse holder and soldered it in. I realize the fuse box is a weak point, very brittle. I have taken the carbs apart again and the only thing I can find is there is possible erosion in the needle jets. THey do look pretty dull inside. I know that could richer it up a lot but wouldn't think it would be this bad. Seems very odd. Can needle jets and jet needles still be purchased through yamaha? I couldn't find a match in any catalogs at my work.

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JonW
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Re: Elsie questions

#17 Post by JonW » Thu Oct 08, 2015 11:45 pm

Nope the parts are now NLA from a dealer, but maybe via carb suppliers?
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid

Like Watches? www.PloProf.com & www.DeskDivers.com

Blacklc
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Re: Elsie questions

#18 Post by Blacklc » Thu Oct 08, 2015 11:50 pm

I couldn't find in our catalogs. Have to do some more digging I guess!

LC Cnd
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Re: Elsie questions

#19 Post by LC Cnd » Fri Oct 09, 2015 11:11 pm

I replaced my carb needles thru Economy Cycle out of Illinois. Suggest them - great service. Got them last year with the Cnd dollar was close to par - my how things have changed. At the time 2 kits cost $59 and with a 10% discount - just ask. The killer is shipping ($49.95) which most can on the Form attest to in Canada but more so Down Under. Just a note about the new kits - the ends of the needles are tapered thinner than the originals hence I saved mine in case I have problems sync-ing the carbs. Hope this helps.

silverstrom
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Re: Elsie questions

#20 Post by silverstrom » Fri Oct 09, 2015 11:23 pm

I'm sure there are many US members who would be happy to help with shipping. Ship to them and they ship to you. You save 75% on shipping costs and everyone is happy. I have done this myself on occasion.

Blacklc
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Joined: Mon Oct 05, 2015 11:19 pm

Re: Elsie questions

#21 Post by Blacklc » Fri Oct 09, 2015 11:59 pm

Can't find that needle jet anywhere! My carbs are going in the ultrasonic cleaner this weekend. See if that helps. I've been thinking of the spark advance also. I've got a 73 cr250 Elsinore and it has no spark advance at all and is a rocket! Doesn't matter what throttle position either. Will never clean out and rev under load. Pull in clutch and it revs perfect. You'd think there is nothing wrong with it! If nothing else this is very interesting. I've got a buddy that says I can try his cdi box, just in case. Has anybody ran a timing light on there's and watched the advance?

yam4l0
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Re: Elsie questions

#22 Post by yam4l0 » Sat Oct 10, 2015 2:45 pm

The ignition curve programmed into the LC CDI is virtually non existent.

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Blacklc
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Re: Elsie questions

#23 Post by Blacklc » Sat Oct 10, 2015 9:41 pm

Thank you for finding that! There is not much curve there at all. This things got me baffled.

seahorse
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Re: Elsie questions

#24 Post by seahorse » Sun Oct 11, 2015 7:32 pm

Blacklc wrote:Can't find that needle jet anywhere! My carbs are going in the ultrasonic cleaner this weekend. See if that helps. I've been thinking of the spark advance also. I've got a 73 cr250 Elsinore and it has no spark advance at all and is a rocket! Doesn't matter what throttle position either. Will never clean out and rev under load. Pull in clutch and it revs perfect. You'd think there is nothing wrong with it! If nothing else this is very interesting. I've got a buddy that says I can try his cdi box, just in case. Has anybody ran a timing light on there's and watched the advance?
I had a similar weird issue with a recent Rz build, bike would rev on the stand but not under load.
Solved by leaning it off a bit.
I would try the following : squeeze as much oil as you can from the filter, set your clip to pos 2, wind your airscrew out to 1 turn from the bottom. If it doesn't come on the pipe then revert back to original carb settings and look elsewhere .
Not discounting what the other members have suggested.
81 RD 250 LC Hybrid .Widened frame with Aprilia RS250 Back end & Front end, strokd RZ 421, Kennys TSA's, 31KVM26SS Carbs M-360 P-25 ALBA Ndl Pos 3, Air 1.3/4
81Rd350lc resto 2016
81 Rd250lc resto 2017
1999 ZRX 1100

Blacklc
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Re: Elsie questions

#25 Post by Blacklc » Mon Oct 12, 2015 10:59 am

Cleaned carbs in ultrasonic yesterday, reassembled and tried again. Same thing. I've already got the needles in 2nd position. I puttered around on it last night and noticed by turning the air screws farther out it got slightly better. There is a mark on the jet needles. I think it is just very rich. I'm gonna get some new pilot jets as we'll. might be eroded also. Everything overlaps in a carburetor. And I can start it cold and turn choke off immediately so it is pretty rich. Maybe this is the reason it was parked? Can't find stock needle jets. There must be a combination of needle and jet that will work? I can get the needle in a carb kit from keyster. Might give that a try!

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JonW
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Re: Elsie questions

#26 Post by JonW » Mon Oct 12, 2015 6:46 pm

People dont usually say nice things about Keyster, I would buy from Economy, Norbo etc etc not ebay or your local shop, the specialists know what works.
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid

Like Watches? www.PloProf.com & www.DeskDivers.com

silverstrom
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Re: Elsie questions

#27 Post by silverstrom » Mon Oct 12, 2015 9:18 pm

Keyster isn't all bad. They are made in Japan. I have 4 of their kits in my RZ500 and it runs flawlessly.

Blacklc
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Joined: Mon Oct 05, 2015 11:19 pm

Re: Elsie questions

#28 Post by Blacklc » Mon Oct 12, 2015 10:24 pm

Today I dropped the needles to lowest position. Now it is a little lean right off idle and if I just roll into it very gently it will hit 6000 rpm and just start to pull then break up again. It's got to be the needles and needle jets I'm thinking. If I pin it it won't pull at all. Sounds crazy rich but also sounds like it loses a cylinder at the same time. It's a million times better than before but still awful! Yambits has some reproduction needle jets. These are the only ones I can find. I've got floats set at 21mm by the way.
Any other thoughts?

yam4l0
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Re: Elsie questions

#29 Post by yam4l0 » Tue Oct 13, 2015 4:35 am

Needle jets are still available from Yamaha p/n 4L0-14141-42, unfortunately the needles are NLA.

seahorse
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Re: Elsie questions

#30 Post by seahorse » Tue Oct 13, 2015 5:16 pm

Off the top of my head vm26ss carbs stamped 4LO & 4LI (RDLC) and the later 29L and 31k RZ share the same emulsion tubes.
The needles are different across the range. The later RZ 5KI needles are the sought after ones, and are the longest.
Post up what is stamped on the side of the needles you are running at the moment. ( they are marked just near the clip grooves) you will need a magnifying glass to read.
I may have a spare set of RD350lc oem needles.
If you have the wrong needles in, combined with jets that you don't know the history of, then you may never get that bike over 6000 revs.
Remove the main jet and washer and push the emulsion tubes out through the top of the carb and check the numbers on them as well.
Keep in mind you may not know the history of your main jets, and someone in the past may have drilled them. It would be worth ordering a new set, very cheap insurance.
81 RD 250 LC Hybrid .Widened frame with Aprilia RS250 Back end & Front end, strokd RZ 421, Kennys TSA's, 31KVM26SS Carbs M-360 P-25 ALBA Ndl Pos 3, Air 1.3/4
81Rd350lc resto 2016
81 Rd250lc resto 2017
1999 ZRX 1100

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