News:

Deals Gap 2024: Josh performing parking lot maintenance


Next Year:  May 4-11th.  26th year!
(CLICK IMAGE FOR MEET INFO)

Main Menu

Throttle Slide Not Sitting Flat

Started by davedogg, April 30, 2020, 12:00:21 PM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

davedogg

Hi guys. I have so time on our hands and cleaned the carbs on my RD350. It's been awhile since I cleaned them. When I started back up it was revving high like a runaway. Found out it is the choke side carb throttle slide that will not sit flat. Right carb is good. I was messing with the cable and lock nut on top but not having much luck. Is there a trick to reset the throttle so it sits flat like it should?
1969 Yamaha L5T Trailmaster,  1973 RD350,  1973 Honda CB350G,  1976 Yamaha RD400,
1983 Honda NU50,  1983 Vespa P200, 1997 Honda Nighthawk,  2012 Moto Guzzi V7

m in sc

look for burs on the slide and that the aligning pin in the body isnt loose.

davedogg

Doesn't seem like any burs. When I put the slide in without the cable attached it sits where it should. It seems there is not enough slack in the cable.
1969 Yamaha L5T Trailmaster,  1973 RD350,  1973 Honda CB350G,  1976 Yamaha RD400,
1983 Honda NU50,  1983 Vespa P200, 1997 Honda Nighthawk,  2012 Moto Guzzi V7

m in sc

ahhh. check at and in the cable splitter then.

davedogg

When I tighten the cable on the carb I'm getting a good amount of resistance. Almost like it's twisted.
1969 Yamaha L5T Trailmaster,  1973 RD350,  1973 Honda CB350G,  1976 Yamaha RD400,
1983 Honda NU50,  1983 Vespa P200, 1997 Honda Nighthawk,  2012 Moto Guzzi V7

m in sc

STILL MIGHT BE IN THE SPLITTER. TAKE IT ALL DOWN, GET A GOOD LOOK IN THE CABLE ASSEMBLY.  SORRY CAPS

davedogg

Ok so I checked the splitter. I removed the 2 carb cables to inspect. The one cable end cap stretched and broke from the shield casing which extended the housing therefore making the cable shorter (I hope this sentence made sense). What I ended up doing was switching the cables and it seemed to work. I then had to carb sync because they were all out of wack. Started the bike and it idle perfectly.

Should I invest in new cables anyway? I thought I heard that non oem yamaha cables stink. Is this true?
1969 Yamaha L5T Trailmaster,  1973 RD350,  1973 Honda CB350G,  1976 Yamaha RD400,
1983 Honda NU50,  1983 Vespa P200, 1997 Honda Nighthawk,  2012 Moto Guzzi V7

Jspooner

Quote from: davedogg on May 01, 2020, 10:31:47 AM
Ok so I checked the splitter. I removed the 2 carb cables to inspect. The one cable end cap stretched and broke from the shield casing which extended the housing therefore making the cable shorter (I hope this sentence made sense). What I ended up doing was switching the cables and it seemed to work. I then had to carb sync because they were all out of wack. Started the bike and it idle perfectly.

Should I invest in new cables anyway? I thought I heard that non oem yamaha cables stink. Is this true?

Probably depends where you get them from, but either way a shitty new one is probably better than a broken OEM.
"Just quit brain fucking it and get it done"

SoCal250

If you do go with new cables keep in mind that there are two types -- for high-top carbs and for low-tops.  :twocents:
75 Yamaha RD125B   75 Yamaha RD125B (project)
75 Yamaha RD250B   75 Yamaha RD200B (project)
73 Yamaha RD350     77 Yamaha RD400D   79 Yamaha RD400F  
91 Yamaha TZR250R  89 Yamaha FZR400   05 Yamaha FZ6   
05 Yamaha XT225TC  82 Honda MB5  02 Aprilia RS250 Cup (sold)

RDFL

I've used the 400 cables Old Bike Barn sells they are good, never tried their 350 ones.

Jspooner

Dave..........do you need one of the short cables from the splitter to the carb? I have several that are very usable. I may have what you need.
"Just quit brain fucking it and get it done"

AAAltered

Just an FYI here.  I installed the Yambits R5 repop full throttle cable set just yesterday and found several problems with it.  Both the throttle and both carb cables are shorter than stock, as measured side by side.  Overall it's probably 2-3 inches short.  Then the ferrules didn't fit into the VM tops.

I spent a long time smoothing the ferrules with 80grit, finally got them in and spinning. 

As for the length, the splitter ended up way tucked up forward of the coils.  That's using proper R5 routing.  As of now the cable appears to work, if it give me trouble later in the build I may reroute it right of the steering neck to gain an inch or two.....

Short answer is try to get NOS.
1971 R5
1976 RD200
2022 Moto Guzzi V7 850 Special

davedogg

I think I remember hearing the cable info from Eric. Like that guy knows anything about RDs   :blah:   ;D
1969 Yamaha L5T Trailmaster,  1973 RD350,  1973 Honda CB350G,  1976 Yamaha RD400,
1983 Honda NU50,  1983 Vespa P200, 1997 Honda Nighthawk,  2012 Moto Guzzi V7

SUPERTUNE

I buy motion pro cable materials to make my cables, they are good quality with the lining in them. No lining= junk
Chuck
RD machine work, boring, porting, cranks and engine building.


Chuck 'SUPERTUNE' Quenzler III
Team Scream Racing LLC
1920 Sherwood St. STE A
Clearwater, FL. 33765
cqsupertune@tampabay.rr.com

Dvsrd

Quote from: SUPERTUNE on May 05, 2020, 11:13:10 PM
I buy motion pro cable materials to make my cables, they are good quality with the lining in them. No lining= junk
Chuck
Chuck, you make/assemble your own cables?
Would it be possible to make a set, or an upper cable+splitter for  a 350A with Hi-Top carbs, using a proper 2-1 splitter?
I have removed the Autolube pump for now, and I just don't like the idea of the uneven pull on the 3-1 splitter, sort of cocking the coupler and increasing friction.