so tired of this carb....


15 replies to this topic
  • shortburb

Posted August 22, 2007 - 07:28 PM

#1

Posted Image


before reading this you must know im not a mechanical newbie (plenty-o-expirience) but when sh*t like this happens i feel like the first kid to break the head of a bolt in 8th grade shop class...


so for 2 days iv been gently attempting to get the siezed hot start plunger out of the carb on my 03 yz450(on the bench, 24 hours soaked in wd40, 24 hours soakd in carb clean).....and tonight afer heating the cast body of the carb (a DRY carb and a match right near the plunger) and frustration i broke a small chunk out of the threads of the hot start (cable) nut with a pik....iv been riding this bike for months without using the hot start and I think im going to JBweld the hotstart plunger closed (if, with an act of congress I can get it back down)...i just want to vent my frustration, has any one else expirienced this or is my fuse super short tonight?

and to top it off, i peeled the scab in betweeen my eyebrows and the side of my nose after taking a dirt sample saturday, and it hurt like a biotch.....

  • Ga426owner

Posted August 23, 2007 - 04:04 AM

#2

Yep I feel your pain...seen it done it. :banghead:
You have to find a high quality penetrating oil to soak it in. Or break apart the cable and drill it out.

After this - I found that a 15.00 Alum. hotstart nut from procircuit or Zipty along witha dab of grease will keep this from ever happening again....but most owners do not get it and choose to keep the oem plastic nut that leaks water right in and causes this:thumbsdn:

try these folks for a replacement carb parts.

http://www.carbparts.com/

http://www.sudco.com/

  • WB450

Posted August 23, 2007 - 07:13 AM

#3

Yep I feel your pain...seen it done it. :banghead:
You have to find a high quality penetrating oil to soak it in. Or break apart the cable and drill it out.

After this - I found that a 15.00 Alum. hotstart nut from procircuit or Zipty along witha dab of grease will keep this from ever happening again....but most owners do not get it and choose to keep the oem plastic nut that leaks water right in and causes this:thumbsdn:

try these folks for a replacement carb parts.

http://www.carbparts.com/

http://www.sudco.com/



I can't remember, do you need to pull the carb to replace the nut?

  • DPW

Posted August 23, 2007 - 07:31 AM

#4

happened to my '02 YZ426 with a Dr.D hot-start took the carb to a local MX performance shop and they removed the stuck piece for $20....

  • grayracer513

Posted August 23, 2007 - 07:40 AM

#5

No, you don't.

The final way to remove the plunger safely when nothing else works is to drill a hole down the length of it as near the center as possible. Thread this hole as deeply as you can without a drill or tap touching the throttle body. Then take a long bolt the same thread size, run a nut onto it, slide a washer over that, and screw it into the plunger as deeply as you can. Now run the nut down against the washer, which should sit squarely on top of the hot start bore, and keep tightening it. It should act as a puller to extract the plunger.

  • shortburb

Posted August 23, 2007 - 08:05 AM

#6

i was going to drill a hole in it and just use an EZ out but since breaking the body its just going to get JB welded in the closed position....

what really ticks me off is the fact that a company as robust as yamaha didnt or doesnt take the time to notice things like this....my bike is an 03 and yea its 4 years old but internal carb components shouldnt be oxidizing for years to come....

  • JSanfilippo

Posted August 23, 2007 - 08:35 AM

#7

what really ticks me off is the fact that a company as robust as yamaha didnt or doesnt take the time to notice things like this....my bike is an 03 and yea its 4 years old but internal carb components shouldnt be oxidizing for years to come....


To my knowledge all the motorcycle MFGs that use a remote hot start lever have this plastic nut for the hot start plunger. If anything, this is all on Keihin

  • Ga426owner

Posted August 23, 2007 - 11:08 AM

#8

I agree it is so stupid that a quality part is not used there....the darn thing will strip threads easy...I replace this as well as chain on all new bikes immediately:thumbsup:

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  • WB450

Posted August 23, 2007 - 11:32 AM

#9

Yep I feel your pain...seen it done it. :banghead:
You have to find a high quality penetrating oil to soak it in. Or break apart the cable and drill it out.

After this - I found that a 15.00 Alum. hotstart nut from procircuit or Zipty along witha dab of grease will keep this from ever happening again....but most owners do not get it and choose to keep the oem plastic nut that leaks water right in and causes this:thumbsdn:

try these folks for a replacement carb parts.

http://www.carbparts.com/

http://www.sudco.com/



I'm having trouble finding that, any suggestions?

  • grayracer513

Posted August 23, 2007 - 12:10 PM

#10

Really?

Here:

http://www.ziptyracing.com/

Click Products and see if you can get there. I'll send you a direct link if you still can't get to it.

  • WB450

Posted August 23, 2007 - 12:21 PM

#11

Really?

Here:

http://www.ziptyracing.com/

Click Products and see if you can get there. I'll send you a direct link if you still can't get to it.




This is the only one they show, is it the right one for a 07?


Ty's Hot Start Carb Nut fits the 03-04 YZ/WR 250F/450F, as well as the CRFs, KX-Fs, RM-Zs, and KTM 'RFS' ...

  • grayracer513

Posted August 23, 2007 - 12:51 PM

#12

This is the only one they show, is it the right one for a 07?


Ty's Hot Start Carb Nut fits the 03-04 YZ/WR 250F/450F, as well as the CRFs, KX-Fs, RM-Zs, and KTM 'RFS' ...

What is? (no link) But the only one they show is the right one, yes.

  • WB450

Posted August 23, 2007 - 03:38 PM

#13

What is? (no link) But the only one they show is the right one, yes.




Sorry, that was stupid.

http://www.ziptyraci...spx?id=MTA3OA==

  • grayracer513

Posted August 23, 2007 - 03:45 PM

#14

Yup, that's it. As far as I know, they're the same.

  • WB450

Posted August 23, 2007 - 04:16 PM

#15

Yup, that's it. As far as I know, they're the same.



Thanks!:applause:

  • shortburb

Posted August 26, 2007 - 07:02 PM

#16

...i need to add my results....i have come to the conclusion that the hot start was siezed open (slightly). after making sure the plunger was seated (i popped the little freeze(wrong terminology) plug out to view it) i JB welded it down. today i took the bike out.

EVERY SINGLE BIT OF DECEL POPPING IS GONE. ok i lied, if im 4th gear pinned and roll off the throttle all the way down it might fluff out a small pooffff. no more machine gun on decel. much happier. :applause: when the carb was out i DID NOT change jetting or even make adjustments to the fuel screw. it still occasionally take 5-6 kicks when hot to start (same as it was)





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