GasGas Riders Club Forum  

Go Back   GasGas Riders Club Forum > GasGas Enduro Technical Forums > Enduro Intake/Carburetion - 2 stroke

Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc.


Reply
 
Thread Tools Display Modes
  #1  
Old 07-18-2014, 03:27 AM
FDB's Avatar
FDB FDB is offline
Senior Member
 
Join Date: Jun 2014
Posts: 119
Unhappy Strange issue. Need advice.

Hi guys.
I have a strange question.
I bought a 2002 300 Gasser and started refurbishing it.
The previous owner managed to fit a YZ250 exhaust header and silencer on it, but everything else motor wise is stock.

Checked reeds, did the jets to spec, the works.
Started the bike, and rode it, and it has a terrible crackling at 1/4 to half throttle. No matter what I do, it stays there. Raised the needle clip, messed with the airscrew, checked the choke, set the float level to spec, everything.
Everything pointed to a rich pilot circuit.

So I thought that by dumb luck, let me put a slide needle I have lying around from a 2006 KDX200 and the bike is absolutely perfect.
The needle that came with the bike is a N1ED. Not sure what the code is for the KDX needle but it definitely less taper (thicker).
So I have a rich condition that the thicker needle is sorting out for me.
Question is.. Why?
I checked the choke. Everything is fine there.

A few things bother me on the bike that I will get to soonest:
1. It does not have the OEM rubber that connects the carb to the reedvalves. It is just a random rubber pipe. And the carb is about 2mm from the reed fitting and not perfectly aligned to the reed fitting pipe.
2. It has a YZ250 pipe on.
3. The powervalves was set to fully open, and fully closed manually to check that that was not maybe the cause. Same rich condition on both those settings.
4. I?m not sure where the spark timing should be on the 2002 300 Gasser. But surely that could not have the same symptoms as a rich condition, and a fatter needle won?t make that better.
5. The bike is probably due for a new set of rings. But it has a ton of compression still and goes like crazy with the KDX needle.

I?m stumped.
I can leave the KDX needle in there and all will be ok, but surely something is not right and the KDX needle is a plaster on a cut. I want to fix the cut.

Any ideas?


Reply With Quote


  #2  
Old 07-18-2014, 12:21 PM
lgr's Avatar
lgr lgr is offline
Member
 
Join Date: Jul 2013
Posts: 87
Default

What do you mean when you say the power valve is "set to fully open"? Is it open all the time?
Reply With Quote
  #3  
Old 07-18-2014, 12:46 PM
Fred1956's Avatar
Fred1956 Fred1956 is offline
Senior Member
 
Join Date: Oct 2009
Location: NW Arkansas
Posts: 1,254
Default

Quote:
Originally Posted by FDB View Post
Hi guys.
I have a strange question.
I bought a 2002 300 Gasser and started refurbishing it.
The previous owner managed to fit a YZ250 exhaust header and silencer on it, but everything else motor wise is stock.

Checked reeds, did the jets to spec, the works.
Started the bike, and rode it, and it has a terrible crackling at 1/4 to half throttle. No matter what I do, it stays there. Raised the needle clip, messed with the airscrew, checked the choke, set the float level to spec, everything.
Everything pointed to a rich pilot circuit.

So I thought that by dumb luck, let me put a slide needle I have lying around from a 2006 KDX200 and the bike is absolutely perfect.
The needle that came with the bike is a N1ED. Not sure what the code is for the KDX needle but it definitely less taper (thicker).
So I have a rich condition that the thicker needle is sorting out for me.
Question is.. Why?
I checked the choke. Everything is fine there.

A few things bother me on the bike that I will get to soonest:
1. It does not have the OEM rubber that connects the carb to the reedvalves. It is just a random rubber pipe. And the carb is about 2mm from the reed fitting and not perfectly aligned to the reed fitting pipe.
2. It has a YZ250 pipe on.
3. The powervalves was set to fully open, and fully closed manually to check that that was not maybe the cause. Same rich condition on both those settings.
4. I?m not sure where the spark timing should be on the 2002 300 Gasser. But surely that could not have the same symptoms as a rich condition, and a fatter needle won?t make that better.
5. The bike is probably due for a new set of rings. But it has a ton of compression still and goes like crazy with the KDX needle.

I?m stumped.
I can leave the KDX needle in there and all will be ok, but surely something is not right and the KDX needle is a plaster on a cut. I want to fix the cut.

Any ideas?
What main jet is in there? I believe the N1ED is stock...If it works ggod then I'd leave the KDX needle in there & enjoy it....I run a Suzuki needle myself, some guys run Yamaha needles as well. + what does "plaster on a cut" mean (I'm not from around here )
__________________
Fred Overstreet
2010 EC250 SixDays
2004 GasGas EC300 -Sold to a good home
2006 GasGas EC250-Sold to a good home
2006 GasGas TXT 280 Pro
Reply With Quote
  #4  
Old 07-18-2014, 08:55 PM
rosco's Avatar
rosco rosco is offline
Site Sponsor
 
Join Date: Nov 2010
Location: Rapid City, S.D.
Posts: 311
Default

If it runs good with the kdx needle I would stick with that. I havn't ever been able to make the n1ed needle work.
__________________
Rosco's Motorcycle and ATV
Rapid City, South Dakota
www.roscosmotorcycle.com


Reply With Quote
  #5  
Old 07-20-2014, 03:56 PM
FDB's Avatar
FDB FDB is offline
Senior Member
 
Join Date: Jun 2014
Posts: 119
Default

Quote:
Originally Posted by lgr View Post
What do you mean when you say the power valve is "set to fully open"? Is it open all the time?
It was yes.
Reply With Quote
  #6  
Old 07-20-2014, 03:57 PM
FDB's Avatar
FDB FDB is offline
Senior Member
 
Join Date: Jun 2014
Posts: 119
Default

Quote:
Originally Posted by Fred1956 View Post
What main jet is in there? I believe the N1ED is stock...If it works ggod then I'd leave the KDX needle in there & enjoy it....I run a Suzuki needle myself, some guys run Yamaha needles as well. + what does "plaster on a cut" mean (I'm not from around here )
Lol.
I mean it is a fix to a symptom. Not a solution to the underlying problem.
Reply With Quote
  #7  
Old 07-20-2014, 04:04 PM
FDB's Avatar
FDB FDB is offline
Senior Member
 
Join Date: Jun 2014
Posts: 119
Default

Quote:
Originally Posted by rosco View Post
If it runs good with the kdx needle I would stick with that. I havn't ever been able to make the n1ed needle work.
Cool.
I pulled the sleeve (barrel) to have a look at the condition of the piston, sleeve and rings.
The previous owner had no bottom gasket in there. None.
I put one in and made sure everyghing was fine. I did not change anything on the carb at all.

Took the bike for a quick spin today.
Pulls smooth but now has a slight bog from idle. I can feel it is now lean on the pilot circuit and needle.
This is good news.

Will see if it now pulls right with the oem needle (which is thinner than the kdx one) later this week.

Makes me wonder...
Why would no bottom gasket on a bike require a lean pilot/needle??
Squish?
Valve timing?
Reply With Quote
Reply



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange spots on piston nokturnal Enduro Engine - 2 stroke 9 11-18-2013 12:57 AM
advice on slow starting and clutch issue Orujo Enduro Engine - 2 stroke 0 04-23-2013 07:08 PM
12 300 running strange shark4465 Enduro Engine - 2 stroke 21 01-05-2013 09:20 PM
Rather strange problem on the 11 300 six days bukwheat General Discussions & Announcements 7 04-15-2011 04:08 PM
No wonder my forks felt strange JCW Enduro Suspension 2 12-01-2007 05:45 PM




All times are GMT -5. The time now is 05:24 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright 2009 - GasGasRider.org