Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > Honda Tech
98 RX650L main Jet size? 98 RX650L main Jet size?
Register FAQ Calendar Today's Posts
Honda Tech Honda Tech Forum - For Questions specific and of interest to Honda riders only.
Photo by Hendi Kaf, in Cambodia

I haven't been everywhere...
but it's on my list!


Photo by Hendi Kaf,
in Cambodia



Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 13 Jun 2005
BDF BDF is offline
Registered Users
New on the HUBB
  
Join Date: Jun 2005
Location: Edmonton, Alberta, Canada
Posts: 11
98 RX650L main Jet size?
Can anyone tell me the factory main jet size? I have a miss / backfire. Currently it has a 160 in it, but the plug is a bit white on the tip indicating lean. Air pilot screw seems to be happy around 3 turns, that is about 1/2 a turn farther an any other of my bikes.
Through my scope on the CDI and it looks good, stable, constant.
Any other thoughts or suggestions would be great!
Thanks.
Reply With Quote
  #2  
Old 13 Jun 2005
Registered Users
Veteran HUBBer
  
Join Date: May 2002
Location: London, UK
Posts: 635
you previously said this misfire was off idle - main jet only really affects 3/4 to full throttle so, while 160-165 would be right for many exhausts, that's unlikely to be the problem. is it misfiring under load or when revving it at the side of the road? is it when opening or closing the throttle.

the number of turns on the airscrew is only indicative. are you clear on how to set it properly? thoroughly warm the engine and then, with it still running, wind the screw in until the revs fall, then wind it out as the revs rise and then fall again. the right setting is halfway between the positions at which revs fall when winding in and out. if this is 3 turns, fine. remember to set the idle speed once the mixture is set rather than to use idle speed to compensate for bad mixture.

despite all that, I'm not clear that it'll help you much because I'm not really clear what the symptoms are. one XR400 I had came with a high float so the fuel level was high. this caused an intermittent hiccough under load which pointed to a large main jet, but was actually resolvced by adjusting the float height

good luck and try describing the symptoms more fully
Reply With Quote
  #3  
Old 13 Jun 2005
BDF BDF is offline
Registered Users
New on the HUBB
  
Join Date: Jun 2005
Location: Edmonton, Alberta, Canada
Posts: 11
Thanks Rich,
Yes I have dialed the air idel all the way out, till the revs drop, and back in till they drop. 3 was in the middle. The issue had been at idel as well, the air idel was at 2.5 when I bought it, (cranked it in and counted before removing) by correctly setting the air idel, the miss has cleared up at idel. I will PU a 165 Main and see what that does through my mids. How do you adjust the float level in these, it seemes to be set in plastic?
The miss seems to be in the mids, not even really under load. When I crack it while at mid RPM it seems to accelerate fine. Any further thoughs or suggestions would be great!
Thanks.


[This message has been edited by BDF (edited 13 June 2005).]

[This message has been edited by BDF (edited 13 June 2005).]
Reply With Quote
  #4  
Old 14 Jun 2005
Registered Users
Veteran HUBBer
  
Join Date: May 2002
Location: London, UK
Posts: 635
well, it sounds like you've been doing all the right things with the carb.

to adjust the float level, you can usually bend the tag that pushes on the valve seat, but I'm not clear that's going to be the issue.
Reply With Quote
  #5  
Old 14 Jun 2005
BDF BDF is offline
Registered Users
New on the HUBB
  
Join Date: Jun 2005
Location: Edmonton, Alberta, Canada
Posts: 11
I am going to try a bit richer on the main & the pilot, also check the valves. What does the diaphragm on the side of the carb do? It appears to be some sort of a switch, one end of it connects down to the oil pump, and the other "Y" goes to in front of the butterfly. What does this control / accomplish? Also if you happened to know the valve clearances that would be great.
I have had many bikes, but this is my first true thumper, Currently also have an 85DR200, but I get up into the foothills and 7000 feet, and the little DR doesn't have much left up there. I had a 92 ZX11 but was doing more and more riding on the DR, so I got a straight across trade for the 98 XR650L but with the miss. The carb had some residue in it, but the problem is still there, the air idle cleaned up the miss on low end, so I figured richen up the main & pilot, see what happens, for the cost of a couple of jets. The bike "appears" to be in good shape, but after close examination, a few heli coils here and there, some one had welded on the frame, making me question the CDI (Quickest way to nuke a Ho2 sensor on a car), but I scoped that and it looks good.
Reply With Quote
  #6  
Old 14 Jun 2005
BCK_973's Avatar
Registered Users
Veteran HUBBer
  
Join Date: Mar 2005
Location: Buenos Aires,City of good sex,mate and asado!
Posts: 539
From factory it came with a 152 jet.
KH
__________________
http://vientoderipio.blogspot.com/
America is a nice continent,not a country.All people who lives in this continent are americans.Discover it in peace!
Reply With Quote
  #7  
Old 14 Jun 2005
BDF BDF is offline
Registered Users
New on the HUBB
  
Join Date: Jun 2005
Location: Edmonton, Alberta, Canada
Posts: 11
Thanks BCK_973, so I guess a 160 is already a bit richer. My intake valves have 0 clerance, that is probably and issue as well, and certainly needs to be addressed.

Reply With Quote
Reply

« Previous Thread | Next Thread »

Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 

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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
 

Announcements

Thinking about traveling? Not sure about the whole thing? Watch the HU Achievable Dream Video Trailers and then get ALL the information you need to get inspired and learn how to travel anywhere in the world!

Have YOU ever wondered who has ridden around the world? We did too - and now here's the list of Circumnavigators!
Check it out now, and add your information if we didn't find you.

Next HU Eventscalendar

25 years of HU Events
Be sure to join us for this huge milestone!

ALL Dates subject to change.

2025 Confirmed Events:

Virginia: April 24-27 2025
Queensland is back! May 2-4 2025
Germany Summer: May 29-June 1 2025
CanWest: July 10-13 2025
Switzerland: Date TBC
Ecuador: Date TBC
Romania: Date TBC
Austria: Sept. 11-14
California: September 18-21
France: September 19-21 2025
Germany Autumn: Oct 30-Nov 2 2025

Add yourself to the Updates List for each event!

Questions about an event? Ask here

See all event details

 
World's most listened to Adventure Motorbike Show!
Check the RAW segments; Grant, your HU host is on every month!
Episodes below to listen to while you, err, pretend to do something or other...

Adventurous Bikers – We've got all your Hygiene & Protection needs SORTED! Powdered Hair & Body Wash, Moisturising Cream Insect Repellent, and Moisturising Cream Sunscreen SPF50. ESSENTIAL | CONVENIENT | FUNCTIONAL.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

2020 Edition of Chris Scott's Adventure Motorcycling Handbook.

"Ultimate global guide for red-blooded bikers planning overseas exploration. Covers choice & preparation of best bike, shipping overseas, baggage design, riding techniques, travel health, visas, documentation, safety and useful addresses." Recommended. (Grant)



Ripcord Rescue Travel Insurance.

Ripcord Rescue Travel Insurance™ combines into a single integrated program the best evacuation and rescue with the premier travel insurance coverages designed for adventurers.

Led by special operations veterans, Stanford Medicine affiliated physicians, paramedics and other travel experts, Ripcord is perfect for adventure seekers, climbers, skiers, sports enthusiasts, hunters, international travelers, humanitarian efforts, expeditions and more.

Ripcord travel protection is now available for ALL nationalities, and travel is covered on motorcycles of all sizes!


 

What others say about HU...

"This site is the BIBLE for international bike travelers." Greg, Australia

"Thank you! The web site, The travels, The insight, The inspiration, Everything, just thanks." Colin, UK

"My friend and I are planning a trip from Singapore to England... We found (the HU) site invaluable as an aid to planning and have based a lot of our purchases (bikes, riding gear, etc.) on what we have learned from this site." Phil, Australia

"I for one always had an adventurous spirit, but you and Susan lit the fire for my trip and I'll be forever grateful for what you two do to inspire others to just do it." Brent, USA

"Your website is a mecca of valuable information and the (video) series is informative, entertaining, and inspiring!" Jennifer, Canada

"Your worldwide organisation and events are the Go To places to for all serious touring and aspiring touring bikers." Trevor, South Africa

"This is the answer to all my questions." Haydn, Australia

"Keep going the excellent work you are doing for Horizons Unlimited - I love it!" Thomas, Germany

Lots more comments here!



Five books by Graham Field!

Diaries of a compulsive traveller
by Graham Field
Book, eBook, Audiobook

"A compelling, honest, inspiring and entertaining writing style with a built-in feel-good factor" Get them NOW from the authors' website and Amazon.com, Amazon.ca, Amazon.co.uk.



Back Road Map Books and Backroad GPS Maps for all of Canada - a must have!

Your ad could be here, on EVERY page of the HUBB, or the whole website, or as many as you like!

New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80G/S.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events all over the world with the help of volunteers; we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.



All times are GMT +1. The time now is 02:51.

Contact Us - Horizons Unlimited Motorcycle Travellers Website - Archive - Privacy Statement - Top