2018 TX300 questions
Re: 2018 TX300 questions
Here's my latest jetting:
440
42-75 clip 2
S4
32.5 pj
5.75 slide with reed side filed with a chainsaw file
Works really well!
440
42-75 clip 2
S4
32.5 pj
5.75 slide with reed side filed with a chainsaw file
Works really well!
'18 300 XC
'02 XR650R
'02 XR650R
Re: 2018 TX300 questions
For any of you who may have torn the top o-ring like I seem to have from jetting in the bush, here's the part number:
2001-2006 Suzuki RM125 part - 13258-36F00
1999-2015 Yamaha YZ125 part - 5ET-14147-00
2001-2006 Suzuki RM125 part - 13258-36F00
1999-2015 Yamaha YZ125 part - 5ET-14147-00
'18 300 XC
'02 XR650R
'02 XR650R
Re: 2018 TX300 questions
Curious is the L needle a Suzuki NECL needle? Got the bike running decent but it could still be a little bit better.Dobi wrote:I have run JD kits in the past with good luck, especially when running an SX head
162 main and a 38 pilot. L needle in the 2nd from top position (I can never remember how to label them)
I have gone as low as 158. but it hurts the top end run out at lower elevation and heavy loads.
- Dobi
- 2024 RMDRA Member
- Posts: 3770
- Joined: Thu Mar 03, 2005 9:33 pm
- Location: deep in the woods on some epic singletrack
- Contact:
Re: 2018 TX300 questions
I believe it is... I have a pile of jets and needles from years pastBigD wrote:Curious is the L needle a Suzuki NECL needle? Got the bike running decent but it could still be a little bit better.Dobi wrote:I have run JD kits in the past with good luck, especially when running an SX head
162 main and a 38 pilot. L needle in the 2nd from top position (I can never remember how to label them)
I have gone as low as 158. but it hurts the top end run out at lower elevation and heavy loads.
I did drop down to a 160 main and changed my needle again recently for better gains (can't recall what I stuck in, I was eyeballing them in the parking lot at Panorama before the race). The bike is now running great. I did buy a JD kit for the set up I am running but have yet to drop their needle in. Perhaps I will do so before heading to Vega to race this weekend. I do like to fatten it up for the sand drag races on Saturday night
Re: 2018 TX300 questions
Ok thanks! I’ll keep testing I am starting to get a collection of needles also.Dobi wrote:I believe it is... I have a pile of jets and needles from years pastBigD wrote:Curious is the L needle a Suzuki NECL needle? Got the bike running decent but it could still be a little bit better.Dobi wrote:I have run JD kits in the past with good luck, especially when running an SX head
162 main and a 38 pilot. L needle in the 2nd from top position (I can never remember how to label them)
I have gone as low as 158. but it hurts the top end run out at lower elevation and heavy loads.
I did drop down to a 160 main and changed my needle again recently for better gains (can't recall what I stuck in, I was eyeballing them in the parking lot at Panorama before the race). The bike is now running great. I did buy a JD kit for the set up I am running but have yet to drop their needle in. Perhaps I will do so before heading to Vega to race this weekend. I do like to fatten it up for the sand drag races on Saturday night
- Dobi
- 2024 RMDRA Member
- Posts: 3770
- Joined: Thu Mar 03, 2005 9:33 pm
- Location: deep in the woods on some epic singletrack
- Contact:
Re: 2018 TX300 questions
I had to pull my carb apart last night to confirm my needle setting for another gentleman and thought I would document it here for when I forget... My current setting is below. This thing is jetted great. Pulls ski hills like mad and is clean off the bottom. i run Opti oil at 80:1 and recently ran a jug of Liquid Moly through at 50:1 with no difference in jettingBigD wrote:Ok thanks! I’ll keep testing I am starting to get a collection of needles also.Dobi wrote:I believe it is... I have a pile of jets and needles from years pastBigD wrote:
Curious is the L needle a Suzuki NECL needle? Got the bike running decent but it could still be a little bit better.
I did drop down to a 160 main and changed my needle again recently for better gains (can't recall what I stuck in, I was eyeballing them in the parking lot at Panorama before the race). The bike is now running great. I did buy a JD kit for the set up I am running but have yet to drop their needle in. Perhaps I will do so before heading to Vega to race this weekend. I do like to fatten it up for the sand drag races on Saturday night
PJ - 38
MJ - 162
Needle - N2Zk (from an 09 300XC) part number 54731134800
-
- 2024 RMDRA Member
- Posts: 78
- Joined: Fri Oct 14, 2005 8:32 pm
Re: 2018 TX300 questions
So the 2016 keihin bolted right in? Neither rubber boots needed to be upgraded? I would love to do this upgrade and just want to confirm on parts.Dobi wrote:
I had to pull my carb apart last night to confirm my needle setting for another gentleman and thought I would document it here for when I forget... My current setting is below. This thing is jetted great. Pulls ski hills like mad and is clean off the bottom. i run Opti oil at 80:1 and recently ran a jug of Liquid Moly through at 50:1 with no difference in jetting
PJ - 38
MJ - 162
Needle - N2Zk (from an 09 300XC) part number 54731134800
Re: 2018 TX300 questions
There have been fixes discovered to make the Mikuni just as good as the Keihin. I wouldn't waste your money if you intend to buy a new carb. Filing the slide and installing a jet block gasket kit form Cometic/JD Jetting seem to cure all the issues. There's also a few other mods Graham Jarvis' mechanic has done which seems to also improve things.
You can fix the carb for about $15 for the gasket, and everything else it DIY mods.
Mine runs great, and I have another friend who has the same jetting as me who says it is just as good as his old Keihin 300's.
You can fix the carb for about $15 for the gasket, and everything else it DIY mods.
Mine runs great, and I have another friend who has the same jetting as me who says it is just as good as his old Keihin 300's.
Re: 2018 TX300 questions
I tried the "fixes " for the stock mikuni carb after running a 36mm keihin with a jd kit. The mikuni was ok but the mid range had a rough spot I couldn't get rid of. Elevation 3,000 to 5,000 feet for the winter. But will go up to 9,000+ feet in the summer. the keihin was hands down better and very simple to jet. I did the usual 4 force reeds and milled the head down .015. I left the airbox alone.
I grew up on 2 strokes switched to 4 strokes in 01 then rode a 2017 tx 300 and switched back to 2 strokes. I've also switched from primarily riding mx to more of a 50/50 split between mx and trail riding the tx 300 does it all! I even like the air forks
I grew up on 2 strokes switched to 4 strokes in 01 then rode a 2017 tx 300 and switched back to 2 strokes. I've also switched from primarily riding mx to more of a 50/50 split between mx and trail riding the tx 300 does it all! I even like the air forks
Re: 2018 TX300 questions
When you say "tried the fixes for the Mikuni carb" that included the JD Jet block gasket kit, Jarvis mods and filed the notch in the slide bigger ?218Norton wrote:I tried the "fixes " for the stock mikuni carb after running a 36mm keihin with a jd kit. The mikuni was ok but the mid range had a rough spot I couldn't get rid of. Elevation 3,000 to 5,000 feet for the winter. But will go up to 9,000+ feet in the summer. the keihin was hands down better and very simple to jet. I did the usual 4 force reeds and milled the head down .015. I left the airbox alone.
I grew up on 2 strokes switched to 4 strokes in 01 then rode a 2017 tx 300 and switched back to 2 strokes. I've also switched from primarily riding mx to more of a 50/50 split between mx and trail riding the tx 300 does it all! I even like the air forks
Re: 2018 TX300 questions
"Trail guy. No I didn't do the JD jet block gasket kit but I did the Jarvis mods and filed the slide
Re: 2018 TX300 questions
I rode yesterday at Wild Rose with all the mods, bike ran great with the Mikuni. I know woods riding is a bit different, but I think all of those mods were another step forward from already dialed in jetting.