ADVrider

Go Back   ADVrider > Bikes > Thumpers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 07-12-2013, 08:55 AM   #3421
Erock65
Erock65
 
Joined: May 2013
Location: Humboldt
Oddometer: 12
Quote:
Originally Posted by backroadbob.com View Post
Hey, Erock65, did you ever get your charging system sorted?
No I did not just been trickle charging it every few days
Erock65 is offline   Reply With Quote
Old 07-15-2013, 05:49 AM   #3422
danny1987hunting
n00b
 
Joined: Jul 2013
Location: West Farmtown, o hi yo
Oddometer: 4
Thumb

I've been working on my 91 XT 350 for 3 years now, I've finally gotten it next to mint operating condition, witch it ran great when I got it with 2000 miles, has 9500 now. Anyways I've got definite answers for Jets that go in the secondary carburetor, jets for the primary and a definite bolt on and go 520 chain conversion with all top notch steel sprockets, I've rode 3500 miles on my 520 chain and the chain is tight & still on its 3rd tightening, I ride it everyday for about 6 or 7 months a year, its my primary wheels. I also just bought a handful of swap in parts for the secondary main jets, and I have a couple 128 and 130 main jets for the primary carb, so far I've put a 130 in the main carb with a new dg pipe and stock air box n filter, also when I cleaned my stock pilot jet it ran perfect with the fuel screw set at 2 turns out. I have 120 jets for the secondary main carb, I'm gonna throw one of them in there as I feel this bike will still take more fuel. Anyways lets revive yamaha XT 350 performance forums and tech swapping ideas, Like I said I have jets for both carbs and Jt sprockets steel 520 sprockets and 520 chains that bolt right on don't even have to take a link out of the chain. I'm running 15/40 sprockets which is 2.66 gearing and it pulls really well through top end, harder n faster than it pulled with stock gearing because the chain is stronger and with really good jetting, i'm at 800 ft altitude. The chain I use is 8500 pound tensile strength vs oem chain that is 4000 lb tensile strength, you do the match on that. When you notice that 428 chains are what they use on go carts and yz 80's you know something is wrong with that on the xzt 350. Stock gearing is 2.89. Now if I hold it I can get 30 mph in first gear and its faster all around because the motor is really strong the gearing was just too short from factory. It runs about 4300 rpm at 55 mph and is a real nice street cruiser now, also the clean pilot and bigger main jet has drastically cooled the bike. I rode today 10 miles and its 90 degrees here. normally that thing is too freakin hot, it felt so much better, big time, it felt like a normal atv or bike, warm but not so damn hot you know its about overheated. Also with more fuel through the jets it hands down accelerates faster to top speed of about 80 mph than it did with stock gearing, stock gears you gotta shift too much, and believe you me it feels like a faster bike with longer gears because it pulls them just as hard except instead of shifiting 4 or 5 times to 50 mph you may only shift 3 times. 3500 rpm at 35 mph in 5th gear, 3100 or 3000rpm at 35 mph in 6th gear. I've got the parts and have been selling them at really good price just to get the "good" parts into the hands of the guys who need them. Hit me up, I'm Dan email me- lanaalumpy@yahoo.com, also see my ebay listing!!! thumpertalk members mention thumpertalk you'll get a discount just cuz I know you're around the threads and could maybe help me with something one day. Last but definitely foremost!! Praise the Lord, through Him, all things are possible, and I am truly blessed by the Lord Himself
danny1987hunting is offline   Reply With Quote
Old 07-17-2013, 06:52 AM   #3423
gearheadE30
Studly Adventurer
 
gearheadE30's Avatar
 
Joined: Jan 2012
Location: Indiana
Oddometer: 700
The reason the XT is geared short is so that you can use it as a trail bike. Stock final drive ratio is something 2.89:1 iirc, and I've taken mine down to 2.81:1 when I did the conversion just to keep it around 6k revs on the highway. typical rule of thumb is you want to stay below 80% of max rpm if it's for long periods of time, so that puts me about right. If anything, it's a little too long for technical trail riding.
__________________
1986 Yamaha XT350
2005.5 KTM 950 Adventure
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950
gearheadE30 is offline   Reply With Quote
Old 07-20-2013, 02:37 PM   #3424
NordieBoy
Armature speller
 
NordieBoy's Avatar
 
Joined: Dec 2006
Location: Kiwiland
Oddometer: 7,082
15/40? On 520?
__________________
DR650 Wiki
NordieBoy is online now   Reply With Quote
Old 07-21-2013, 07:54 AM   #3425
gearheadE30
Studly Adventurer
 
gearheadE30's Avatar
 
Joined: Jan 2012
Location: Indiana
Oddometer: 700
I'm running 16/45. 16 is the biggest sprocket you can run safely without the chain hitting the engine case.
__________________
1986 Yamaha XT350
2005.5 KTM 950 Adventure
1991 BMW 318is turbo track car
1989 Chevrolet Caprice Classic Wagon sleeper tow car
3 Months Exploring the US on a 950
gearheadE30 is offline   Reply With Quote
Old 07-23-2013, 07:01 AM   #3426
danny1987hunting
n00b
 
Joined: Jul 2013
Location: West Farmtown, o hi yo
Oddometer: 4
520 chains

Yes sir, A 15/40, its darn close to the case on the countershaft but it slides freely. I had a 14 tooth on front til recently bumped it up for easier cruising on state routes. I really like it for what I do, if I rode alot offroad I'd go back to the 14tooth, but this combo really makes 1st 2nd & 3rd useable on the street. I can putt at about 3 or 4 mph in first still but also 15 - 20 mph isn't out the question in 1st if need be. Its stable for trails at around 7 mph without having to feather around the clutch to keep in power.
danny1987hunting is offline   Reply With Quote
Old 07-23-2013, 10:03 AM   #3427
JensEskildsen
Studly Adventurer
 
Joined: Mar 2009
Location: Denmark
Oddometer: 954
Im at 16/45 (520 size) for dualsport use.

Have had it down to 15 front for singletrack use, which works fine.
__________________
2003 xt600e 150.000km
1986 xt350 99.200km

JensEskildsen screwed with this post 07-27-2013 at 11:35 AM
JensEskildsen is online now   Reply With Quote
Old 07-25-2013, 02:33 AM   #3428
NordieBoy
Armature speller
 
NordieBoy's Avatar
 
Joined: Dec 2006
Location: Kiwiland
Oddometer: 7,082
I use 14-15-16/50 sprockets depending on the situation.
__________________
DR650 Wiki
NordieBoy is online now   Reply With Quote
Old 07-29-2013, 02:58 AM   #3429
Lenz1
Gnarly Adventurer
 
Joined: Jul 2010
Location: Queensland Australia
Oddometer: 141
Gearing at 16:45 is kinda high for a 350.

I'm running higher compression (20thou off the head), major re-ported and gas flowed cyl head, re-aligned inlet tract, Australian UNI filter oiled foam air filters. The short summary of this engine is that it is now running very close to the performance of a carbie-fuelled 450 Yamaha.

A good balance of acceleration and top end on the road with this high output engine is available with 15:50. Any higher gearing is making the engine lug / pull too hard at lower revs.

Std gearing is 14:50 and it's a fun engine at this gearing. Go to 14:52 and it's perfect for the dirt.

Running 16:45 so you can hit a max top speed would in my experience seriously compromise the performance of a std engine - it's a 350cc not a 500 / 650
Lenz1 is offline   Reply With Quote
Old 07-30-2013, 01:51 PM   #3430
JensEskildsen
Studly Adventurer
 
Joined: Mar 2009
Location: Denmark
Oddometer: 954
I think I'll have a real hard time disgussing things with you, if you really think more compression and a flowed head makes a 30hp xt350 go like a 45-50hp 450

16/45is with 520 kit, just so we all agree.

The xt350 has 19/52 428 size stock (which is right in between 15-16/45 on 520)

With 15/45 i can go into 6th gear at around 60km/h.

This is with 15/45:

http://www.youtube.com/watch?v=5MEfFjXieX4

You can hear it "ring out" the gears okay-ish fast at 1:30 (ang again at 6:10) after that, a downgear and drive over car, and other lowspeed stuff.

Very versatile, so cant se why going up +1 on Cs sprocket should be bad for more open stuff, and more "normal" dualsport use.

Im not the fastest one out there, but thats not the bikes fault
__________________
2003 xt600e 150.000km
1986 xt350 99.200km

JensEskildsen screwed with this post 07-30-2013 at 01:59 PM
JensEskildsen is online now   Reply With Quote
Old 07-30-2013, 08:07 PM   #3431
CB85
n00b
 
Joined: Jul 2013
Location: Melbourne, Australia
Oddometer: 1
Talking

Hi everyone, i've been reading the thread for the last few days and decided to join up. I own a 94 xt350 and commute on it daily. I was wondering if anyone had any ideas for a brake upgrade?

I found that there is a 320mm rotor upgrade for a TW200 available, and that the TW has the same bolt centre spacing for the rotor and for the brake caliper. Has anyone tried the TW200 or XT225 front caliper, (they're very similar and twin piston) on their XT as it looks like it should fit.

Living in Australia makes it hard (and expensive) to try some of these things as we never got the TW and only recently got the XT225 (XT250 over here).
Cheers.
CB85 is offline   Reply With Quote
Old 07-31-2013, 04:14 AM   #3432
Lenz1
Gnarly Adventurer
 
Joined: Jul 2010
Location: Queensland Australia
Oddometer: 141
Quote:
Originally Posted by JensEskildsen View Post
I think I'll have a real hard time disgussing things with you, if you really think more compression and a flowed head makes a 30hp xt350 go like a 45-50hp 450

16/45is with 520 kit, just so we all agree.

The xt350 has 19/52 428 size stock (which is right in between 15-16/45 on 520)

With 15/45 i can go into 6th gear at around 60km/h.

This is with 15/45:

http://www.youtube.com/watch?v=5MEfFjXieX4

You can hear it "ring out" the gears okay-ish fast at 1:30 (ang again at 6:10) after that, a downgear and drive over car, and other lowspeed stuff.

Very versatile, so cant se why going up +1 on Cs sprocket should be bad for more open stuff, and more "normal" dualsport use.

Im not the fastest one out there, but thats not the bikes fault
I'm afraid we are going to have to agree to disagree on your gearing approach. Unless you've got access to a magic wand I can't see how your claims match a standard engine's output.

As to the output of the engine I've massaged, I've ridden both this bike and the latest carb'd 450 Yamaha (before fuel injection) and this TT350 (not XT350) is only slightly down on the carb'd 450.

I'm not interested in a debate on this issue - I'm 57 years old and capable of revising and upgrading most 4 stroke engines for significant performance gains.

Your bike - your choices - care factor NIL

Lenz1 screwed with this post 07-31-2013 at 04:35 AM
Lenz1 is offline   Reply With Quote
Old 07-31-2013, 04:39 AM   #3433
xt4ever
Adventurer
 
xt4ever's Avatar
 
Joined: Jan 2010
Location: Z, Spain
Oddometer: 80
I have an european '91 XT350 with a 520 chain kit. I'm using 14-40 for off-road use and 15-40 for road use.

I would like to add as well that in the OEM 428 chain size european models come with 19-52, but the U.S. models come with 19-55
xt4ever is offline   Reply With Quote
Old 07-31-2013, 04:42 AM   #3434
JensEskildsen
Studly Adventurer
 
Joined: Mar 2009
Location: Denmark
Oddometer: 954
Im pretty sure the TT350 is geared differently internally, so thats probably why we have so different experiences. The xt350 is well known to have low gearing from the factory, it hits redline with stock gearing, not many bikes do that in top gear.

Quote:
Originally Posted by Lenz1 View Post
I'm afraid we are going to have to agree to disagree on your gearing approach.

I'm not interested in a debate on this issue
Seems fair, I can only agree
__________________
2003 xt600e 150.000km
1986 xt350 99.200km
JensEskildsen is online now   Reply With Quote
Old 07-31-2013, 08:57 AM   #3435
JensEskildsen
Studly Adventurer
 
Joined: Mar 2009
Location: Denmark
Oddometer: 954
Agh shout, couldn't help myself.

Little climbing with 16/45 gearing. Fun stuff after 1:20

__________________
2003 xt600e 150.000km
1986 xt350 99.200km
JensEskildsen is online now   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
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 On

Forum Jump


Times are GMT -7.   It's 11:46 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014