ADVrider

Go Back   ADVrider > Bikes > Old's Cool > 2 smokers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-03-2012, 11:41 PM   #16
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
If you ride enduro/mx bike like a trials bike, its going to get very hot, in exactly the same way as if its used at WOT for long periods on the road.
Twin-shocker is offline   Reply With Quote
Old 09-04-2012, 05:38 AM   #17
peter650
Gnarly Adventurer
 
Joined: Oct 2009
Location: Sydney
Oddometer: 417
Quote:
Originally Posted by Twin-shocker View Post
If you ride enduro/mx bike like a trials bike, its going to get very hot, in exactly the same way as if its used at WOT for long periods on the road.
I am sure you are a top bloke, but your wrong.
peter650 is offline   Reply With Quote
Old 09-04-2012, 10:43 AM   #18
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
Quote:
Originally Posted by peter650 View Post
I am sure you are a top bloke, but your wrong.

If so then I wonder why MX-enduro bikes used WOT for long distances (beach racing is a good example), are jetted and set up to stop them seizing on the very long straights?
Twin-shocker is offline   Reply With Quote
Old 09-04-2012, 11:45 AM   #19
tHEtREV
Captain Awesome
 
tHEtREV's Avatar
 
Joined: Apr 2007
Location: Middle Park, Brisbane, Australia
Oddometer: 7,248
So just don't ride with the throttle wide open.

You're asking for trouble doing that with most bikes on the street anyway, from the law if not mechanical...
__________________
tEAM iDIOT.
"Far to the general now, and without great final hope of victory, he has nothing to lose. And it must above all have rabies. For the moment, it dominates this special."
Joan Barreda
tHEtREV is online now   Reply With Quote
Old 09-04-2012, 11:48 AM   #20
High Country Herb
Adventure Connoiseur
 
High Country Herb's Avatar
 
Joined: Apr 2011
Location: Western Sierras
Oddometer: 7,131
It has been a while since I spent much time on 2-strokes, but have seen them sieze from extended WOT use.

As a kid, we rode our 2-strokes to the next town all the time. We rode them as if we were switching gears the whole way. In other words, while riding in top gear, we would pull the clutch in and let off the throttle occasionally to give the piston a quick break. Fuel/oil mix was still drawn in through the carb, and this gave the motor lube while coasting (for about a half second). We did this about every 10 seconds, and avoided top speed runs (unless someone wanted to see our street license credentials).

2-stroke oils have come a long way since then, so there is probably less chance of siezure. Even if it happens, it isn't much work to swap the rings and/or piston.
High Country Herb is offline   Reply With Quote
Old 09-04-2012, 01:05 PM   #21
JWhitmore44
pistolero
 
JWhitmore44's Avatar
 
Joined: Aug 2006
Location: NW Kansas
Oddometer: 1,578
I used to run my old DT250 35 miles to the next town. Crused 55 to 60 mph, speed limit was 55. Air cooled, oil injection, never heard of varying the rpm, pulling in the clutch, or applying the choke. It's a wonder I didn't go up in flames Are you really running with the throttle wrapped clear around? Find a comfortable cruising speed and don't rap it out tight. Unless you are running lean on the top end of the throttle opening I can't see where you would get into too much trouble. Both bikes you are talking about are water cooled aren't they? Thought those bikes were "enduro" types were it could see a long stretch of high speed through desert like conditions.
__________________
84 Honda Goldwing (GL1200)
03 XR650L
JWhitmore44 is offline   Reply With Quote
Old 09-04-2012, 01:13 PM   #22
peter650
Gnarly Adventurer
 
Joined: Oct 2009
Location: Sydney
Oddometer: 417
Quote:
Originally Posted by Twin-shocker View Post
If so then I wonder why MX-enduro bikes used WOT for long distances (beach racing is a good example), are jetted and set up to stop them seizing on the very long straights?
Gday Twin shocker he wants to ride his bike on the road. It is not the cooling system, thats going to be a problem. You can jet a 2 stroke MX motor to run on the street, & it will not over heat on the open road. If you have a exhaust port bridge, drill 2 holes in the piston. Most old MX 2 strokes will surge on the street, but you can fix that with jetting. Just look at all the old 2 stroke GP bikes. Cheers Peter
peter650 is offline   Reply With Quote
Old 09-04-2012, 01:17 PM   #23
peter650
Gnarly Adventurer
 
Joined: Oct 2009
Location: Sydney
Oddometer: 417
Quote:
Originally Posted by JWhitmore44 View Post
I used to run my old DT250 35 miles to the next town. Crused 55 to 60 mph, speed limit was 55. Air cooled, oil injection, never heard of varying the rpm, pulling in the clutch, or applying the choke. It's a wonder I didn't go up in flames Are you really running with the throttle wrapped clear around? Find a comfortable cruising speed and don't rap it out tight. Unless you are running lean on the top end of the throttle opening I can't see where you would get into too much trouble. Both bikes you are talking about are water cooled aren't they? Thought those bikes were "enduro" types were it could see a long stretch of high speed through desert like conditions.
+1 on all the above
peter650 is offline   Reply With Quote
Old 09-04-2012, 03:40 PM   #24
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
[QUOTE=peter650;19517731]Gday Twin shocker he wants to ride his bike on the road. It is not the cooling system, thats going to be a problem. You can jet a 2 stroke MX motor to run on the street, & it will not over heat on the open road. If you have a exhaust port bridge, drill 2 holes in the piston. Most old MX 2 strokes will surge on the street, but you can fix that with jetting. Just look at all the old 2 stroke GP bikes. Cheers Peter[/QUOTE

Riding on the road and beach racing are pretty much the same thing...........heat is what kills a 2T motor, and the reason for bigger jets is to provide a richer mixture which in most cases will lower temperatures enough to prevent seizing. If you take it easy though, the stock cooling system will be able to cope no problem..........but not WOT with stock size jets.
Twin-shocker is offline   Reply With Quote
Old 09-05-2012, 06:23 AM   #25
MItrnsplnt OP
PllnGs tillthey puke
 
MItrnsplnt's Avatar
 
Joined: Jan 2007
Location: Brigantine, NJ
Oddometer: 658
Totally agree with what everyone is saying, and I appreciate all the info....I don't plan on riding at WOT on the road, I was just concerned about connecting trails with paved roads for extended stretches of 10-25 miles (which is what we recently did on our CO trip a few weeks back). Still trying to understand everything and get back to the 2T world (which I haven't done yet, but will be soon)....by having a bigger jet and making it richer in the carb to provide more lubrication for those longer stretches, wouldn't that give me a higher probability of fouling a plug when riding ST up in the mountains at a lower RPM's and not having the throttle wide open? Would a JD jet kit give me a good all around setting for roads and ST or is a matter of trying to mate bigger jets with what might currently be in the bike?
__________________
'09 KTM 530EXC (do-it-all workhorse)
'04 KTM 250EXC (ST switchblade)
'13 Sherco 3.0 (trials billy-goat)
Rocky Mountain Ride 2011: Aspen to Crested Butte and back
http://advrider.com/forums/showthread.php?t=723271
MItrnsplnt is offline   Reply With Quote
Old 09-05-2012, 02:40 PM   #26
peter650
Gnarly Adventurer
 
Joined: Oct 2009
Location: Sydney
Oddometer: 417
The jets do over lap, but out on the open road, your going to be on your main jet. The thing with dirt bikes, they jet them so they are crisp/snappy. You will loose a little throttle response, but nothing to about. Just remember the more oil, you mix in your gas, the leaner your bike will run.
peter650 is offline   Reply With Quote
Old 09-05-2012, 11:31 PM   #27
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
Quote:
Originally Posted by MItrnsplnt View Post
Totally agree with what everyone is saying, and I appreciate all the info....I don't plan on riding at WOT on the road, I was just concerned about connecting trails with paved roads for extended stretches of 10-25 miles (which is what we recently did on our CO trip a few weeks back). Still trying to understand everything and get back to the 2T world (which I haven't done yet, but will be soon)....by having a bigger jet and making it richer in the carb to provide more lubrication for those longer stretches, wouldn't that give me a higher probability of fouling a plug when riding ST up in the mountains at a lower RPM's and not having the throttle wide open? Would a JD jet kit give me a good all around setting for roads and ST or is a matter of trying to mate bigger jets with what might currently be in the bike?
As I posted earlier bigger jets are fitted to provide a richer mixture to help motors run cooler, not for increased lubrication. If you dont plan on riding WOT, and take things easy and vary engine speed, then the the stock jetting will be fine.
Twin-shocker is offline   Reply With Quote
Old 09-06-2012, 06:40 AM   #28
WVhillbilly
Beastly Adventurer
 
WVhillbilly's Avatar
 
Joined: Oct 2010
Oddometer: 9,052
On my EXC, in the woods the radiator barely gets warm. But I do notice the heat coming from it on the road.
I still don't run fast or anywhere near WOT on the road, and try to limit the amount of time I spend there.

Because that bike is really no fun on the street.
WVhillbilly is offline   Reply With Quote
Old 09-08-2012, 10:50 PM   #29
pdxjim
Two Stroke Terror
 
Joined: Sep 2009
Location: Portland, OR
Oddometer: 128
Quote:
Originally Posted by Twin-shocker View Post
Fitting bigger jets might stop a dirt bike seizing when its ridden on the road, but it wont alter the fact that the cooling system isnt designed to dissipate the amount of heat resulting from wide throttle openings for long periods of time.
Hogwash.
pdxjim is online now   Reply With Quote
Old 09-09-2012, 12:48 AM   #30
Twin-shocker
Beastly Adventurer
 
Joined: Jan 2012
Oddometer: 1,673
I wonder if you have ever ridden in the SSDT, where 2T dirt bikes cover a lot of miles on the road at wide throttle openings? Competitors in that event will be very interested to learn that overheating and seizure is not likely to be a problem!
Twin-shocker is offline   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 PM.


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