16
Technical / Calling on 2001 CR125 owners
« on: December 29, 2012, 10:39:05 AM »
Do you grip your bike with your legs? That could reduce arm pump if not eliminate it.
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17
Technical / Calling on 2001 CR125 owners
« on: December 28, 2012, 03:53:41 PM »
Stock springs settings are for a rider of 80kg according to racetechs calc.
If the 90 you weight are kg I reckon you don't have stock springs or the forks internals are dirty.
Best is to start at the rear shock and linkage. If the linkage is not well maintained all bets a re off anyway.
That alone could be the reason for harshness although more at the rear.
If the 90 you weight are kg I reckon you don't have stock springs or the forks internals are dirty.
Best is to start at the rear shock and linkage. If the linkage is not well maintained all bets a re off anyway.
That alone could be the reason for harshness although more at the rear.
18
Technical / Calling on 2001 CR125 owners
« on: December 28, 2012, 12:21:30 PM »
How much do you weight?
19
Technical / 2001 CR125 jetting help
« on: December 21, 2012, 01:25:00 PM »
With an SST I would rather lean into the rich side of jetting than going leaner. I would try for a different needle.
Pistons, the pro x lite come in different sizes, at least for Yamaha, what brand is your bike?
Pistons, the pro x lite come in different sizes, at least for Yamaha, what brand is your bike?
21
Technical / Clutch will not engage.
« on: December 02, 2012, 12:28:39 PM »
Are all the parts where they supposed to be?
22
Technical / Clutch won''''''''t release
« on: December 02, 2012, 12:26:07 PM »
Check the thickness of the plates, the manual gives you the numbers to keep them in specs.
How old is that clutch? Maybe its just worn out?
How old is that clutch? Maybe its just worn out?
23
Technical / Newbie few minor problems on new YZ 250 ''''''''''''''''04.
« on: October 31, 2012, 11:39:15 AM »
I read about benefits of the higher charge, hard to tell if they are true, before I had hardly 70psi in there.
As for you suspension I'd give the company a call.
As for you suspension I'd give the company a call.
24
Technical / Transmission Oil
« on: October 29, 2012, 10:14:17 PM »
I like ATF mineral pretty conveniently priced, cleans the clutch good and gets changed @ 8 hours.
25
Technical / Newbie few minor problems on new YZ 250 ''''04.
« on: October 29, 2012, 11:46:54 AM »
Sound like you need a new water seal of the water pump shaft. Maybe also the shaft. Did you look up the piston? When buying a used bike that is the first thing I could do. The shock you could repair it with a new shredder valve. It happened to me and I used a car tire valve. So far it is OK I think on the YZ250 you can change the valve anyway. The shock uses nitrogen 140psi is stock, I use 150psi.
It is quite easy to do all the work yourself. Top end, Water pump shaft seal ( maybe also the shaft) plus the shredder valve you looking at about 4 to 6 hours.
It is quite easy to do all the work yourself. Top end, Water pump shaft seal ( maybe also the shaft) plus the shredder valve you looking at about 4 to 6 hours.
26
Technical / New rider and hope you can help with some questions
« on: October 16, 2012, 07:17:18 PM »
If you just got the bike do yourself the favor and have a look at the piston, cylinder and lower bottom end. All of which could cause you mayor grief when failing. Just the piston you could just pull the exhaust pipe, all the other you need to pull the cylinder, flywheel cover of clutch engine cover.
Doing that will set you back about one hour if fast 2 if slow.
Doing that will set you back about one hour if fast 2 if slow.
27
Technical / Troubleshooting 2nd seizure on KX 125
« on: October 14, 2012, 04:43:15 PM »im using a premix of 40:1 with a fully synthetic oil, the manual suggests 32:1 but I ended up increasing the ratio because I was fouling plugs. A few experienced riders told me they run the same so I didnt think it would be a problem, maybe its time to get back to 32:1 and change the jetting.
So far I know the premix has not that much to do with fouling plugs but with the an engine not hot enough when ridden. Oil premix ratio has a lot to do with the rider style of each of us. The harder you ride the more premix you should use. Side effect would be a better ring seal with a higher premix ratio. When I started on my 2 smokers I ran 50:1 and had some problems with lean seizure along the way I went to 40:1 then 30:1 and now I'm at 22 to 25:1 no spooge no fooling plugs but you need to ride the bike hard to get that.
I sold my trusted RM125 to a kid, jetted for me, premix oil ratio at 40:1. Long story short got the bike back a week later spooge ouzing out of almost every possible opening. Went from needle in 4rth to Needle in 1rst and lowered the main from 180 to 165. That suited his riding style way better.
You will hardly find anyone riding the way you are except you are in the pro class level
So each rider takes care of his/her bike in a different way. Some people change pistons at 50 others @ 100 and I changed the piston on my RM 125 @ 10 to 15 hours. Now I re-plate @ 150 hours per cylinder, do a bottom end @ 150 to 180 hours and won't re-plate a cylinder more than 3 times.
28
Technical / Troubleshooting 2nd seizure on KX 125
« on: October 14, 2012, 10:27:45 AM »
over 100 hours on a 125 2 smoker piston? I find that hard to believe.
29
Technical / Troubleshooting 2nd seizure on KX 125
« on: October 13, 2012, 05:36:33 PM »
In the whole thread I could not find a premix ratio number. IMO after the first seizure I'd have done bottom end regardless of how good or new the bearings and seals were. With a lost screw floating around there I would not take the risk. A 125 ridden normally should get a new piston at intervals closer to 15 hours than to 30. A good premix ratio is 30:1 a better one is 25:1 specially when running in sand, dessert or open roads.
A rebuild has a lot of specific specs you have to take into consideration. Piston clearance and the clearance of the valves in regards how deep they wander into the cylinder. Those 125 are race engine and one should treat them as such
A rebuild has a lot of specific specs you have to take into consideration. Piston clearance and the clearance of the valves in regards how deep they wander into the cylinder. Those 125 are race engine and one should treat them as such
30
Technical / Rain and Wind problem(2000 RM 125)
« on: October 05, 2012, 05:11:46 PM »
First question: How old is the top end? Second: do you clean the carb regular?