YZ400f - Page 5

Wopstar · 05-07-2007, 02:27 PM

That sucks going from a thumper to a 2 stroke. I ride my buddies 02 KTM 250 sometimes and the only thing I like better is how light and easy to handle it is, other than that I would not trade my bike for anyhting but another thumper.

Wopstar · 05-07-2007, 02:29 PM

Where is the pic? Did you try putting a different gas cap on it?

JThompson · 05-07-2007, 11:34 PM

He posted his pic here
http://www.mototips.com/gallery/3047-yz400f.html

DirtriDER · 05-08-2007, 04:09 AM

haveny tried the cap but i need something im losing gas and gas isint cheap

DirtriDER · 05-08-2007, 04:10 AM

and how often do i need to rebuild.

JThompson · 05-08-2007, 11:30 PM

going to get tig in this thread he may have some insite here...

tigmaster · 05-09-2007, 09:07 PM

alright, i have been reading these posts, but im not sure exactly what your problems are. its looks like you changed your vent hose. did you put the fuel check valve back in line with the hose. the valve only lets air in and keeps gas from comming out when you dump your bike. it also can keep water out more so than a straight hose. elaborate a little bit on your problems and i will get it solved.

DirtriDER · 05-10-2007, 05:42 PM

? i dont under stand i have never had a bike that had a valve in it always a strait hose. and i need to know how often i need to rebuild. i dont ever studder out the motor or any thing because the piston alone is $170 but i was just wondering thanks for the help.

tigmaster · 05-10-2007, 06:01 PM

as far as the hose, the valve is a useful thing that i couldnt stand not having on my old bike. and with rebuild time, if you ride a decent amount you should try to get new rings every 4-6 months and a new piston every year to year and a half. if you ride real hard and every day i would suggest rings every 3-5 months and a piston every 6-8 months. also valves should be checked and shimmed if necessary every month. when you put in new rings, try to get your valves lapped, only if they are NOT TITANIUM. DONT LAP TITANIUM VALVES! new valves can be installed every 2 or so years. if they are titanium you might be pushing them to get 2 years. i bought my 2004 rmz250 which had been lightly ridden and the valves were completely trashed. idk, if u start to notice a diff in power then its time for a rebuild

DirtriDER · 05-11-2007, 04:21 AM

ok thanks man

05-07-2007, 11:34 PM	#43 (permalink)
JThompson Administrator Join Date: Aug 2006 Location: Bellingham WA Posts: 5,163 iTrader: (6)	He posted his pic here http://www.mototips.com/gallery/3047-yz400f.html __________________ Tired of ads? Become a member for an almost ad free site! Also we give away monthly prizes just for posting! Register today! Looking for places to ride! Want to review a riding area? Check them out! PRE-ORDER MOTOTIPS Stickers now. Help keep mototips running! Get your order in today! Buy NOW! Special Discounts for members only! Check out our new discount forum for retailers offering to help you save money! Mototips Discounts

05-08-2007, 11:30 PM	#46 (permalink)
JThompson Administrator Join Date: Aug 2006 Location: Bellingham WA Posts: 5,163 iTrader: (6)	going to get tig in this thread he may have some insite here... __________________ Tired of ads? Become a member for an almost ad free site! Also we give away monthly prizes just for posting! Register today! Looking for places to ride! Want to review a riding area? Check them out! PRE-ORDER MOTOTIPS Stickers now. Help keep mototips running! Get your order in today! Buy NOW! Special Discounts for members only! Check out our new discount forum for retailers offering to help you save money! Mototips Discounts

05-09-2007, 09:07 PM	#47 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,659 iTrader: (1)	alright, i have been reading these posts, but im not sure exactly what your problems are. its looks like you changed your vent hose. did you put the fuel check valve back in line with the hose. the valve only lets air in and keeps gas from comming out when you dump your bike. it also can keep water out more so than a straight hose. elaborate a little bit on your problems and i will get it solved. __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here

05-10-2007, 06:01 PM	#49 (permalink)
tigmaster Administrator Join Date: Aug 2006 Location: Missouri, United States Posts: 7,659 iTrader: (1)	as far as the hose, the valve is a useful thing that i couldnt stand not having on my old bike. and with rebuild time, if you ride a decent amount you should try to get new rings every 4-6 months and a new piston every year to year and a half. if you ride real hard and every day i would suggest rings every 3-5 months and a piston every 6-8 months. also valves should be checked and shimmed if necessary every month. when you put in new rings, try to get your valves lapped, only if they are NOT TITANIUM. DONT LAP TITANIUM VALVES! new valves can be installed every 2 or so years. if they are titanium you might be pushing them to get 2 years. i bought my 2004 rmz250 which had been lightly ridden and the valves were completely trashed. idk, if u start to notice a diff in power then its time for a rebuild __________________ --'03 CRF450r-- --FMF Pipe, Pro-Tech Revavle-- --Vortex Basket With Tusk Disks And HP Springs-- --Pro Taper Triple Clamps And Bars-- --Devol Full SP With Moose HGs-- --Renthal 13/50 With R1 Chain-- --Now It Is The End, Probably...-- --'06 CBR F4I-- --Bone Stock-- Check Our Latest How-To Here Last edited by tigmaster; 05-10-2007 at 06:05 PM.

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05-07-2007, 02:27 PM	#41 (permalink)
Wopstar A Rider Join Date: Sep 2006 Location: Lake Havasu Arizona Posts: 966 iTrader: (0)	That sucks going from a thumper to a 2 stroke. I ride my buddies 02 KTM 250 sometimes and the only thing I like better is how light and easy to handle it is, other than that I would not trade my bike for anyhting but another thumper.

05-07-2007, 02:29 PM	#42 (permalink)
Wopstar A Rider Join Date: Sep 2006 Location: Lake Havasu Arizona Posts: 966 iTrader: (0)	Where is the pic? Did you try putting a different gas cap on it?

05-08-2007, 04:09 AM	#44 (permalink)
DirtriDER C Rider Join Date: Apr 2007 Location: Crab Orchard, KY Posts: 136 iTrader: (0)	haveny tried the cap but i need something im losing gas and gas isint cheap

05-08-2007, 04:10 AM	#45 (permalink)
DirtriDER C Rider Join Date: Apr 2007 Location: Crab Orchard, KY Posts: 136 iTrader: (0)	and how often do i need to rebuild.

05-10-2007, 05:42 PM	#48 (permalink)
DirtriDER C Rider Join Date: Apr 2007 Location: Crab Orchard, KY Posts: 136 iTrader: (0)	? i dont under stand i have never had a bike that had a valve in it always a strait hose. and i need to know how often i need to rebuild. i dont ever studder out the motor or any thing because the piston alone is $170 but i was just wondering thanks for the help.

05-11-2007, 04:21 AM	#50 (permalink)
DirtriDER C Rider Join Date: Apr 2007 Location: Crab Orchard, KY Posts: 136 iTrader: (0)	ok thanks man

LinkBacks (?) LinkBack to this Thread: http://www.mototips.com/yz400-yz426-yz450/2850-yz400f.html
Posted By	For	Type	Date
YZ400/YZ426/YZ450 [Archive] - Mototips	This thread	Refback	10-16-2007 06:40 AM
Mototips	This thread	Refback	05-11-2007 02:43 PM

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