HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
matt_sta71

More problems with 98 yzf 400

4 posts in this topic

Well I had to re tap the drain plug hole. still leaks so maybe new plug is alittle small? anyways now I am having overheating issues. While going up an incline water pretty much boils right out the top of the radiator and out the drain tube. Do i need to flush the radiator? or could it be the water pump? help me out here guys oh ya and the bike, before i got it, hada 426 head put on

Share this post


Link to post
Share on other sites

Sounds like the radiator cap spring has had it,try teflon tape around the threads of your drain plug that may help with the oil leakage & invest in a new radiator cap.

Share this post


Link to post
Share on other sites
Well I had to re tap the drain plug hole. still leaks so maybe new plug is alittle small? anyways now I am having overheating issues. While going up an incline water pretty much boils right out the top of the radiator and out the drain tube. Do i need to flush the radiator? or could it be the water pump? help me out here guys oh ya and the bike, before i got it, hada 426 head put on

HI,

Try to give a some help. Most of the 98's had water pump impeller problems and issues with the water pump. boysen set up would probably help a lot. I stripped out my drain plug in my YZ426F when I had it. I put a heli-coil in it and it worked for awhile. But then I had problems down the road, and ended up putting a time cert in it. Its like a heli-coil but its a whole piece not just threads. Its made of steel and you have to epoxy it in. It is permanent once installed and will never strip out again. You might have trouble getting at local parts store( advance auto, pep boys ). I think I bought mine napa, not really sure though ? Napa is usually better with specialty parts. Good luck

Share this post


Link to post
Share on other sites

For overheating, my friend had issues with his 400 for a long time overheating. When he finally lost the crank, he inspected all the cooling and oiling lines. He found that from the factory, the locating dowls for the external oil lines, one of them was crushed cutting off the oil supply.

Once he got it back together (big bore) and a new dowl there, it has never overheated again.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0