hey guys new to the site hoping you all can help i have an 06 ltz400 (06) it has a rev box knn and a pipe i just got the bike about a week ago. tried to start the bike with the start button and had to jump the battery with my truck or i would have killed it after about a hour of i got it to start
when the bike got hot i was abel to start the bike right up put
if i pull the bike with a atv it will start right up and runs grat (fast)
i did a comp test and got 30psi i think this is very low

can someone help i just would like to fix it and ride

 

I'll bet money that your valves are too tight. Have your valves adjusted and you should be good to go.

 

well i ceck and one of the intake valves tigh so i ordered new valves (4) and sprind do think i can just replace them and reset the lash and go

 

You didn't need to order new valves & springs. You need a lash cap kit ( about $60-70). The Z400 engine uses a bucket shim over the stem & you use different thickness buckets to set the lash. Cancel that order of valves & springs and get yourself a lash kit ASAP!!

 

well i removed the head and valves and found that the one intake valve was cuped so replaced all 4 valves andsprings set the lash and it starts right up

 

how long do you think i sould break it in for

 

That's good to hear. I would say really no specific break-in time, but for sure after about 10hrs check the lash again.

You musta already had the head off when you posted before to know you had a bad valve?? Are you running a good air filter & keeping it clean?? Sounds like it had been sucking dust for awhile & hammered that valve & seat .

 

well guys i think something went wrong after a nice 15hr brear in and a recheck took the bike out and started to run it and it was running great and than it just shut of and now i cant turn it over please help

 

i was with stangboy when this happened. sucked ***.

 

Ive been having the same problem as stangboy. My z400 has been sitting in storage for about 3 months, because of the cold...I tried starting it the other day and it just cranked but no start. I figured it was the spark plug so i replaced it and still nothing, same thing. Someone informed me that it may not be getting any fuel, i tested the spark plug by grounding it to the side of the cylinder head and there was a spark...i threw a spray of starting fluid in the carburatur but still the same thing. Ive read on local forums that the z400's have cheap stock valves in them. I havent checked the compression on it yet but i will tomorrow...what should i be looking for and what do i do if the compression is low? I need a quick fix just to sell it, if there is one. Thanks for anyones help!