6 posts in this topic

First i want to thank everyone for their input into the vast amount of knowledge that can be found on this site. It makes life a bit easier and interesting for people like me.

MY question is about fitting a ltz400(or klx400)cylinder head onto a drz400. I've searched the forum quite a bit and need to be sure a couple of things.

1. I've read that the ltz400 head is a direct fit for the drz but i would need to plug the manual decomp if i'm putting the cylinder head on a drz400s model. How exactly is this done?I'm assuming the ltz400 head has manual decomp

2.If i were to buy a ltz400 head to put onto a drz400s, would it make a difference whether i bought the assembly parts (cams,valves,shims,springs,etc) for the drz or for the ltz?

3.I've read that the klx400 head is a direct fit also. Is there a specific year klx400 that only fits?

Thanks in advance for the responses!

Edited by mrwindta

Share this post


Link to post
Share on other sites

I don't know the details but the later FI quad models have a different part number than the previous models.

Also, the quads use a single valve spring as opposed to the bikes dual. As a result they have a lower rev ceiling. They used to swap the valve springs for the DRZ's when building their race motors.

1 person likes this

Share this post


Link to post
Share on other sites
7 hours ago, mrwindta said:

First i want to thank everyone for their input into the vast amount of knowledge that can be found on this site. It makes life a bit easier and interesting for people like me.

MY question is about fitting a ltz400(or klx400)cylinder head onto a drz400. I've searched the forum quite a bit and need to be sure a couple of things.

1. I've read that the ltz400 head is a direct fit for the drz but i would need to plug the manual decomp if i'm putting the cylinder head on a drz400s model. How exactly is this done?I'm assuming the ltz400 head has manual decomp

2.If i were to buy a ltz400 head to put onto a drz400s, would it make a difference whether i bought the assembly parts (cams,valves,shims,springs,etc) for the drz or for the ltz?

3.I've read that the klx400 head is a direct fit also. Is there a specific year klx400 that only fits?

Thanks in advance for the responses!

So may I ask why you want to put an LTZ400 head on? Are you getting one for cheap, or have a friend who will give you one? You don't sound like a wrencher so why open a can of worms? Buy something made for either the KLX400 or DRZ400.....pretty much any year. :thumbsup:

1 person likes this

Share this post


Link to post
Share on other sites

The LTZ didn't have a manual decomp so no need to plug. For putting on an S model , just bolt it on and go , but as said valve springs are single spring, but if you don't run it at the rev limiter it'll work fine but the duals are better for for highway use , there is a reason Suzuki changed them. If you have a good LTZ head for cheap I'd go for it and change the springs. Problem is then how good are the valves and seats , always good idea to do the seats and put better valves in while the head is off.

 

.

1 person likes this

Share this post


Link to post
Share on other sites
4 minutes ago, jjktmrider said:

The LTZ didn't have a manual decomp so no need to plug. For putting on an S model , just bolt it on and go , but as said valve springs are single spring, but if you don't run it at the rev limiter it'll work fine but the duals are better for for highway use , there is a reason Suzuki changed them. If you have a good LTZ head for cheap I'd go for it and change the springs. Problem is then how good are the valves and seats , always good idea to do the seats and put better valves in while the head is off.

 

.

Thanks, that pretty much answers my questions.

1 hour ago, Signman606 said:

So may I ask why you want to put an LTZ400 head on? Are you getting one for cheap, or have a friend who will give you one? You don't sound like a wrencher so why open a can of worms? Buy something made for either the KLX400 or DRZ400.....pretty much any year. :thumbsup:

I started rebuilding a drz seized bottom end that i've been having for a while and i need to buy a head for it.So i'm just sorting through my options before i start spending. This is actually the first time i've attempted wrenching on a bike engine.

2 people like this

Share this post


Link to post
Share on other sites

Yeah .. the smart option is to fit new valve gear on a used head , regardless what the previous owner tells you .

having the seats re cut only helps performance. 

1 person likes this

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

  • Similar Content

    • By AKmotorider
      So guys, I need some input from someone who has suffered a debilitating head injury, or TBI. A mild concussion doesn't count. TBI is essentially a concussion, but far worse. To put things into perspective, I was in a coma for five days after my motorcycle accident (this was on the street). Am I saying that you need to have gone through the same thing? No. However, I would like some input from someone who has suffered a debilitating injury, maybe just an injury of any kind, and had to make the decision about whether to ride the following year.
      I'm twenty-one years old, and have raced motocross every summer since I was fourteen. It makes me feel... well, I'm not really sure how to describe it. My life is rather mundane, but when I get on that bike and race, I feel alive and in control for however long I'm riding it. I live in Alaska, by the way, so summer is like five months max.
      Point is, the injury will not be the hardest thing I've ever had to go through, if I do indeed decide to stay off the dirt bike this summer. The hardest thing, guaranteed, that I will have gone though, is to have stayed off the bike this summer. It is one of the very few things I truly love in life, and I fervently look forward to it every year. I do nothing in the winter.
      Buuuut, and this is a big but, I'm also not an idiot. My brain injury occurred in very late September of last year. If you all think it's more than just wise, but critical, to stay off the bike this year, just like my doctor thinks (but you know doctors... always over-protective of your physical health, like parents), then I will stay off of it this year. Looking up at that bright sun, experiencing the peak of summer greatness, it will undoubtedly be monumentally difficult to put riding into the back of my mind, but I can do it.
      What do you think?
      Thanks!
    • By skippy1369
      I tried to post this last night, but something was messed up with the link. I think it's right now.
      Looking for any advice or thoughts about the bike listed below. I'm planning on riding it locally for a year or so, and then riding the TAT. Any thing i should be worried about?
      https://worcester.craigslist.org/mcy/6028885755.html
       
      Thanks!!
    • By skippy1369
      I'm looking at buying this bike. Anything I should be worried about?
      https://worcester.craigslist.org/mcy/6028885755
    • By JungleDeath
      Feeling the need to make my DRZ400sm more dirt worthy. I still need to commute, errand, adv, general everyday use. Was strongly considering going to a 2.5" (max) wide 19" front rim for better dirt-worthy steering especially in sandy situations. Currently on Shinko 705's and OE 17's. The rear is fine, the front is not. I have bicycle wheel building background so I was going to rebuild a 19" rim to the OE hub with new spokes and nipples. 
      Questions:
      Does anyone here have any experience on any bike with a 19/17 combo? Love to hear.
      Can you really use a rear 19" mx wheel and re-lace it to the front hub?
    • By perry2413
      I'm looking for the coolant reservoir for a DRZ400 along with the mounting hardware and hoses if possible. I'm having no luck for finding someone parting theirs out locally. Thanks!