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.

11 posts in this topic

Gday

 

A guy wants to swap a Freshly rebuilt wr400 99 model with a high compression piston for my 1990 dr350

 

I rode the bike and is great, very smooth and nice power delivery 

 

It isn't in best shape tho

 

That isn't my reason for the topic tho how ever this is... I'm 65kg and I can start it, Nor could he so we tow started it, is there a tequnique for starting these beasts is question 1 and number two is do I have to use premuim petrol instead of normal unleaded to prevent the motor detonating from high comp piston... Will it blow the bottom up anyway??

 

 

Any advice would be muchly appreciated because i have to make my mind up within 5 days!

 

Cheers toby

Share this post


Link to post
Share on other sites

Run away from it

Unless you want to learn about rebuilding the head....sounds like the classic leaking intake vale problem

Share this post


Link to post
Share on other sites

Run away from it

Unless you want to learn about rebuilding the head....sounds like the classic leaking intake vale problem

Valve? If the valve is leaking wouldn't it have little compression? It has very high compression

Share this post


Link to post
Share on other sites

Valve? If the valve is leaking wouldn't it have little compression? It has very high compression

 

You mean, if feels hard to kick.....that has nothing to do with it.

 

If this 17 year old motor has not had a complete valve job yet, and you buy it, you will have to do it, because everything wears out....including the valve train.

 

If it starts by towing/bumping, then runs and idles fine, that is a classic symptom of a intake valve the is either leaking, or more likely, sinking into the head from age and not opening enough, and leaking.

Share this post


Link to post
Share on other sites

O

 

You mean, if feels hard to kick.....that has nothing to do with it.

 

If this 17 year old motor has not had a complete valve job yet, and you buy it, you will have to do it, because everything wears out....including the valve train.

 

If it starts by towing/bumping, then runs and idles fine, that is a classic symptom of a intake valve the is either leaking, or more likely, sinking into the head from age and not opening enough, and leaking.

Ok thanks makes sense

 

 

The original owner was heavier and could start it easily apparently tho

Share this post


Link to post
Share on other sites

O

 

Ok thanks makes sense

 

 

The original owner was heavier and could start it easily apparently tho

 

You said he had to tow it 

Share this post


Link to post
Share on other sites

You said he had to tow it 

The guy I'm buying it off has only had it for a week as he is way to short for it and only weighs 62kg and so had to tow start it for me, the guy he bought it off could start it because he was a lot heavier, however idk this could be a lie so am trying to find out if there is a specific technique for starting it

 

That should make more sense 

Share this post


Link to post
Share on other sites

So you roll it just past TDC pull the decompression leaver and give it a kick.... is that what you are doing and it wont start?

Share this post


Link to post
Share on other sites

So you roll it just past TDC pull the decompression leaver and give it a kick.... is that what you are doing and it wont start?

I think the guy was trying that 

 

Correct me if I am wrong but apparently you push kicker down till it hits compression without decomp. Then Pull in decomp. and push the kicker 1-2 inches down, let decomp. out and let the kicker all the way up then give her a big kick in the guts

 

E start would be great

1 person likes this

Share this post


Link to post
Share on other sites

I think the guy was trying that 

 

Correct me if I am wrong but apparently you push kicker down till it hits compression without decomp. Then Pull in decomp. and push the kicker 1-2 inches down, let decomp. out and let the kicker all the way up then give her a big kick in the guts

 

E start would be great

Yeah mate that's it, been a long time since i have done it hahaha! if you cant feel any difference could be a problem the the decompression mechanism.  

Share this post


Link to post
Share on other sites

Yeah mate that's it, been a long time since i have done it hahaha! if you cant feel any difference could be a problem the the decompression mechanism.  

Yeah fair enough!

 

Decomp does work, could be spark plug

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 ChristianMX
      I've been in the hospital for two months. During those two months I was bed bound so I didn't move so I got really weak. After that they made me go to physical therapy for 2 and a half weeks. I was discharged two days ago.  I'm a 21 year old male. I was burned 57 percent of my body with 3rd and 2nd degree burns on both my legs, my back, butt, and right arm. Mainly the back of the areas are burned but the front isn't as bad as the back. Anyways, I had to learn how to walk again and as I see my progress, I can't help but wonder will I ever be able to ride again? My strength is coming back slowly but I still feel stiff and very weak. Has anyone else on this board gone through this? I would hate to give up on riding due to this. No smart ass comments please and no rude answers. Thank you! 
    • By charl_o
      Hi there ! 
      I'm currently looking for a used 125cc 2 strokes between 2000 and 2007.
      ME: I'm form Québec/Canada,  I'm a 5.4 foot tall, i weight 130, i mostly ride trails(on dirt, sand, rocks) but i really like to jump, climb on some small rocks(a bit like trial) , and i do ride enduro style too. 
      I CURRENTLY RIDE: an XR200a 1984 (with absorber) i really like that bike, it's undestructible and i can ride for ages with one tank. The downsides are the suspensions and the speed limit.
      I WANT: a light, 2stroke, 125cc, which i can use all around. I want to pay max 3000$cad. 
      I did some research and found that the YZ 125 is a pretty notorious bike, and more notorious are the 2006+ because of the suspension, motor, weight, improvements. That being said, i'm not close for any other brand. The one thing i'm concerned with is the gas consumption. I can do 2, 3 rides with my XR(4stroke, of course) before it got bone dry. I don't ask for the same results but i just don't want it to run out after 1 1/2hr -2hrs ride. I would really like a bike i can easily find parts.
      During my reseach i fell on a steel vs ali frame thread, i'm also concerned about it. Being a Vintage dirtbike rider ATM i can say i love the way it feel. I tried my friend 2017 TE300 and it was great but it felt like the bike was SOOOOOO DAMN STIFF !! OMG, myself being small and light, i wasn't comfortable AT ALL on it. I don't think i could see a difference between a steel and an ali frame and i wonder if i could see a difference between 2002 Yz vs 2007 YZ's suspension too ??
      HOW MUCH should i pay for a STOCK bike between 2000 and 2007 ?? (i know there can be that bike which as been redone and all, but just overall stock )
      Anyway, i  probably forget to write some lil thing but overall this is it, i'm looking for a 125, 2t !!!
      Thanks you very much for your time ! have a nice day
    • By Caleb Barger
      Every one post their pics of your supermoto! I'm just trying to get some ideas on what to do next! I just orderd the 36mm pumper carb from XR's only, and tonight I am going to order some under bar mirrors! Here's what she looks like right now




    • By ssrstunter
      What's going on guys, so I'm making my ssr 125 into a stunt bike, i put rear pegs on and I need to make a rear handbrake setup, I was thinking of buying a front brake setup and disconnecting the hose with the banjo bolts and buying a longer hose, then making a bracket to mount the caliper on, would that work? does anyone have a setup that they know forsure works that won't cost an arm and a leg?