Jump to content
Sign in to follow this  

xr 400 smoking

Recommended Posts

Guys I just picked up 97 xr 400 at a cheap price. It was in storage for two years. It runs good but it smokes white smoke constantly. It is blowing oil out the exhaust as well. I checked the valves they are in spec. I changed the oil and only put in under 1.9 qts and checked the level and it's good.

I cleaned the air filter thoroughly. The bike runs strong. I have not done a compression test but I know it's either the valve seals or the rings. What is your best guess? I have run the bike for a while in the woods and really ran it hard hoping the seals would swell or the rings would unstick if that were a problem.

Let me know what you think. Smoking in Pittsburgh.

Share this post


Link to post
Share on other sites

What exhaust does it have on it? Stock or something else?

White smoke usually says "water or coolant somewhere it shouldn't be" to me, but since the XR doesn't run coolant....................

When you changed the oil was the old stuff milky or gray looking?

Share this post


Link to post
Share on other sites

It has pro circuit exhaust. It was not milky but could have been gray. When I changed the oil it was low because of all the oil its blowing out the exhaust. The oil didnt' look good but it didn't have any metal in it? I am really thinking it's the rings and if I am going to replace them and take the head off I am going to replace the valve seals. I just wanted a good opinion before I take the head off.

Share this post


Link to post
Share on other sites

If it's not overfilled and it's blowing oil, I would say rings too.

Does the Pro Circuit use a packing or is it baffled? If a packing, if it is water/oil soaked you might get some while smoke.

Share this post


Link to post
Share on other sites

The pro circuit is just baffled. I think I will take the head off over the holiday weekend and look at the size of the piston to order the appropriate rings.

If you have any more advice let me know thanks.

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

Reply with:

Sign in to follow this  

  • Similar Content

    • By 661Bran28den661
      What’s up guys. Totally new here picked up an XR400R I live in the desert so I’m riding often and enjoy it. But I am having some issues with my  01 XR400R. I brought it out this morning for a putt and it seems to be choking up in the top of second. Like a bog an go bog an go. First seemed fine and third I didn’t make it high enough into the rpms to see. Before I brought it back to the garage. Yesterday I also changed the air filter back to an uni. I had seen the other one had a hole in it and the box was dirty gunned up and oily. I removed the airbox gave it a good clean out wiped everything down very well put a piece of screen over the snorkel Or where it used to be I should say. “Lightly oiled the filter.Also the spark arrester an tip for the bike it did not come with I ended up making one with a piece of flat steel and drilling holes. Whilst doing this. I found also a crack in the pipe. It almost sounds as like there’s a vacuuming or whistle? When revving.The first one I had made worked fine I had no issues. This one I am wondering maybe if it’s a cause of a little too much back pressure.So I’m assuming it’s either a Carb or exhaust problem. Or something that could totally be minuscule. Or major issue. Would definitely like some second opinions and any advice would be greatly appreciated. Thanks guys! 
      TWISTIN THROTTLES & CRACKN BOTTLES


    • By ddickinson
      My lanky 14 year old boy started showing an interest in riding MX/Off-Road so I sourced the best beginner friendly, yet dirt worthy, bike I could find: an Ol' Honda XR250R (2004). So far I've replaced a few clutch levers and perches with stock parts. That's gotten old and I'm looking to upgrade to an ASV or Torc1 type fold-able clutch/perch brake combo. Went to purchase online today and to my surprise there were no such parts listed for the XRs. I saw plenty of CRF/CRF-X choices and they seem to differ depending on generation. Obviously I can use nearly any perch/clutch combo as long as the two match; but I was wondering if anyone knew which of these levers was closest to stock? Also, will the first gen CRF250X brake lever work on the XR? These may be stupid questions to some; but I'd rather ask a dumb question than drop money on an ASV brake lever I can't use. Thanks for any help.
      #xr250r#hondaxr  
       
       

    • By TheLastByte
      Im currently in the market for an xr400r, and considering buying one that's had some heavy engine work done. The current owner claims to have bought it from a friend who's an XR enthusiast. The PO installed a big bore kit and high comp piston, as well as a xrs only pumper carb, rsw triple clamp, aftermarket clutch, street lights, and a whole bunch of bling.
       
      My main concern is the effect the upgrades will have on the engine's longevity. How much quicker will I be going through top ends with the setup on this bike as opposed to a stock setup, and should I be worrying at all about bottom end longevity as well? I wouldn't mind having to eventually redo the top end, but I don't want to deal with a race bike type top end rebuild schedule on an XR. 
      Is there anyone here who's running a bike similar to this one who can give some advice? 
    • By Ralph303
      I have a 2001 Honda XR400R. It has a whirring/grinding sound in the lower end and a vibration in the top end. I pulled the valve cover and everything looks good. Decompression lever looks to be in order. Anyone know where I should start looking or just rebuild the whole engine. Ballin on a budget, but really love this bike. It looks like it’s new otherwise. Oil was jet black and thin. Thanks in advance! 
    • By junglePIG
      Hi, I have an Xr250r with a buckled/ wobbling front wheel, after trying to true the rim i have broken a spoke.
      I am wondering if it is possible to lace any 36 hole aftermarket rim to the oem hub, also will i need to buy an xr250r specific spoke set. also could i take a 36 hole rim from another front wheel and lace that up???? thanks
×