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Old 05-30-2013, 08:16 AM   #8206
elsalvadorklr
southern xr rider
 
Joined: Nov 2008
Location: Columbus, GA
Oddometer: 4,150
airguitar

I have enjoyed my cast 87 long skirt piston in my 88 engine now for a nice while and enjoy the quietness and great performance too...it also drinks no oil unless Im at wot all the time...

I have come to the conclusion that a good fcr carb or other type pumper carb(I like the simple non pumper flatslide) paired with some nice headers, portwork(dont need this unless you go high comp or cam) maybe and a nice flowing muffler is as good as most need engine wise to modify the xr...

My biggest investment so far has been suspension..both the shock and using usds now...some good brakes and a steering damper down the road would be as much as I would do to keep a long running and relaible bike...

you can go crazy on engine mods...but I think its not what the xr is about really...

I went back to stock, but mostly because Im selling the bike...which seems to be very soon!

my advice...
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Old 05-30-2013, 08:31 AM   #8207
elsalvadorklr
southern xr rider
 
Joined: Nov 2008
Location: Columbus, GA
Oddometer: 4,150
fcr40 thread and info

for those swithcing to fcrs:
http://www.thumpertalk.com/topic/995...esome-upgrade/
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Old 05-30-2013, 12:00 PM   #8208
martin.kryjom
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Quote:
Originally Posted by elsalvadorklr View Post
martin the issue is you never actually tune the carb you currently have

if you just plop on different carbs from different bikes you are going to end up shooting yourself!

from all this info you just put up all I can say is the fcr40 on the xr6 uses the ncvt needle...

it also needs to be tuned for your specific cam, exhaust etc...

you never did work on the tm38 from xrsonly did you?

the tm40 is a popular carb for the bigger xr650r it may work but whatever settings work on the xr650r will not likey work exactly the same as on the xr6 that is pretty basic info...

tough to help when you dont follow through
HI
I change for FCR as it was sold to me as prejetted for XR 600 R. I do not like throttle response of the mx flat side XR only carb.
Anyway. I make today plug test.
Bike starts , runs 20 s, then stoped, then is very very hard to start, like 20 min of kicking.
Then starts , stops and again.
WHen engine is cold, for some short time i have white smoke.
I took out the plug.
Is black as on the picture.
Looks like is too rich.
My set up for that carb is:
EMR needle
170 main jet
50 pilot jet
Fuel screw: 1 turn out
pilot air jet: 150 (1.5 turn out)
main air jet: 200

WHat to do?
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Old 05-30-2013, 01:59 PM   #8209
elsalvadorklr
southern xr rider
 
Joined: Nov 2008
Location: Columbus, GA
Oddometer: 4,150
martin did you read the thread link I posted?

you dont like throttle response because you never jet completely...or fully

no carb will be perfect if you do it this way

that emr needle is wrong you need the ncvt needle for the fcr carbs

good luck
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Old 05-30-2013, 02:00 PM   #8210
elsalvadorklr
southern xr rider
 
Joined: Nov 2008
Location: Columbus, GA
Oddometer: 4,150
Quote:
Originally Posted by martin.kryjom View Post


HI
I change for FCR as it was sold to me as prejetted for XR 600 R. I do not like throttle response of the mx flat side XR only carb.
Anyway. I make today plug test.
Bike starts , runs 20 s, then stoped, then is very very hard to start, like 20 min of kicking.
Then starts , stops and again.
WHen engine is cold, for some short time i have white smoke.
I took out the plug.
Is black as on the picture.
Looks like is too rich.
My set up for that carb is:
EMR needle
170 main jet
50 pilot jet
Fuel screw: 1 turn out
pilot air jet: 150 (1.5 turn out)
main air jet: 200

WHat to do?
white smoke?????????????????????????????????????? you got something else going on, maybe engine problems that are making you have CARB problems or carb like issues...

why white smoke?
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Old 05-30-2013, 02:21 PM   #8211
martin.kryjom
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Oddometer: 50
This what im afraid of, but i have paid XR only for all new engine, I know that they sucks sometimes , but i think they have a lot of expirience and they bulid the engine in proper way...I paid 3,5 k USD + 2k USD for shipment and Duties, i hope that i did not throw that money... I did it in XRonly as in EUROPE in 90's honda was not so popular, and XR only has a great background, may be i made a wrong decision:(

Is only when engine is cold, until it reach around 30 C temperature.
I heard it is quite normal...
Or may be i should check something?

What to do?????
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Old 05-30-2013, 02:30 PM   #8212
elsalvadorklr
southern xr rider
 
Joined: Nov 2008
Location: Columbus, GA
Oddometer: 4,150
hmmm well maybe there is water in the oil after shutdown but anyways might be more normal in real cold weather dont know really

dont know what to say...

read some more about the fcr carb I linked the complete way to adapt he fcr to your bike...

I dont know who told you it came prejetted but maybe you need to read a bit more and see if you have everything setup

the link I provided has been tested using oxygen co2 sensors with air fuel graphs so that is why I say the needle you are using is wrong...

good luck
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Old 05-30-2013, 02:37 PM   #8213
martin.kryjom
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Oddometer: 50
What about plug, it shows that is too rich?
May be smaller PJ would help?
I see that im in much different spec then from the link u have sent.
Main jest i have 170, they use 158
PJ i have 50 they use 42. But it looks like they have notrmal engine, no big bore.
White smoke can indicate piston rings damage, is there any other indication of piston ring damage?
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Old 05-30-2013, 02:41 PM   #8214
elsalvadorklr
southern xr rider
 
Joined: Nov 2008
Location: Columbus, GA
Oddometer: 4,150
you have 2 issues you need to fix

white smoke

then jetting

the reason you might be having all these problems is because you have some piston rings issues

maybe look for posts about similar issues that you have...

I dont think xrsonly did a good job with your bike

also big bore jetting changes minimally

its when you start modding cams and intakes and timing etc...that big changes occure but even then only a few sized here and there not major like you have
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Old 05-30-2013, 03:50 PM   #8215
martin.kryjom
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I think problem is found and XR only did good job, i just fucked all up.
I write it for others now , i get the lesson .
Some time ago, around january i have posted on this forum that i have found that my frame after sanding it is full of sand and metal parts.
I have cleaned it out, most of it. However some of the send left and i put all bike together ( MY MISTAKE)
The frame was rubish, i should never do it.
Now the send get intoo the oil and inside to th eengine and distroy piston rings and piston itself ( propablly)
I took oil off the engine 10 min ago, and the plugs ( magnetic plugs ) where full of metal dirt, like from the sending. Magnetic plug from the engine has melted metal on it, what indicates that that dirt come intoo engine somehow.
I made a call to XR only, i say about white smoke, and the 1st question was" DID U SEND THE FRAME BEFORE???"


Now my 2 years project, saving money, lot of work is rubish.
Engine needs to be done again, frame is rubish. It needs another 2-4 k USD to finihs it and i think i will give up. Im stupid , i should never put that engine to that frame, it was done, i should buy new frame and starts all over again.
Now if i wonna XR to run i need to buy not only frame but also engine.
So no good and so sad:(
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Old 05-30-2013, 04:36 PM   #8216
Royal Club
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finally got my 6dollah china yellow color h4 bulb awesome oldskool look! I'll take a pic when I can stop somewhere in the dark.. My neighbours won't appreciate it if I kick the piggy over at this time..
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Old 05-30-2013, 04:40 PM   #8217
mcma111
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Location: San Francisco,Ca.
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What? At 3:30 in the afternoon???

Some neighbors.
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BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 05-30-2013, 05:23 PM   #8218
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its 1:23 AM here buddy
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Old 05-30-2013, 05:57 PM   #8219
mcma111
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Go start that bitch.
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BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 06-02-2013, 09:31 AM   #8220
The Dogger
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Joined: Dec 2011
Location: Great Britain
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Quote:
Originally Posted by martin.kryjom View Post
Now my 2 years project, saving money, lot of work is rubish.
Engine needs to be done again, frame is rubish. It needs another 2-4 k USD to finihs it and i think i will give up. Im stupid , i should never put that engine to that frame, it was done, i should buy new frame and starts all over again.
Now if i wonna XR to run i need to buy not only frame but also engine.
So no good and so sad:(
Don't give up now man !

Is there an engineering shop that could hone the cylinder for you ? Maybe a new piston , but no need to spend mega bucks ?

Then flush that frame out again ( and again , and again.....) Steve's Engine rebuild thread ( I think ) will show you how many times it needs to be done. Many , many times , but you can be doing that while your new best friend at the work shop sorts the engine out.

There are plenty of people on here who will help you get it back together again if you think the machinist is not familiar enough with this engine

The NCVT needle that you need is Honda part number 16234-MEN-671 . About 30 from David Silver Spares in the UK , I think they're about $10 in the US

Good luck , and do not give up. Report back with progress , we want to see this beast running.

Cheers
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