carb issues

[Jester]

I have a stock carb on my R right now, an am beginning to have (what I think are) issues with it, so I was looking to rebuild it, and most said its not worth the money.

Now, my question is, what is a good stock replacement? where can I get it, and what will I need to make it work.

My riding is all trails, so I'm going for bottom to mid, but I also ride 6th tapped sometimes too, so keep that in mind on your reccomendations.


I'm also having an issue that some might be able to help with. I find it a real problem to shift into 6th. By that I mean it feels like I don't have enough engine to pull it. If I tap out, and I mean really wind it tight in 5th I can keep it in 6th, but accelerating from there is really hard. I have checked the bore with a bore guage, and its within spec of the piston, and the rings are brand new. Reeds looked fine. It is a stock cyl on its last 2nd to last bore, stock head, gold series pipe, and fmf pipe (power core I think), Jansen coil with the plug gapped to the book spec. Its an 86 rod and piston.

If runs fine in all other gears and pulls fine, which leads me to believe that the jetting is ok, could I just blame that on the old carb too?

[wilkin250r]

You have an 86 rod and piston, that leads my to believe your tranny is also an 86, with the taller 6th gear.

In stock form, they just didn't have the power to pull 6th gear all the way out.

[Jester]

well, that explains that..


now about a replacement carb?

[matt250r21]

For low and mid I would go with a 35mm Kehin pwk airstriker or older 36 PJ Kehin of any CR 125. For MX I run a 38 pwk airstriker.

[dynofox]

Originally posted by matt250r21
For low and mid I would go with a 35mm Kehin pwk airstriker or older 36 PJ Kehin of any CR 125. For MX I run a 38 pwk airstriker.

I just bought a 35mm airstriker for my 250r, I do the same type of riding you do so I'm hoping it works well. My R is all stock other than an uni air filter and boyesen pro series reeds. My PJ is junk too, that is why I upgraded. Can't wait to try it out, should work nice! :D

[350rpowervalve]

pwk 38mm without the top on the airbox ... i have an 44.5mm on my 350r ...

[zedicus00]

bigger doesnt hurt, i run a 35 pwk on my girls blaster, with a custom filter kit... got a 40mm on my 303 cc 250r...

[readybeartoe]

If you decide to get a 38mm Airstryker you will like it! I have them on my R's for MX. The jets that come with it is just for references though and most of the time way too rich anyway. So Keep that in mind. Have a jet kit ready to experiment with. Also the airbox boot will give you a little trouble if you do not heat it up with a hair dryer to strectch it over the intake on the carb. :chinese:

[Jester]

where do you reccomend getting the 38 AS?

[readybeartoe]

Ebay is much cheaper than new. Going for about $150. just be pacient and you might get lucky and get it even cheaper on there. Or if you want to order a new one just look in the Magazines. You'll pay a little over $200 for a new one though.

[zedicus00]

a newer kx250 carb is a 38 a/s carb. they can be made to work one a 250r. they go pretty cheap on ebay. be prepared to put a couple hours work into it though.

its also shorter bodied carb so it fits really good if yur using reed spacers or sumthin.

[readybeartoe]

I forgot to tell you if get a 38mm A/S , you will need a new throtle cable because the stock WON'T WORK. $14 bucks. :)

[d33pt]

I got a 38mm Mikuni for sale on ebay if anyone's interested. Comes with the throttle and cable too. Only $10 so far.

link (http://cgi.ebay.com/ebaymotors/1986-Honda-TRX-250R-38mm-Mikuni-Carb-Twist-Throttle_W0QQcmdZViewItemQQcategoryZ43979QQitemZ46 10995582QQrdZ1QQsspagenameZWDVW)

stupid ebay, can't figure out how to link it right. Search item#4610995582