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anyoldiron
Sat May 28, 2016 12:38 am
Honda NS250F

Hello All

Picked this up yesterday, spent all day on it today, just about got it right. lt is a great ride, i immediately noticed a complete lack of vibrations in the handle bars. corners way better than any 2 strokes of the time. Makes my 350LC feel like a barge.  l have the fork seals left to do, i hate doing fork seals. as per usual l got some questions..............

1 how much fork oil in each fork

2, how do you check the 2 stroke oil pump adjustment? lts chucking a fair bit of oil, but i think that has got a lot to do with the PO, of years just started it up and rode it to the end of the block and back

3, how do you service the ATAC valve? l think its working, it pulls clean up to the red, and probably beyond,. When i took the ATAC valve cover off and before i cleaned it there is a ring of ''clean metal' where the butterfly valve would sit when fully closed, so im guessing it is working, i cleaned out all the crud with WD40 and a .22 barrel brush. Are there any points to lube in the system?

Cheers AOI

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Andy
Sat May 28, 2016 5:11 pm


Hello AOI, and welcome to NSR-WORLD! :)

What a cracking find! It looks really tidy!

I'm afraid there's virtually no info on the NS250 here, so you're a bit on your own unfortunately, but I'd love to see more of how you get on down the line.

Maybe try http://diffrentstrokers.com for some info, but please be sure to come back and post here too. It would be great to see more NS250 and NS400 stuff here.

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MarkR
Sun May 29, 2016 10:59 am
Re: Honda NS250F

Nice little bike! I like the look of the 250F, especially that swing arm.

The NS250 is similar to the NS400 in many respects, so the only advice I can offer is based on the 400

1 how much fork oil in each fork

Left - 348cm3
Right - 332cm3
Fork level - 120mm from the top of the tube (with the fork compressed - spring removed)
Oil type - ATF - Automatic transmission fluid

2, how do you check the 2 stroke oil pump adjustment? lts chucking a fair bit of oil, but i think that has got a lot to do with the PO, of years just started it up and rode it to the end of the block and back

The 400 oil pump us on the bottom crankcase between the exhausts for cylinders 1 & 3. At full throttle, a V on the pump control lever lines up with a mark on the crank case. The pump itself is non adjustable.

3, how do you service the ATAC valve? l think its working, it pulls clean up to the red, and probably beyond,. When i took the ATAC valve cover off and before i cleaned it there is a ring of ''clean metal' where the butterfly valve would sit when fully closed, so im guessing it is working, i cleaned out all the crud with WD40 and a .22 barrel brush. Are there any points to lube in the system?

If you managed to get the covers off, you've done well as the bolts generally shear in the valve body. As you say, the clean line suggests they are working. I'd be tempted to remove the complete unit and give it a good soak in degreaser or a soda solution (keep an eye on the external painted surface when using caustic solutions), followed by a clean. Again, based on the 400, the butterflies are operated via solenoid. The ATAC valves are open below 7500rpm and closed above. The RS and CR engines had crank driven ATAC. I'm guessing yours is the same as the 400 and if so, remove the linkage cover and solenoid. Then check for free movement of the linkage. The manual recommends Molybdenum disulfide grease for the linkage and rocker arm shaft[/quote]

HTH

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anyoldiron
Sun May 29, 2016 6:30 pm


Thanks for the welcome and info Mark, most helpful.

l now have it registered and insured, the sun was shining when i walked out of the insurance office yesterday morning, pissing down by the time i got home, and has been pissing down ever since.

lve been fettleing a little more, nice even plug colour, and the right colours at that, 132psi each pot. lm going to fiddle with the gearing a bit, so it tops out at about 105, 110mph its for the twistes if i want to go fast i have a axe for that,called a R1 ;) 

Will keep you posted

Cheers AOI

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actungbaby
Thu Jun 09, 2016 7:14 am


Hi whats it like as bike to ride around town . i have one thats bit of basket case keen to get at least engine
But toghter what i read the other day makes it sound like real hideous pig under 8000 rpm no go at all

http://www.motorcyclespecs.co.za/model/Honda/honda_ns250r%2085.htm

was on here i had second thoughts about it after that i never riden a two stroke roadbike
