Advice on running in after rebuild.....

[swampy]

Hey folks, I'm in the process of rebuilding the top end of my NSR. Could you knowledgable people out there throw me any advice on running it in when done ? I.e max revs, how many kms, varying the revs etc....
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"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson

[tatters]

when you first start the bike let it warm up for a few mins before riding off.


keep below 5,000-6,000 revs for the first 50 miles

then keep below 8,000 revs up till 100 miles, at that point check the toruqe of your cyclinder head bolts. and ride normaly



the trick with two-strokes is not to run them in too easy or too hard, to softly and you will vanshis the bore and soften the rings, too hard and the piston might seize.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[mr jamez]

Honda's recommended running in period is regarded as a bit soft, the above post is what a lot of people recommend, I will be doing it anyway when I get round to riding the NSR

[ProXimaCore]

When I got my NSR rebuilt I was advised to do 300 miles under 5000rpm. It was a pain in the @rse but I done it.
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Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[Ian (GPX)]

As a rule, NS / NSR lumps need to do around 150 - 200 miles once rebuilt @ 5500 rpm and not over 6500 rpm, don't want to have to rebuild it after 400 miles.

[cagiva gezzer]

A couple of heat cycles once its all together. The first couple of times a piston is heated the expansion is relatively large. Getting a couple of heat cycles done at idle(ish) makes sure these expansions don't cause too much hassle. I normally do them while bleeding the oil tank.

Some people say to run it on premix, nut this leans out the jetting.

500km at half max revs, then every 100km take it up by 1000rpm.

No holding a steady revs and no labouring the engine. You can take it right up through the rev range, just don't hold it there or do it too often.
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"because one stroke isnt enough and four strokes waste two"

[tatters]

both: cagiva gezzer and Ian (GPX) methods


are way too soft for runing a two-stroke in, and performance may suffer. my stated method is what the old boys always say too me and l,ll rather go with guys who have had over 30 years of experance with two strokes than what honda, yamaha etc say any day.




do not run the bike on premix, or any extra oil

work the bike in every gear up to the 50 and 100 mile marks, do not sit at a steady speed work the engine within the allowed revs.
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Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[Ian (GPX)]

Yamaha / Honda etc ! I'd say that they would know better due to the fact that they developed the engine in the 1st place or is R&D redundent now ?

[tatters]

[Frost]

Manufacturers generally give overkill run in recommendations to cover their backs.

Look what racers do, they put it together and thrash it round the isle of mann. If they get more than half way round then the engine will do just fine. no running in, no premix just a damn good thrashing.

Just do 100 miles out of the powerband (gradually increasing towards the powerband as you get closer to 100 miles) thenincrease towards redline over the next 100.

Run on premix initially as the system won't have much oil in it. after the first tank full or so theres no need to use it again.

When you first start it up, a little premix in the cylinder will help, as will lubing all parts with 2 stroke oil during assembley

[swampy]

Cheers for the advice guys, I'll bear it in mind. For some reason I thought the run in period was much longer, but it seems I should be able to do it with a weeks gentle commute to work....
____________________
"I hate to advocate drugs, alcohol, violence or insanity to anyone, but they've always worked for me." Hunter S Thompson
"Faster, faster, faster, until the thrill of speed overcomes the fear of death..." Hunter S Thompson