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Post by kevrd200 on Oct 25, 2021 23:45:14 GMT 1
hi all do microns need jetting on my 200 running standard air box as the plugs look spot on ? i was thinking of putting some k&ns on or similer will they need jetting ? cheers
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Post by kevrd200 on Oct 27, 2021 23:38:01 GMT 1
any info ect ?
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Post by midlifecrisisrd on Oct 28, 2021 8:49:11 GMT 1
Going to K&N is usually a load of sizes up on the main and at least one on the pilot
Add 100 and see how it is
No experience of the 200 I'm afraid
Steve
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Post by steve63 on Oct 28, 2021 13:04:52 GMT 1
Many moons ago I had a 1977 RD200. I removed the air filter and left the airbox exactly as it was. I also removed the copper head gasket and used some sealer instead. Then I fitted some home made expansion chambers. I never jetted it up or changed the timing but it improved massively. The top end was up by over 10mph and acceleration was a lot better. It got thrashed without mercy and never blew up or holed a piston. At one point I ran an old Torque Induction 200 engine in an AS3 with no filter and had no problems. Saying all that I probably wouldn't do the same today as I think about things now  My theory is that they were jetted quite generously from the factory. In other words well on the safe side. This allowed for a lot of ham fisted mods by young idiots such as myself without making the mixture too weak. My advice is Microns should be OK but K&N's will probably be a bridge too far. I seem to remember other lads messing about with K&N's and never getting the 125 or 200 to run properly. Maybe the lack of parts for the 125/200 carbs and certainly the lack of knowledge |
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Post by Robbieben on Oct 28, 2021 13:46:10 GMT 1
I seem to remember other lads messing about with K&N's and never getting the 125 or 200 to run properly. Maybe the lack of parts for the 125/200 carbs and certainly the lack of knowledge I've never found that 2 strokes run well with K & N type rigid filters but run perfectly well with a foam filter, the fact that the foam filter can absorb inlet resonance pulses rather than reflect them may be the reason but I've never flow tested both for comparison. |
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Post by tony2stroke on Oct 28, 2021 17:57:37 GMT 1
I have a fair bit of experience with the 200, you won't need to upjet for Microns, without the filter element you would need a 100 jet, you can use Dynojet or Keihin main jets in the TK carbs.
In my experience there was no power increase with Microns or allspeeds, the problem is the front downpipe is restrictive, I had some hydro formed expansion chambers made, what a difference that made, I went too far with mine and it was all or nothing, and had to be ridden over 7,000rpm for the power, it soon wears you out, be careful what you wish for.
If you want a massive hit of torque, without any downsides, fit 250LC carbs with pod filters using the 250LC manifolds and balance pipe (the filters need to be set back same as on the 250LC) you will need to change main jet to suite (sorry I can't remember the jet I ended up at) if you just want the extra torque without changing where the power comes in, this is the best bang for buck mod I did to the bike.
I recommended this mod to a guy who put the 200 engine in a kit car, you can read about some of this on the aircooledrdclub
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Post by copper99 on Oct 28, 2021 21:34:01 GMT 1
Get it up to Mick Abbey for a set of his pipes...   |
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Post by steve63 on Oct 28, 2021 22:43:51 GMT 1
A 30hp RD200 would be an interesting ride to say the least. I would think mine had something like 20hp and the front wheel liked being up in the air all the time.
My expansion chambers cut the power quite abruptly at about 9,000. The original pipes I copied off my mates bike made it rev on and on to more than 10,000 so I can't have done a great job of copying the dimensions but mine probably worked better.
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