The ATC 200 is equipped with the Honda Easy Start System. and the carburetor is a 22 mm piston valve Keihin. Today KPMI® proudly offers complete high performance lightweight valve spring kits for a host of applications. The ATC 200 has a little more torque, a longer wheelbase and larger wheels than the similar ATC 185 model, as Honda produced this to be used not just as a sport vehicle, but to be versatile enough for use in agriculture as well. In fact, these innovative high performance lightweight valve spring kits, would not only outperform factory parts, but outlive them as well.Įach KPMI® spring kit is designed for its specific application, taking into account several critical parameters including cam profiles, harmonics, natural frequency of the springs, valvetrain mass, required pressure, wire stress, fatigue life, and engine rpm, just to name a few! Working together as a team enabled KPMI® to evolve with a "unified system" approach. Nicecnc Replacement Intake Exhaust Valves Kit Set For Honda Atc185 1980 Atc185s 1981-1983 Trx200 1984 Atc200x 1983-1985, Find Complete Details about. It was apparent early on that an OEM style spring with a bit more pressure was not going to be the complete answer for these engines. This task would require the concentrated efforts of every member of KPMI®'s design team. The challenge to engineer a valvetrain that would outperform OEM systems, that in some cases included titanium components, was not an easy one. This innovative ability has never been more apparent than with the development of the high tech lightweight racing valve spring kits for the incredibly stressed and torturous environment in today's high revving 4-stroke engines. Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. You may also want to give Mickey of Four Stroke Tech a call () and see what he says as far as mods for a 185s. A 200x stroker complete swap (you send them your crank, they modify it and send it back with new bearings and other things) will run about $500 just by itself. Their customer service is an abomination, but if you call repeatedly ( I try once every hour) then you should be able to reach them and talk about a 185s motor stroker. Look them up and call them if you're interested. I got my stroker from Powroll Performance in Oregon. However, if Honda made the stroke shorter on the 185s, then the powroll stroker is not an option as far as I am concerned. If the stroke on the 185s is the same but they just made it a smaller bore than you should be good to go in that direction. I'm not sure as to whether the same mods will work on the 185s. I have a 212cc stock bore stroked motor that started as a 192cc 200x motor. The bottom of the piston is shaved so that it will clear the crank. Now though, the piston is going 6mm further down than stock (3mm from crank, 3mm from rod). So, now the stroker goes up 3mm but the rod accounts for the 3mm and the piston goes into the same place at TDC. So, they (powroll) heat up the con rod and squish it down 3mm. BUT, if you had 3 up extra, the piston would crash into the head/valves. The crank pin is moved out 3mm so that you get 3 up and 3 down more. Strokers on these bikes are called squash-rod strokers. Im sorry if Im asking for a lot here but I really wanna make this a good build, so if you have any similar builds could you please provide a link to your thread, so I can read it over? Thanks everyone ! How well will the stock crank handle these mods ? Ive had a 185 with a 12:1 piston in it, the stock crank held up well for a few months then I sold it, and never found out how long it lasted What type of valves/springs/guides did you go with ? Is kibble white a good brand? What type of exhaust system do you have? Is there any other good system besides DG? Has anyone bought a web cam? if so which one did you go with and how do you like it? did it make a big difference in power deilvery? Has anyone bought Barnett clutches? Did you like them? how was the power delivery ? ect. Personally I found that a good carb and head set up really brings them alive. Ive been reading around on threats and craigslist looking at what other people have done along with what I have done in the past years. I already have a stock 200s top end on it and id really like to get a lot more power from it. Im looking to build the hell out of my 185s, its kind of a bucket list thing for me.
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