![]() This means that just because you buy Shell one day that had a true 91 octane rating, there is no guarantee that the next time you buy it or gas from Union 76, that the octane will be as high even though it says right there on the pump that it is. The exception to this is E85 corn gas which has a detonation resistance equivalent to around 100 octane regular gas but it has less energy than a comparable regular gas.Īt least some "production” gas has a very inconsistent octane rating. If you run increased timing AND increased compression like some do, you will positively need to run fuel with an octane rating of more than 91. If you increase your compression from stock you will likely need to run more than 91 octane. If you advance the timing you might have to increase your fuel octane. If you advance the timing you will likely need to increase your main jet size by 1 and raise the needle position by 1 if your bike is currently perfectly jetted which most are not. If the stock muffler is removed, increasing the timing 2 degrees will have a more noticeable effect than increasing it with a stock one, however you must increase the jetting size if the stock muffler is removed whether the timing is increased or not. It can be tricky business and can cost you a perfectly good top end if you don't get it right.Ī completely stock 250r is on the threshold of detonation with 91 octane in hot temps when ridden hard, therefore, increasing the timing will push it over the edge under these conditions which as ride-red 250r mentioned, may cause "issues" which are mainly piston related. I’ve said for a while the lineup of Honda three-wheelers is one of the smartest ones to buy cheap right now, given you can still find them at the occasional estate sale or local classifieds if you keep your eye out.But one thing I can tell you is, BE CAREFUL and know what you are doing when playing with your timing! I have not yet run adjustable timing on either of my R's to this point, but have seen where others sometimes have issues. Overall, that’s not stopping bidders who know how hard these are to find both due to the limited production and to so many examples being wrecked or otherwise damaged and rebuilt. The ignition switch is cracked, and there are some cosmetic blemishes to the plastic fairings. It’s all original except for a new front tire and replacement air cleaner. The seller of this example has found one of the very few 1986 models left that hasn’t been damaged or modified in any way. Incredibly, with the new engine and a six-speed transmission, the 250R was capable of a top speed north of 70 miles per hour. The popular Pro-Link suspension technology continued to be used, while front and rear suspension travel was increased to almost 10 inches. The 250R seen here was a monster (in the best way possible), equipped with a new, more powerful liquid cooled engine and a stronger frame. Honda eventually agreed to stop selling its three wheelers as a way to a quell the building firestorm, but not before releasing a high performance model for 1985/1986. ![]() Deaths and serious injuries resulting from roll-overs soon began to pile up, along with the lawsuits. ![]() It became obvious within short order that Honda’s dealer network wasn’t properly advising inexperienced riders and parents of children that the ATC wasn’t intended for rookie riders. ![]() The professional riders shown hurtling the ATCs into impressive drifts across sand dunes or dusty trailers were inspirational to the average rider, but the three wheeled Hondas weren’t the kind of vehicle that permitted amateur riders to look more talented than they were. When the promotional videos debuted for Honda’s ATC line, it was hard not to be tempted into ownership. Sales ended abruptly as lawsuits began to mount, and that makes survivor examples like this 1986 Honda ATC 250R here on eBay so collectible today. These ATVs were a way for Honda to make it through the winter season on something other than snowmobile sales, but there was a big problem: the bikes were intended for mature riders only, and dealers were selling these three-wheelers to everyone from kids to adults who couldn’t much drive a car correctly, let alone a high-powered three-wheeler. When it comes to vintage ATVs, Honda’s lineup of rowdy three-wheelers have earned a somewhat legendary reputation.
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