ahamayfrank

All, I have somewhat recently purchased a 2005 SY250 2T with a Yamaha engine and very little use. It has the original tires. They are in good shape but seem a bit hard. What a sweet bike and I wish I had tried one earlier. I had a 250F that I liked but this bike is far superior for me. So I would like to replace the rear fender or mudgaurd, but I have been told that they are no longer available and the "New Scorpa" owners will not support the older models with parts. Is there a preferred source for Scorpa parts that may be able to supply items that are also willing to ship to the US? What do the Scorpa/Yamaha faithful know about this situation? My bike has a white rear fender but I certainly could get used to blue, if I can source a blue one. Thanks a bunch, Frank

I have a US model 1977 TY250D that I am quite pleased with overall. I have an intermittent ignition issue that I believe would be cured with replacement of the points and condenser, However I am looking for a good excuse to upgrade to an electronic ignition. I have already spent a bundle on it, so why not? I have read through a good bit of information after searching this site but I would like to stimulate some new discussion if folks here care to share experiences. I have seen three systems that are similar in price that appear to be available for my TY. Do other posters have experience with these or other systems. Electrexworld, tytrials, yamaha-majesty? Inquiring minds want to know. Thanks, Frank

We were up at Trials Training Center for the last STRA Trial of the season. Nice weekend! Brad B. had a 2011 Scorpa that he rode the event with and he asked if I would like to ride it. I just stayed in the field and rode the logs, rocks, and whatever those cement things are. I really liked the bike. I have a 2009 Sherco Economy 2.9, so I adapted to it easily. I would guess that the motor is almost the same but it was a bit more snappy on the bottom and had a real nice intake growl and a slightly different exhaust note. It seemed easier to balance and the steering could be turned farther than any bike I have owned. Maybe that is why I could balance better. The front fork was very smooth and it was easier to hop for me. Both the front and rear were more active and the bike rode higher in the travel than my Sherco. I don't know if it has more ground clearance or if it just feels that way because because of this. When zapping up onto something it was easier for me to get the rear up on the obstacle. Clutch was very predictable just like my Sherco and the brakes were stronger at both ends. I have always wished for just a bit more front brake and the Scorpa has it. (But the grips would have to go). I have always been impressed with the part quality and fit and finish of the Scorpas. This one looks to be the same build quality unit. When someone gets one and can take it apart and put it back together, we will know. I wish I had the funds to give one a more permenant try, but! I think this would be a good bike for me!! Frank Oh Ya, I am a "Mid Pack" at best Advanced rider. so take my opinion, for what it is worth.

I know this thread has been dead for quite a while, but I finally got off my a*** and created a on-line photo account. So: Before (as purchased) and After a couple of weeks in the "Man Cave" almost a year later Still more to do but it works quite well so far. Frank

Guy, When I got my TY it already had the longer rear shocks and progressive springs (dual rate) in the forks. I was still fiddling with the front forks when I moved the rear upper shock mount so I can

I think both ages apply here. When my

http://xlforum.net/photopost/data/500/1977_TY250D_RH.jpg I tried attaching the above photo, but it is not allowed. If you are curious I guess you will need to endure a bit of a "Sportster" site. Spent a few weeks in the "Man Cave" and this is what came out. I am pretty happy with the result!! Frank P.S. New rear spring rate for the relocation, engine rebuild still at 250cc with fresh parts, paint here and there, and alot of love. Two trials on the maiden voyage to "bike week" were a success. Suspension much smoother acting and the engine is much crisper (flywheel, airbox, compression). Front rides a bit high but a great start. Tuning to continue!!

Guy, I am not to be considered an expert on any of this, but I will tell you what I know, what I have learned, here as well as searching the internet, what I have discovered today, and my opinion. I have not seen any Majesty bikes here in the SE US either, and trials riding in general is not very popular, so this site

Thank's BD, I am headed to the shed with a pencil and a beer! Frank

David, Thanks for the tip about the Majesty article. I have visited the tytrials site before but it is not extremely user friendly for me, so I never found the article. I have made some copies and I am going to see if the numbers make sense, as you suggest. Well into the adult beverages now having a day off and the rain still falling so should be a good evening for it. We have been having pretty typical UK weather a lot lately, if the rumors are true, so I should have some time in the bike shed tomorrow. I have been searching around the internet and found some additional photos including the ones here from oldtrialsfanatic and bodrinker with bikes with repositioned shocks. These two and the one in the article photos all have the swing arm lower shock mount farther rearward than the one on my TY. There are a number of photos modded TYs of different displacements (on the mijossi site for example) and quite a few different shock positions. Some have bracing at the top mount as Woody suggested and some don

I don

David and Woody, Wow you guys are really into this. Great information!! Trials in the US and especially Twin Shock Trials is not popular at all. We have a few old farts (myself included) that seem to be the core, riding modern and vintage bikes, but still a very, very small sport here in the southeast US. I worked at a Yamaha dealer in 1977 so the TY250D may be the first Trials bike I ever rode so thus my choice. I would like to use mostly Yamaha parts but get my bike to work as good as I can so a full Majesty mod is not what I am interested in. Well I may actually be interested, but he frame prices I have seen are quite high. Honestly I have only started to understand the history of the

David, Thanks so much for the info, and very quickly too. Just got to work so need to actually work, but I

This is my first post in the Yamaha section, just a lurker up to this point I guess. Almost 2 years ago I purchased a 1977 TY250D US spec model. It had quite a few updates to it such as progressive fork springs, tapered head bearings, updated carb and exhaust, and Falcon shocks. I have been

Looks like the spherical bearing at the top and bottom of the shock is not available from Sherco. I looked here: http://www.shercousa.com/pdfs/sparebooksherco2002.pdf I would bet someone here knows another source though. Probably common with another shock brand? Frank

I would get a quote from both suppliers. Shipping internationally is not such a big deal these days. Also, the exchange rate between the UK and US may be favorable as well. e-mail is free! Frank

Laser1 If I were buying this new GG, I would wait until I had the bike to decide what to do with the rear tube type wheel set up. Here

Neo, From what I have read on line it is pretty common to recondition coated cylinders that have been damaged, in the MX world. It is also possible to increase the displacement of many 2 and 4-strokes by removing plating, boring oversize, re-plating, and fitting a larger piston. A few years back I had the displacement of my Yamaha YZ125 upped to 144cc by Eric Gorr. If I remember correctly the bore was increased from 54mm to 58mm using the stock cylinder, and a commonly available aftermarket piston. This engine also has variable exhaust port timing (complicating the modification) so the power valves needed to be cut to fit the new cylinder size. This wouldn

fastducs, I have owned a couple YZ250Fs, 1 WR250F, and 1 SY250F and am a self-proclaimed expert on some of the above (just kidding). I have been in the clutch of these models and I also have opinions, so maybe I can help you finding the information you are looking for. I could type all I know and still not answer your question

Lee, It is possible to remove the carb without taking off any of the exhaust. Remove the

If you are really thrifty, willing to "fabricate" some type of bracket, and have an unused desktop computer around, there is a good chance the fan is 12 volt. At least they can be on this side of the pond!! Frank

Jorge, Is the coil symetrical and do you have long enough wires to flip the coil over? As Stork said this will change the ignition timing and you can verify it with a timing light. Let us know what you find out. Frank

MSRP for a 2009 Sherco 290 in the US is $7350 the Economy 2009 / 2005 is MSRP of $5200 so how can that not be considered a Great Deal!! Over $2K difference is a lot of imported cheese. Back in 2005 I would have to assume that this was a competitive bike, even in the upper classes. Many folks at the local level still ride units that are 2005 or older, but they were new in 2005 and by now have a good bit of time on them. Yet these riders are still very competitive in their respective classes. I would think that if you could buy a new 2005 Sherco 290 now that it would be worth $5200 in competition dollars. Of course the resale of an almost new 2005 would be lower, but I would think you get my point. Nothing like a new bike. With my limited research experience I searched around on

I am half scared to respond in the Scorpa Forum, but the Bad Mood Beta guys have stayed away so far in this thread. Not sure why some are so grumpy, or dislike Scorpas so much, but! I too have an Athena 290cc kit installed on my SY250F. My findings are similar also with the power increase. Much better low end but I feel some boost all the way up through the rpm range. Looking at the parts CD you can see that the stock setup uses 2 base gaskets and mine had 2 also when I disassembled it. According to the Athena information the compression ratio is the same as stock with the 290cc kit so I installed 2 base gaskets when I reassembled mine. I cannot detect any change in compression braking, starting, or any increased stalling. As a side note, after learning to always apply a bit of throttle when catching your balance with the clutch when stopped, I stall the engine very, very infrequently with 250 or 290cc. I changed to the 2008 carb at the same time and increased the pilot jet one size and like to run the fuel screw at 2 turns out at normal temps. Another advantage to the Athena kit is better cooling. I feel the bike runs a good bit cooler with the increased water jacket size. I think all the 4-strokes run warmly, so this was an unexpected plus! I also have a Mitani Titanium head pipe. I ordered it from a dealer in the UK and with the favorable US exchange rate it ended up just a few $ less than a stock one. It came with a Carbon Fiber heat shield that is very fragile (looks cool though) and the shield mount brackets are thin so can bend easily when hot. I put my stock heat shield back on and carefully selected the mount bolt length to assist the flimsy brackets in supporting the shield. Love the bike. Frank