First Generation Ascots > The Thumper Years: Stock To Lightly Modified
exuast syatem
J6G1Z:
Here is a picture that I found on Facebook. From just looking at the picture, this FT has had new suspension & wheels put under it, rear-sets, plus a Sports-Bike canister muffler. I'll bet that it sounds nice, but the muffler looks too large compared to the bike.
J.
triguyracer:
Like what he or she did and I agree the muff looks a little big sure it flows enough lol.Think I will cut the spare set of head pipes I have right after they turn down at the head and remove the inner baffle and hang it back on the bike line everything up and weld it back together,have a bunch of offroad friends that have a slew of misc mufflers will see if I can get one that would work good and not be too loud,a friend offered a alloy supertrapp that's a bit banged up if its decent I will give it a try .Trying to keep the cost down right now.going for the easy stuff now like getting rid of weight.Would like to find a nice set of alloy wire wheels for the front and back,tempted to take the barnes wheels off one of my flattrackers,just cant afford another set right now lol.Looking for a set from a sreet bike or off road bike that wont be to hard to adapt or cost big bucks.Any suggestions?
J6G1Z:
The head pipes don't really have a baffle, they are twin-wall tubing for the length of the header pipes.
With a stock bike, I would be more concerned with doing the jetting & countershaft sprocket. Removing the intake snorkel will flow more air. The stock head pipes with an after-market muffler works well on a stock bike.
J.
triguyracer:
The things you mentioned I have already planed on will stay with the stock carb for now maybe a round slide in the future,right now I like the stock one and it works well and I think it will work well for what I want ,I have got a good handle on jetting as I raced tz250 and 350s for a number of years and was always jetting it depending on conditions so I feal with the recommendations in the posts I have read that it will put me in the ball park where I will be able to fine tune for the mild mods right now I plane to make.Reading thru the posts on the forum have helped me head in the right direction on somethings that would be hit and miss.Lotsa info in the forum to read
J6G1Z:
The stock carb is actually a fairly high quality part. It has an accelerator pump that is very helpful for priming the engine prior to a cold start. Every time you rotate the throttle it actuates the accelerator pump & squirts some raw fuel into the carb. The carb was just set too lean from the factory to pass USA emissions requirements. Changing the main & the low-speed jets to #145 & #58 will put you in the ballpark with a fairly stock bike using the air-box. If you replace the air-box with a UNI type of filter & a free flowing exhaust you will have a dead spot in the mid-range of the throttle. That's where I'm at with my hybrid FT Ascot. I need to experiment further.
Here is what I did to one of my FT Ascots: http://ascot500.com/index.php?topic=79.0
So far, the engine is still stock. I'm running the original twin-wall head-pipes with the EMGO reverse megaphone. Throttle response is very crisp except for my lean spot that I need to resolve. I'm thinking of just trying the next larger main jet.
Back to the stock carb. Some guys have replaced it with a 34mm or 36mm Mikuni & report excellent response. If you ever go this route, you need a special throttle cable with a 90 degree fitting on the end that connects to the top of the carb. This will help the cable clear the frame. White Brothers used to offer a 38mm carb kit, but I think that's too big for a standard bore & camshaft engine. There are several big bore kits out there for the XR/XL 500 family that will also work in the FT. Performance camshaft grinds are available, along with the option of having your camshaft fit for needle bearings.
How much do you want to spend? LOL!
If your FT Ascot is a real clean bike, you should consider leaving it as original as possible.
Good luck
J.
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