260 tbx bms 2013 By 27yankees (Read 3,314 times)

[steve]

So here is my tech question. I have Scrappydogs 30mm performance carb on my Ice Bear Viking 150cc engine and am very pleased with the way it performs. I would like to install the same carb on my Bobber. It has a 229cc Honda clone engine. Will I need to re-jet up?

[JR]

More than likely not. IMO a 30mm carb on a 150cc anything is just over kill. reason? The intake ports and manifold are made to fit a 24mm carb. Most of the time one has to down jet a 30mm carb to function correctly when fitted to a 150 head? ,Just as easy to up jet a 24mm carb?

Think of it like this. You have a 3" pipe with water flowing through it then you reduce the pipe for the last foot to 1". All the water you will now get is what will flow through the ID of the 1" pipe, it's that simple. So if all you wanted was the flow that a 1" pipe will give why put in any 3" pipe to start with?

JR

[steve]

Thanks, JR! Only did the 30mm on the trike to upgrade to a pumper and better quality. Used his kit with the manifold included. It really made a difference for me. Not so much in power, but it seemed to eliminate the mid range flat spot the other had. Would have gone with a 24mm if he had one.

As I understand it, most versions of this bobber come with a 24mm pumper that need to be rejetted. The springer is suposed to be 30mm pumper with manual choke already, but I have been impressed with the quality of Scrappy's carb. It's most likely a waste of money, but to me, a balance between intake, ignition, and exhaust are the heart of the matter. I leave the block alone. I always try to upgrade the carb, CDI, fuel pump/filter, and coil to the best quality I can afford. I usually gain a little performance, If you change the oil when you should and don't over rev, the block will not be what fails on the road. The Chinese clones are pretty much just nice, affordable rides so trying to squeeze every last drop and power out of one would probably cost what a good used japanese bike or even old Sportster would. Of course there is the fun factor and challange of trying to hot rod the clones and mistakes don't cost as much.

[steve]

Hey, I just reread the part about the reduction in port size and this thought comes to mind. When you reduce the diameter of the "pipe" from 3" to 1" and the input pressure remains the same, the venturi effect comes into play like putting a nozzle on a hose. I wonder if the increase in pressure and speed has any effect, good or bad, on performance? That would assume that a manifold that adapts the two diameters is used rather than a direct bolt on where turbulance is created at the intake port. First guess is that it might lean out some?

[steve]

Since this thread seems to wander a bit, I thought I would post this graph of unmodified production top speed motorcycles from Wickpedia. I was wondering what motorcycles that used springer front ends were running as average speeds before the advent of oil filled forks and found this. Notice the dramatic increase between about 1910 and 1915? Those must have been such exciting times for bikers! Although bobbers did not become popular till after WWII, that may be why I like that vintage look so much.

[mspctech2000]

I got my 2012 tbx 260 from .bobcatsmotorsports.com/BMS_260cc_Scooter_TBX_260_EFI_p/bms%20tbx-260%20scooter.htm" rel="nofollow" target="_blank">.bobcatsmotorsports.com/BMS_260cc_Scooter_TBX_260_EFI_p/bms%20tbx-260%20scooter.htm in April.
After all of the horror stories, I've heard about online purchases, I'm glad I ended up purchasing from them. The whole purchasing process was spelled out on the site. There were no surprises and bike arrived in excellent condition and the mco arrived shortly after. They return your calls and emails with any questions before and after the sale. I'm big on customer service and can be hard to please, but believe in giving props when due. BMS really surprised me with their willingness to help with any questions as well.

Beth assisted me with my transaction. I think they only have a few colors left. Don't know what you're looking for. I called them before I placed my online order to insure my first choice (white) was available.

My only complaint was with the trucking company. One driver and not very experienced in getting something that size off the truck. Luckily my friend who is a very experienced trucker was there to help him unload it.

My first year riding has been great and i look forward to Spring!

Ask any questions you have and I'll try to answer. Though I haven't had any problems to comment on yet. Yay! (Except a stripped screw and a lost license plate.) Don't ask...lol

[steve]

Thanks for that info. I, of course, got side tracked by the little bobber. Still think that in that price range, the TBX EFI is one of the best values. I am looking forward to the design changes this spring.

[steve]

The new bobber arrived today. The build quality is very good and she looks good! I still have some minor adjustments to make to the clutch and such, but she starts easily and sounds great. I took her for a quick test ride. The ridgid frame and springer will take a little getting used to. It's so good to be back on a bike again. I'm very pleased so far. I've installed a P-pad and today the 32 Ford tail light will go on. I've ordered a couple of other cosmetic parts and already have the sprocket to switch from 45T to 38T.

If any readers live in the DFW area, my blue 2012 YY250T is for sale. I've already done the high flow fuel pump and filter, CDI, coil, and spark plug update. Less than 500 miles; all in town. Also has LED brake and tail lights. Think maybe a grand?

[scot]

glad your happy steve .thats what matters,well if i had not got my red one its a great price blue was my 2nd choise ,you will get that for the kinda miles i see guys selling the older 2008s for 1800, offer on ebay ,post some pics when you get a chance of the bobber

[trailheadmike]

Congrats and please keep the impressions and pictures coming.

[steve]

Will do. As is often the case with on-line vendors, I'm still waiting on the MSO, but I have ridden her a little. She needs the 38T sprocket for sure, but I'm very impressed so far. I've done the 32 Ford tail light and added a P-pad. P-pad is cosmetic only, because this a one rider machine. It sounds funky, but I took the bowl from a sink strainer, mounted a black spider to the center and used it for a horn cover. If you're into bikes at all, this unit, for about the same price as a 250cc scooter, is something to look at. I forgot the most important part. No plastic. Even the fender is steel. She has a skinny 21" tire in front and fat 18" on back - both tubeless and mounted on chrome spokes with black rims. Do I sound excited? I'm working 7 days due to a system failure at work, but I'll try to get pictures as soon as I can.