speed kits- is 60cc safer?

I am getting a 60cc kit for my tomos ttlx, i would like some opinions on if anyone thinks it is safer for your moped than a 70cc kit because the only ones i have ever heard of messing up is a 70. it is only 10 more cc's as opposed to 20, i think it's safe. also, i might just try to run the engine with a biturbo pipe and a amal carb with the stock cylinder. I have been told it won't work, has anyone tried this? i'd like to keep it 50cc's but i really do need to go faster as a part of my moped-mx project..... any opinions and comments are appreciated.

RE: speed kits- is 60cc safer?

dont bother getting the 60cc. it makes very little difference, and you would be wasting your money. Either get the 70cc, or leave your moped alone. I have a bore kit, and have had a couple problems, but the performance is worth it

RE: speed kits- is 60cc safer?

what problems did you have with your bore kit? What kind of moped do you ride? if yours is 2 speed like mine, how quickly does it shift to second. Also, I have a 27 tooth sprocket. do you know anyone with a 60cc kit or sonething, cause how do you know that they make only a little difference? Just wondering. Also, with the amal carb, are there any air filters that fit that from a car, because K&N filters are supposed to add horsepower to the engine because they have great airflow. Any ideas?

RE: speed kits- is 60cc safer?

i blew a main seal in my trans mission, which cost me a pretty penny to fix. Also, BE ABSOLUTELY SURE THE EXAUHST IS NOT LEAKING!!!!! otherwise the moped will run rough at top speeds, and you wont get the maxiumum performance out of it. I have the 27 tooth sprocket on mine right not, and can get the needle to back around to zero. i know that shifting often takes a second or two with tomos mopeds, and with the bore kit, it shifts in about half a second. I lost the aiffilter to my amal carb. I put a valve cover airfilter from pepboys on my carb instead, which provided better flow, but it did get in the way of the peddles, so i could peddle it, only kick it back to start it. However, it does look really cool. ill try to get pics of it. If you go to pep boys, they should have it, but youll have to enlarge the hole to fit it on the carb. i sincerely think that the performance i get from the kit is worth the little problems!

RE: speed kits- is 60cc safer?

where is the main seal in the transmission, and what is the purpose of it? (i want to know that so i know if and/or how the speed kit caused that) Did you do that repair yourself? How much was the main seal itself? and with the exhaust... do you have the clamp that comes with it holding the 2 pieces together? I saw one on a guide to assembling a speed kit and it didn't look like it would seal too well.... they welded it insead in the guide. And one final question... would the 70cc kit ever, in the most harsh conditions of use, possibly mess up the head& cylinder mounting studs? (the four bolts the cylinder and head mount to)

thanks dude

ride on!!!

RE: speed kits- is 60cc safer?

the main seal i beleive is what keeps the transmission oil from leaking into the crankcase. it was so much the seal, but the labor costs which was a lot. I consider myself highly skillled when it comes to working on mopeds, but i did not know where to get transmission parts, and i wasnt about to fool around with it, because there were so many little broken parts in it when i took it apart. The kit also managed to completely tear up my clutch pads. I t was proabaly only $50 in parts. The labor costs where close to $225. I probably should have just done it myself. I weled my pipe cause that clamp does jack shit. You can use a special steel epoxy that you can get at any hardware store. It is like a clay that you smoosh up, and when it dries, it is (suppossedly) as hard, and heat resistent as steal. Works great for me so far on other parts of my ped.I dont think the kit could do anything to the studs. The most costly thing that can happen is tearing up the cylinder head, by not breaking in the kit properly, and not using a high quality 2-stroke oil.

break in period does exactly what?

Would it be a good idea to break in the kit with a synthetinc 2 cycle oil, or a regular type 2 cycle oil? As i understand, the break in period is to put a bit of oil deposits on the cylinder and cylinder head to protect the metal.... A synthetic would leave less deposits though, right? I am just unclear on exactly what the break in period is for.

RE: break in period does exactly what?

Ron Brown /

Joel,

The break in period is to give the newly machined parts a chance to get to know each other better.

The finish on the machined parts has peaks which actually touch each other through the oil film when the parts are new. By running the machine gently, you allow these intefering parts to polish each other off slowly without generating enough heat to cause galling of the sufaces or even worse, seizing up.

The accepted norm for running in is to do everything gently. Never "lug" at low rpm and do not maintain high rpm for long periods. It is good to rev occasionally to "stretch" the internals so that you do not create wear ridges at the limits of travel which you will find, disastrously, when you do wind it up after the run in period.

On 4 cycles, dyno oil is usually recommended for running in, as synthetic is so good it keeps the rings from seating. I would assume this is the same for a two cycle.

The deposits on the cylinder and head are just byproducts of combustion and are irrelevant until they get too heavy, then you have to pull the head and clean them off.

Hope this helps,

Ron

RE: break in period does exactly what?

so i should use synthetic oil? And keep it at low rpms? what are the worst things that happen when it is not broken in properly? Is it possible to blow the piston if you don't break it in right? I heard of someone getting a 70cc kit and blowing the piston, could that happen from breaking it in wrong?

RE: break in period does exactly what?

Ron Brown /

Joel,

Read my post again, slowly and carefully.

I sugested NOT using synthetic for the run-in period.

I also described galling of metal and siezing as possible results of not running in correctly. Some would describe this as "blowing the piston" I suppose.

In addition, when you first get it running, warm it up then ride it for a minute or two, then check the spark plug for a light brown color. If the color is any lighter than that, don't ride until you increase the main jet, a lean mixture will make the engine run hot enough to seize and/or hole the piston.

Ron

RE: break in period does exactly what?

I agree about not using synthetic oil at first, what is happening is you are letting the rings (seat) in the cyclinder so by using a conventional oil the rings and barrel are actualy wearing in to each other creating a nice fit I recomend running about 1/2 to 3/4 throttle varying your speed so the rings dont get used to running at one speed hence seating in one area of the cyclinder more than an other run it like that for a couple hundred kms, vespa recomends 600kms but it will be fine as long as you have the carb jetted properly. After that I would run silkoline 2 stroke pre mix, I have had nothing but great success with it, this oil costs a little more but makes the engine last very well. Good luckRon Brown wrote:

>

> Joel,

>

> Read my post again, slowly and carefully.

>

> I sugested NOT using synthetic for the run-in period.

>

> I also described galling of metal and siezing as possible

> results of not running in correctly. Some would describe this

> as "blowing the piston" I suppose.

>

> In addition, when you first get it running, warm it up then

> ride it for a minute or two, then check the spark plug for a

> light brown color. If the color is any lighter than that,

> don't ride until you increase the main jet, a lean mixture will

> make the engine run hot enough to seize and/or hole the piston.

>

> Ron

RE: speed kits- is 60cc safer?

I would like to hear from people who have 60cc kits about how they are working for them, like an estimate on how long it takes to get to 35 mph and what their top speed is and if they have had any problems. Thanks.

RE: Installation 60/70cckits

I would like to kwow how difficult it is to install the 60/70cc kit? As a novice am I going to flounder and fail or is it something that you can accomplish with a bit of patience?

Thanks,

Armando

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