Jordan Dillon
New member
I have a 250cc Dirt Bike, and to make a long story short, the timing chain went bad we think. They put a tensioner on it, and the chain got really hot from the engine, causing it to over tighten and go off timing maybe.
I need to buy a new one, preferably a heavier one, or made in the USA. (any chain will do though!). Here's what I need.
Chain pitch: 6mm. or 1/4
Chain width: 5mm. or .190
The chain on it now has 144 links, but that's not important, since we're getting a tool to add or take out links, so really anything in that size will do. Thanks in advanced!
I'd really rather not put the same chain it already has in there, cause some parts look cheap, but that would be better then nothing since we're getting rid of the tensioner. The year is 07 I'm pretty sure. It should be a "250cc OFF ROAD DIRT BIKE Motocross 4 Stroke Engine 19", so Motocross brand. They really dont say a make, but it's the only 250cc they have.
Bob A, thanks for the info! We're not actually getting rid of it, but rather making an auto tensioner (hand tighten) so it doesn't over tighten and stretch again. At the very least, we'll just modify the one on there. I don't see anywhere that sells the factory chain, or I might consider just buying that.
ducatisti: Thanks for the info. I guess I confused everyone by cutting the details down. Here's everything. My uncle owns a machine shop, and makes things for us like this all the time. Last week, we installed a new pinion bearing in my cars rear differential, so a job like this shouldn't be too much of a problem. He could make the chain he said, but the cost and time for something that small would be high, since he usually works with bigger parts.
The chain wore out because the metal expanded due to excess heat, then tightened, causing the bike to go out of tune, and somehow ruining the piston rings in the process. I'm not really sure if these two problems are related, but we already got new rings, and only need a chain. The tensioner they have on it isn't really good, and that's why we're replacing it.
I'm pretty sure everything on the sprocket survived with no wear, but I'll double check it to be 100% sure. It would be sad to buy a new chain and it do the same thing!
It
I need to buy a new one, preferably a heavier one, or made in the USA. (any chain will do though!). Here's what I need.
Chain pitch: 6mm. or 1/4
Chain width: 5mm. or .190
The chain on it now has 144 links, but that's not important, since we're getting a tool to add or take out links, so really anything in that size will do. Thanks in advanced!
I'd really rather not put the same chain it already has in there, cause some parts look cheap, but that would be better then nothing since we're getting rid of the tensioner. The year is 07 I'm pretty sure. It should be a "250cc OFF ROAD DIRT BIKE Motocross 4 Stroke Engine 19", so Motocross brand. They really dont say a make, but it's the only 250cc they have.
Bob A, thanks for the info! We're not actually getting rid of it, but rather making an auto tensioner (hand tighten) so it doesn't over tighten and stretch again. At the very least, we'll just modify the one on there. I don't see anywhere that sells the factory chain, or I might consider just buying that.
ducatisti: Thanks for the info. I guess I confused everyone by cutting the details down. Here's everything. My uncle owns a machine shop, and makes things for us like this all the time. Last week, we installed a new pinion bearing in my cars rear differential, so a job like this shouldn't be too much of a problem. He could make the chain he said, but the cost and time for something that small would be high, since he usually works with bigger parts.
The chain wore out because the metal expanded due to excess heat, then tightened, causing the bike to go out of tune, and somehow ruining the piston rings in the process. I'm not really sure if these two problems are related, but we already got new rings, and only need a chain. The tensioner they have on it isn't really good, and that's why we're replacing it.
I'm pretty sure everything on the sprocket survived with no wear, but I'll double check it to be 100% sure. It would be sad to buy a new chain and it do the same thing!
It