Recent content by lhaolpa

I think that the confusion comes from the fact that the bearing thickness is greater and the ID is less,thus the undersize. I would think that Yamaha would use established sizes of parts in a lot of similar sized bikes,with some having overly robust parts,others simply adequate.

If you have access to a micrometer,you can get the thickness,width and the size of the crankshaft and get a bearing from the interweb. You'll need to get an idea of clearance and allow for that. I once rebuilt an old engine that had bearings that had to be poured and machined for clearance. I...

Any GOOD automotive machine shop could measure the rod bearings and order some. A check with plastigage will tell you if they need to be replaced. Having said that,any time I open up the lower end of an engine,if I don't know better I replace all bearings and seals.

Been a while since I was on [illness and an old Fart].but you could take the rods to a machine shop if you could find one and have them checked for hairline cracks. You'll probably have to find a race car builder that actually builds engines rather than just throwing parts in. I have a '82 xs...

Auto parts stores should have the bearings based on the numbers,such as 6304,etc. They should have National and others. Get sealed bearings and maybe check an industrial supply for prices. Seals also have a number to use when finding alternative sources. VZX[I think that's right] sells quality...

Question: did you ever sort out your carb jetting probs? I would say,offhand,that you're too lean,thus the stumbling. The air screw should be set at around 1-1/2 turns,and a half turn in would indicate that you need a richer pilot. Maybe raising the needle would help as well. lha

I think the red color looks good,and sets off the calipre. The reason for molding the gusset area is that when using a different tank,sometimes the gusset is visible and kinda ugly. It's not a very complex task,just filling in the area which would be exposed by the difference of the tank. lha

Try BatteryGeek on Ebay. They have some maintenance free batteries that don't cost too much. lha

When covering a bike for storage,the tarp should be open at the bottom or You'll rust the bike due to trapped moisture. The amount of gas that disappeared would fill up the crankcase. lha

On option #1,if your regulator is working correctly,no amount of CCAs should burn your bike. CCAs are just a # for rating starting ability. In winter conditions,running a trickle charger will warm up the battery enough to crank the motor. The only way that a strong battery could burn anything is...

Sudco also sells carb holders as well as on Ebay,you can find some of them. lha

The VM carbs should work well on these bikes,as they've been used on 4-stroke bikes for years. You can't equate jet size with CCs,as a '73 At[125cc] has a 35 pilot,240 main,and a '73 Dt125 uses the same carb with a 22.5 pilot,and a 140 main. It's got a lot to do with slide setup,airflow,etc. Try...

Puet etre son les bougie que ne marche pas? lha

My At3,125cc uses a 230 main jet and 35 pilot,and by the way,the choke must be pushed down for on,up for off. It's a lever that lifts the enricher valve when pushed down. lha

I have a similar look in mind for my bike,and have the seat from a 1200 Yamaha that is similar,but more padding for my old butt. I have a large,wide tank from a 550 Yamaha[meant to be covered up by body plastic]. I've been buying various accessories from Ebay[good deals] for a while,and will use...