I posted these questions in the general repair forum, but didn't get any help.
Maybe some longer in the tooth riders hang around here and can help me.
I picked up an old DT175 for next to nothing yesterday. I think it's a '79, because the swingarm is still round, black tubing, and pictures I found of '80's all have retangular, silver swingarms. The guy I got it from has had it just sitting around for a few years and said he didn't know if the oil injector pump works, so put premix in the tank (while there's still oil in the injector tank). It's running pretty crappy, maybe because it has twice as much oil in the fuel as it should --- I don't know. I haven't checked the plug, air filter or anything else yet either.
Is there an easy way to check if the pump is working? If I pull the injector hose from the pump to the front of the carb won't it just let air in at the reed valve boot (and rev like mad)? If I simply drain the oil tank, then run premix without it having two oil sources, will that be fine, or will the pump them pump air into the intake? What about if I unhook the pump cable? Will that isolate the injector, or do I really need to plug something to do it right?
Also, all of my other old Yamys have had the frame serial number on the front tube between the triple trees. This one doesn't have a number there. My others have also had the engine serial number on a serated flat spot on the right case half, kind of above the kickstart. This DT has a flat spot there, but it isn't serated, and there's no number. Any ideas where they put the numbers on the 175s aroung that year?
I'm hoping to get it in good order for my daughter. She's really outgrown her XR100, but the newer bikes scare her because of the high saddles. I forgot how small full size enduro bikes used to be! She fits the DT great.
Maybe some longer in the tooth riders hang around here and can help me.
I picked up an old DT175 for next to nothing yesterday. I think it's a '79, because the swingarm is still round, black tubing, and pictures I found of '80's all have retangular, silver swingarms. The guy I got it from has had it just sitting around for a few years and said he didn't know if the oil injector pump works, so put premix in the tank (while there's still oil in the injector tank). It's running pretty crappy, maybe because it has twice as much oil in the fuel as it should --- I don't know. I haven't checked the plug, air filter or anything else yet either.
Is there an easy way to check if the pump is working? If I pull the injector hose from the pump to the front of the carb won't it just let air in at the reed valve boot (and rev like mad)? If I simply drain the oil tank, then run premix without it having two oil sources, will that be fine, or will the pump them pump air into the intake? What about if I unhook the pump cable? Will that isolate the injector, or do I really need to plug something to do it right?
Also, all of my other old Yamys have had the frame serial number on the front tube between the triple trees. This one doesn't have a number there. My others have also had the engine serial number on a serated flat spot on the right case half, kind of above the kickstart. This DT has a flat spot there, but it isn't serated, and there's no number. Any ideas where they put the numbers on the 175s aroung that year?
I'm hoping to get it in good order for my daughter. She's really outgrown her XR100, but the newer bikes scare her because of the high saddles. I forgot how small full size enduro bikes used to be! She fits the DT great.