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agigau_k
PostPosted: Sun Jun 17, 2007 1:03 pm  Reply with quote
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Does anyone know where I can find a good machine shop to bore out the cylinder on my 1971 Bajaj Vespa 150 (if thats what it is)?


I am thinking about redoing the cylinder with an over sized piston. My back head gasket was letting exhaust by and oil was draining down and leaking on the muffler and a lot of other parts so I took the engine apart. Supposedly my engine was rebuilt about 130 miles ago but when I look at the rusty stripped thread parts they sure don't look like it. Also, the guy who sold me the bike told me it was a rebuilt LML engine just like the Stella; I only see three ports on it. The last I read was the Stella engine is a 5 port engine.

I am pretty sure I didn't cause the back head gasket to blow out because I have only been able to go about 45 mph since I got the bike.


Last edited by agigau_k on Sun Jun 17, 2007 3:26 pm; edited 1 time in total
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Matty
PostPosted: Sun Jun 17, 2007 1:48 pm  Reply with quote
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Are you looking at the ports on the case or cylinder? Stellas are 3 port motors on the cases, 5 (sorta) in the cylinder. The only true 5 port is the Vespa T5.

It's usually cheaper to buy a new top end than buy a new piston than and have your cylinder bored out.

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Derrick
PostPosted: Sun Jun 17, 2007 2:06 pm  Reply with quote
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Please sell that scooter.
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agigau_k
PostPosted: Sun Jun 17, 2007 3:24 pm  Reply with quote
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I see three ports on the cylinder.
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Matty
PostPosted: Sun Jun 17, 2007 3:37 pm  Reply with quote
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Are any of those bridged? In reality it doesn't matter, they aren't performance engines to begin with. On a stock engine 3 vs. 5 cylinder ports isn't going to make any difference. Also people selling cheap asian restros are more than likely going to lie about few things.

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agigau_k
PostPosted: Sun Jun 17, 2007 4:43 pm  Reply with quote
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nope, no bridged ports only 3 ports. I got the bike from a guy in Nevada that was trying to get into the market of restoring old bikes. I don't believe the guy really knew what kind of a bike it was...Bajaj vs Piaggio Sprint. I think it is a Piaggio Sprint because all the parts I have been buying are for the Sprint and they match great. Also I don't see any mention anywhere of Bajaj making a Sprint Vespa type bike in 1971.
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Matty
PostPosted: Mon Jun 18, 2007 7:19 am  Reply with quote
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Yes Bajaj made Sprint copies in the 70's but it might newer and he titled as a 71 because that would make older than 25 years and easier to title.

I thought we covered this before but there is no way a guy in Nevada restored that. He bought restored scoots from somewhere in Asia to resell. If he told you he restored it he's lying. Yours looks much better than most though, and may very well be a good one but it wasn't restored here.

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nate
PostPosted: Mon Jun 18, 2007 7:32 am  Reply with quote
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Can't you just look up the VIN that's stamped into the body and engine and figure it out?
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agigau_k
PostPosted: Mon Jun 18, 2007 10:45 am  Reply with quote
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No VIN that I can find. There is only a 12 character frame number on the bike under the left cowl near the muffler with no preceeding VIB or VBB etc. I will try to locate the persons web address if you want to check it out.
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Matty
PostPosted: Mon Jun 18, 2007 11:10 am  Reply with quote
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agigau_k wrote:
I will try to locate the persons web address if you want to check it out.


yes please.

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Derrick
PostPosted: Mon Jun 18, 2007 11:30 am  Reply with quote
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I just want to know what a "back head gasket" is? Is it the opposite of the front head gasket or totally unrelated?

Can you blow the "back head gasket" if you go over 45 mph?
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agigau_k
PostPosted: Mon Jun 18, 2007 1:20 pm  Reply with quote
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I meant to say Base Gasket...at least that is what the shop manual calls it.
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Derrick
PostPosted: Mon Jun 18, 2007 2:02 pm  Reply with quote
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The base gasket can not leak exhaust - it is on the intake side only.
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John B.
PostPosted: Mon Jun 18, 2007 2:46 pm  Reply with quote
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never say never.
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Derrick
PostPosted: Mon Jun 18, 2007 4:23 pm  Reply with quote
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Never never never never!
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