kevvyd
2nd Class Ticket
Posts: 3
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Post by kevvyd on Feb 2, 2007 12:53:07 GMT
Had a scare last night...pootling along at 55 when the rear wheel locked and I skidded a long way hanging on for grim death!! Luckily I was on a straight....
Finally pulled the clutch in and it free wheeled to the side ...it then started fine and I crawled home!!
Any idea why the engine seized like this? Specs are 125 px with a 166 malossi kit on...It is a fuel/oil mix 33-1, I put 150ml of semi synthetic oil to 5 litres of petrol.
I have been shooting around on it for months quite happily on short journeys but have now lost confidence in it after the 15 mile trip yesterday !! Worried this will happen again...I Want to go on rallies this summer so need to sort this..any help much appreciated!
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stevem
2nd Class Ticket
Posts: 11
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Post by stevem on Feb 2, 2007 17:19:56 GMT
Based on my experiance with big bore kits on two strokes (bikes) they can prove to be troublesome.
I don't have any experiance with these kits on sooters so I could be talking twaddle!
As the barrel walls can be thinner heat build up can be an issue on a sustained "high" speed run, combine this with the loss of lubrication as you shut the throttle (and thus the fuel/oil mix) and the loss of cooling air from the fan as the engine slows and you have the potential for a seize.
Solutions?
Up the oil mix a bit,
Run a colder plug,
Dont shut off the throttle down hill or after a run.
Put the standard b&p back on.
Fit a larger standard engine.
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Post by Spence on Feb 2, 2007 19:48:34 GMT
Vespas weren't designed to be driven at speed for sustained periods, they were made for nipping about town on, so they're all susceptible to heat seizures if you thrash them.
A standard engine is much less likely to seize, but as soon as you start messing about with them and putting kits on them and the like, your chances of a heat seizure increase.
I agree with Steve's solutions, but a short term one is to listen for a pinking sound from your engine, and 'keep' your clutch when riding fast for any length of time, so that you can pull it in quickly if you do seize. If you catch it in time it's a case of stopping until it's cooled and the piston can move again, then taking it MUCH easier the rest of the way.
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kevvyd
2nd Class Ticket
Posts: 3
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Post by kevvyd on Feb 2, 2007 21:21:02 GMT
Nice one..thanks chaps,
Any suggestions how much more oil? I understood too much could be as bad as too little....Its been fine around town today...I will certainly take advice on board and probably look for a stock 200 when I pass my test....
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stevem
2nd Class Ticket
Posts: 11
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Post by stevem on Feb 3, 2007 19:10:56 GMT
Test? I can't think of any scooter that will push the bhp limit for learners. Your insurance company may not like it but there's no legal reason not to do it. Jeez, most 500 bikes are learnerr legal. Fit a Yamaha 350LC and have some fun!!! Yes I have been drinking.  ) |
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Post by dto79px on Feb 3, 2007 21:42:09 GMT
I have a 79px with DR180 kit fitted , i still run the fuel/oil at 50-1 . 33-1 could be to much oil which can cause it to seize , also with a malossi kit you should be using fully synthetic 2-stroke oil |
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Post by Rudi on Feb 4, 2007 10:41:50 GMT
150ml for 5 liters is 3% if im not mistaken
any added oil to gazoline reduces its octane
puting more oil than suggested, reduces octane even more
less octane causes knocking and bad fuel efficiency, and makes the engine work harder and hotter
this along with the high speed and maybe other factors that were mentioned here (hot plug) caused this. lucky for you , you can still write here.... could of ended else..
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