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Post by dubloman on Jul 24, 2017 14:37:24 GMT -5
Hi
Great advice indeed
Here is the report as we had a few problems
I have made a leakdown kit for under £10 so when I have time I will post a video and add the link here so others can do the same
The engine was taken out but before we did that we cleaned the carb and changed the vaccum pump, this helped slow down the fuel as it was only pumping the fuel it needed now.
We did the leakdown test and found that it had a hole (between the fins) in the block and as such it was pissing out from there. We had another block from another scooter and put that on, but the reason it was changed was that it had a few scores in the walls but we are getting about 85 psi on the compression test. When we changed the block (and gaskets) there was a small amount in the case but not a lot, the seals were fine and did not leak
We have not fitted the exhaust so after that we will fit the exhaust as it has been suggested that the loss in compression will prevent starting.
I will report back when we have got her running as it is only a matter of time.......Thanks for the help
Just for the record, with the exhaust off is 85 psi a good compression on a 50cc 2 stroke or bad, we do have another block we can put on but just wanted the feedback?
Cheers
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Post by dubloman on Jul 22, 2017 11:34:30 GMT -5
Hi
Geoff, I appreciate your help, we will pull the head and remove any and all the fluid that is in the case, I assume from the pictures you feel the seals are OK (not done one of these before) but the bearings are not that big of a job as we have pulled the engine out and it's on the bench, just need to know where the best place to get gaskets for the case and the seals, I have measured them and one side is 32mm (might be 31mm) x 20mm x 7mm (I think)the other side is 15mm x 25mm x 7mm (I have not taken them off yet to keep things clean.
At 3200 miles I assume the bearings are fine but is it worth changing them or leave them?
GSXRacer, I have not tried easy start or fuel directly into the pot as there is enough fuel in the pot as it has been flooding.
Any guidance is appreciated
Cheers
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Post by dubloman on Jul 22, 2017 9:41:29 GMT -5
I need help with these seals, they look to be moist but should they have oil on them? If not then they have both gone. I hope someone can tell me as I have no knowledge on two stroke engines Thanks
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Post by dubloman on Jul 22, 2017 7:39:57 GMT -5
We changed the vaccum pump, whilst it is not pumping out fuel as much as it did the fuel that is getting into the chamber is still not igniting, we have had the stator cover off to check the woodruff key, again it was a bit dirty but fine. We have stripped the carb, cleaned it via ultrasonic cleaner and put it back together. We have checked the reeds on this and they are metal so I can't see it being that.
We are getting a great spark, fuel and compression
It has been suggested by humanshield the crankcase seal may have dried up and will cause it to turn over but not start, who sells the seals and does anyone know the sizes before I pull them. If we changed them would it be worth doing the bearings at the same time and is there anything else on this engine that could stop it from running?
If we have the 3 things
Fuel Spark Compression
It should start, but the crank case seals is something I have not come across before. If you can advise I would be grateful or if there is something else in the engine I would like the help, the gaskets, bearings etc etc
Please let me know as I am about to pull the engine out and do the seals but whilst it's out!!!!!
Thanks
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Post by dubloman on Jul 20, 2017 16:11:33 GMT -5
Thanks Geoff
I don't know why it was parked up as that info is not available at the moment but I will ask
The starter clutch it nice and clean and I have 3, they are all doing the same thing, this could link into what humanshield has suggested that the crankseals have failed and it is moving a and the drive disc is not connecting as it should?
Who is the best company to get the seals and (if needed) the bearings
Thanks
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Post by dubloman on Jul 20, 2017 16:05:15 GMT -5
Thanks for that
I am a diesel fitter and HGV mechanic and MOT tester OLD School, but my son has the 50cc scooter and we are trying to sort it out
I don't have much experience of 2 strokes as I was in the army at an early age so missed that part of growing up, I have 4 stroke 125's and 250's so the 2 stroke is a mystery for me. I am learning fast as I had steered clear of bikes for 40+ years but as my kids ride I joined them, I still have the best bike though......lol
I will do it as a matter of course, if I am changing them is it worth changing the bearings at the same time, the engine has only done 3200 miles but as I said it has been stood in a garage for two years
I appreciate your help as I am a fish out of water with the 2 strokes
Thanks
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Post by dubloman on Jul 20, 2017 15:45:09 GMT -5
Not sure how crank seals would effect the starting of the engine
I am not dismissing the suggestion, I am much more interested in it than to do that
Can you tell me why the crank seals would cause the engine not to start, I might be being thick but if you could be so kind in how this effects the starting and how is this diagnosed
I look forward to your reply with great interest
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Post by dubloman on Jul 20, 2017 15:41:06 GMT -5
I have not but will add it to the list of things to check, didn't think of that one, would that have such an impact on her starting?.......I will check it
The redrec, would this have an issue on the starting? as I do have another one but want to ask has anyone had a starting issue that was caused by the redrec?
I have also found that the starter clutch does not appear to be engaging as it should but it is an intermittant issue. It was still turning over the bike up until an hour ago.
Thanks for the advice but if anyone has any additional ideas please let me know
Cheers
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Post by dubloman on Jul 20, 2017 14:49:34 GMT -5
I recently picked up a 50cc scooter that has been sat for 2 years, she turns over but won't start
Things I have done
good battery with booster charge
Fresh fuel with replacement fuel tank
we have good compression great spark (new plug) fuel is getting into the engine (as it's not starting its flooding) vaccum is working OK
We have changed the carb
checked the kill switch & changed
Cleaned the contact on the stator sender unit to make sure it has a good signal
We are going to check the woodruff key but I can't see it being that
We have taken the head off and the piston and rings are in great condition
If you have any ideas please make a suggestion
I am experienced but even those with experience get stumped and this is one of those occasions
Thanks
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