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Post by hippo008 on Oct 20, 2020 9:03:42 GMT -5
I'll probably just end up removing electric start. I hate to remove it but I want that greater belt travel to take advantage of the Multivar
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Post by Steve B on Oct 20, 2020 9:46:24 GMT -5
You will notice a big difference when taking off. You won't regret it.
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Post by hippo008 on Oct 22, 2020 16:17:20 GMT -5
The exhaust bracket came today. Fired up the scooter with a 110 main jet. Way too big a main jet. Scooter won't rev at all, ill have to go back down.
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Post by Steve B on Oct 22, 2020 16:21:41 GMT -5
Hippo, You're probably gonna be in the #95 MJ range.
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Post by hippo008 on Oct 22, 2020 16:59:02 GMT -5
Hippo, You're probably gonna be in the #95 MJ range. Im very nervous to seize something, I dont want to have an issue this far in. Ill go to a 100 jet and try that.
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Post by Steve B on Oct 22, 2020 19:34:51 GMT -5
Hippo, You're probably gonna be in the #95 MJ range. Im very nervous to seize something, I dont want to have an issue this far in. Ill go to a 100 jet and try that.
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Post by Steve B on Oct 22, 2020 19:38:47 GMT -5
You always want to start high and work you're way down when jetting. So go from "I.E." 105 to 102 to 100 to 98 to whenever it runs perfect to you. I think it's gonna be around #95 range, when said and done.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Oct 22, 2020 20:13:53 GMT -5
We have very similar builds, I'm running a 104MJ (still a little on the lean side, weather has been shite haven't had much chance to mess w/ it other than go up from a 102) . Did you remove the snorkel on the airbox, enlarge the snorkel hole? Do you have a reliable temp sensor, that'll let you know if your in seize territory?
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Post by hippo008 on Oct 26, 2020 17:06:28 GMT -5
So I go to start the scooter today and nothing, nada, zilch. I tried cranking it over with the starter, kicked it 30+ times, really gave her the business. No dice. I went into diagnostic mode. Spark is good. Jumped a good distance across a spark checker. Plug was wet and oily. Iginition is bone stock. No fancy PVL ignition. Carb is getting fuel, fuel bowl was full when I went and cleaned the whole carb. Total dissasembly and reassembly and a bath in Berryman carb cleaner. Carb was clean as a whistle. I didn't have a compression tester but liberated a good Snap-on one from work. Compression came up as 90psi~ . I went whole hog. Pulled the engine and took the cylinder off. The bore is A+, nothing wrong with it. Same with the piston and rings. No stuck rings and no scoring anywhere to be seen. Did another compression test after a thorough inspection and reassembly. 90psi again. Huh? I never did a rigorous case leakdown test so I went and make a leak tester. Plugged up the intake and exhaust and it wouldn't hold a single pound of pressure. I was spraying and spraying but no visible leaks? I'm thinking a crank seal is the source of the leak. The only thing I haven't checked are my reeds. They are brand new Polini carbon reeds and I figure they are OK. Am I missing something here? Whats causing this no start condition? I did the idiot checks. Kill switch was not on. Gas is good albeit very oil rich, probably like 30:1. Im going to purchase new crank seals and toss those in. Any ideas here fellas? EDIT: When it idled last week it was a pain to start but idled fine and clearly wasn't suffering from a vacuum leak. No high idle or hanging idle. Carb adjustments were effective.
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Post by aeroxbud on Oct 26, 2020 17:25:22 GMT -5
Could be reeds. Did you actually check your leak tester to make sure it holds pressure?
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Oct 26, 2020 17:42:47 GMT -5
If it's leaking that fast there should be a noticeable hiss from where ever it's leaking.
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Post by hippo008 on Oct 26, 2020 18:13:10 GMT -5
If it's leaking that fast there should be a noticeable hiss from where ever it's leaking. There was a hiss coming from what I thought was one of the crankshaft oil seals. I didnt check the reeds but I will tomorrow. I didnt check the leak tester but all it consists of is an aluminum plate and rubber bolted over the exhaust and a boot with a Shrader valve both threaded and epoxied in for the intake. It doesnt seem to me like a place leaks would happen but I sure will test it! Maybe I am misunderstanding the dynamics of a 2 stroke here, but wouldnt a crankcase leak not contribute to low compression anyways? Once the piston passes both the intake, exhaust and boost port shouldnt the blowdown area be a sealed environment where compression happens? Hmmm
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Post by hippo008 on Oct 26, 2020 20:40:30 GMT -5
Update: I did not pass the idiot checks. The spark plug was not inserted when I did my initial leakdown test. I put in the plug and presto she sort of holds pressure. There is a leak above the reedcage but under the intake manifold. Nothing a little gasket and some RTV cant fix. Tookout the reedcage and the reeds are mint. I tested my little leakdown tester plug and shes airtight. No leakin' here. Im going to do another test after new intake gaskets and see whats up. Sadly none of this solves my compression issues. I checked that all the head gaskets were seated properly and they all were. No cylinder gases were making their way into the coolant system. Im left scratching my head at the 90psi number and why this thing wouldnt start. Just for additional posterity im ditching the vacuum fuel petcock. I just dont trust the thing. Im swapping it for a nice manual version.
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df41590
Scoot Enthusiast
Posts: 285
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Post by df41590 on Oct 26, 2020 21:52:41 GMT -5
Is that a long hosed automotive compression tester? They're not that accurate for these little engines, either way 90psi won't stop it from starting. Did you try starting fluid or a squirt of fuel in the cylinder?
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Post by 808ministroke on Oct 27, 2020 5:45:14 GMT -5
I agree 90 psi may be a hard start but not a no start. I would also vote to try starter fluid or may be flooded try kicking it a few times with the throttle open to get some air in there low compression may be just cuz its brand new and not broke in.
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