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Post by CrazyKeewayGuy on Sept 16, 2020 23:53:36 GMT -5
As shown on the photo I can't reach higher rpm than 8800. I have no idea why. Is it due to wrong squish clerance, havy magneto or non ported engine? Had same problem with air cooled cylinder. My goal is to get it around 10k rpm. Any suggestions?
My setup: 1PE40QMB not ported
70cc LC cast cylinder from malossi
crankshaft RHQ MHR 39.2mm stroke for minarelli
LeoVince exhaust
dellorto 17.5mm carburetor
standard modified airbox with malossi sponge
stage6 intake with malossi reed valve
malossi overrange kit with delta cluch and 5g rollers
X K belt 17,5x8x815mm
stock stator with magneto for minarelli
racing ignition coil
unlocked ignition module
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Post by Zino on Sept 17, 2020 7:04:33 GMT -5
When you go down a steep hill do you still peak at 8800 Do you have lighter weights That pipe and cylinder should float to low to mid 9's for rpms .
Is the pipe unrestricted ?
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Post by pinkscoot on Sept 17, 2020 10:07:01 GMT -5
As Zino said it just needs lighter weights. Though it is a balancing act tuning a CVT. That said it only works if your CDI is un-restricted. Do the downhill test to see if it will rev higher.
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Post by CrazyKeewayGuy on Sept 17, 2020 22:34:36 GMT -5
Yes the pipe is unrestricted I even took the muffler out to see if there is a difference but there wasn't any at all. I'll try to go down hill, cause my CVT is right on spot I guess
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Post by christopher on Sept 19, 2020 10:24:47 GMT -5
You have an over range kit which equates to higher gearing. Sounds like the bike can't pull the higher gearing. Lighter weights will take longer to squish the front pulley halves together resulting in less overdrive and a higher rpm.
The other option is your carburetor jetting is way out most likely rich and it can't reach maximum rpm. What's your temperature gauge show for temperature at WOT something around 300°F is getting into the correct range without overheating.
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Post by CrazyKeewayGuy on Sept 19, 2020 13:20:56 GMT -5
I've changed rollers from 5g to 3,8g and central clutch spring from 3,8k to 4,7k and it hit around 9600 rpm so I'm happy with that but when I went to test ride to see for the first time the max speed I couldn't reach anything higher than 70km/h, from 0 to 50km/h it's like a rocket but above 50km/h it start to gain speed much slower a lot slower above 60km/h I did not even try to go faster cause I have only 200km on this engine. The question is, is there something with the gears, rear pulley or vario, cause I remember it going +95km/h on the old setup with the same gears but stock pulley and vario. On the vario I have still 10mm of belt travel to go. I have no idea what to do now cause it have plenty of power but the speed is waay to low.
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Post by aeroxbud on Sept 19, 2020 14:47:24 GMT -5
I would put it back to the CVT setup you had before. See if it's any different. I don't know what pipe you have, but the TT,ZX,ZX-R are losing power after about 8,500 rpm. Your bike will slow down notably after 25-30mph. The variator is maxed out. Only revs increasing can add speed. The engine is still not fully run in yet. You don't normally see the full potential to about 250-300 miles.
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Post by CrazyKeewayGuy on Sept 19, 2020 14:53:10 GMT -5
It hit above 10000 rpm (can't see how much exacly cause my tachometer is maxed out at 10000) but can't go faster than 45km/h it accelerate slowly and rev quickly, don't know why I gues it's something with vario cause after test ride it have still 10mm of belt travel to go. Without changes just how it was previously it rev max to 8800 rpm but it goes max 70km/h. Please help! Engine have just 200 km, have plenty of power but no speed.
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Post by CrazyKeewayGuy on Sept 19, 2020 14:56:41 GMT -5
this is my exhaust
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Post by aeroxbud on Sept 19, 2020 16:55:57 GMT -5
It sounds like the rollers are too light now. You want to be somewhere between 8,250 and 8,500 rpm once you have pulled off. The variator should hold it at that revs till about 30mph.
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Post by Zino on Sept 19, 2020 18:47:09 GMT -5
so we know that it is not your cdi holding you back because you went past 8800 with lighter rollers
10mm to go on the variator . That is a ton of gear ratio left on the table . That right there would probably get the whole 20 kmph back Can you do a sharpie marker from inner to outer edge on the back pulley. What size shims do you have in with the overrange .
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Post by CrazyKeewayGuy on Sept 19, 2020 22:13:13 GMT -5
I think that my variator bushing is little to long for my belt because I don't use any shims and rpm increase only when I put hard spring on pulley, rollers weight don't change rpm from what I've tested. I don't know it's first time that I have issue like that I think that squish clerance is to small but I'll check it tomorrow. Here is link to a video from test ride with 3,8g rollers and 4,7k spring. On the left is speed in km/h and right is rpm, on the very right is temp in celsius. www.youtube.com/watch?v=birw81t9uHM&feature=youtu.be
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Post by CrazyKeewayGuy on Sept 21, 2020 13:30:24 GMT -5
Tested 5g rollers with 4,7k spring - reving to 9200rpm going 50km/h
3,8g rollers with 4,7k spring - reving above 10000rpm going 40km/h
5g rollers with 3,7k spring - reving to 8800rpm going 70km/h
still 10mm fo belt travel to go on vario, did not checked belt travel on pulley yet
Does it go so slow because of low mileage of the engine of is there a problem with my setup cause I don't know anymore what to do 😔
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Post by aeroxbud on Sept 21, 2020 15:29:07 GMT -5
Why don't you try mixing the rollers. Giving you 4.4g. Like this 3.8,5,3.8,5 There is a massive difference in weight on the ones you have. That's why it's a good idea to buy a setup kit first.
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Post by Zino on Sept 22, 2020 7:52:35 GMT -5
If the 3.7 kg spring has no belt slip build around that one .
Run the rollers every other one like aerox bud says to see if that helps top speed . Then try one notch heavier take 6 pieces of aluminum foil of the same size that are about 1 gram in weight. Stuff the aluminum foil in every other 5 gram one and run down the road and check top speed If it is higher than try the aluminum foil in all of them .
Your weights may be too light to get full belt travel . I ran heavier weights with the Leo Vince in the upper 5 grams
You have 10 mm left on the outer edge of your front pulley does it get all the way to the bottom
If you could take pictures of your transmission at rest front and back so we can see where belt sits with the variator on and off . Also a picture of the rear pulley without the contra and clutch so we can see it at full rest with the belt at the very bottom and the front pulley pushed together with the belt pulley at the top .
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