Madslynge
Newbie
- Joined
- Apr 7, 2019
- Messages
- 1
- Age
- 36
- Location
- Greenland
- Country
- Other
- Snowmobile
- Yamha Sr VIper 2015 162 mtx mcx 270 turbo
Hi guys. I'm all new to turbo 4-strokes, and noticed that i only would get around 8.000 rpm max with my 2015 MCX 270 Viper. From what i understand i should be up around 8.900-9.000 rpms ?? It pulls hard, up to that point.
Where should i start, and what should i look at ? Is it a clutching problem. From what i can see it has the Black Diamond clutching, i don't know much more than this. Any advice and pointers would be very appreicated.
Best regards
Where should i start, and what should i look at ? Is it a clutching problem. From what i can see it has the Black Diamond clutching, i don't know much more than this. Any advice and pointers would be very appreicated.
Best regards
YukonMP
TY 4 Stroke Guru
- Joined
- Dec 25, 2014
- Messages
- 835
- Location
- Yukon Territory
- Country
- Canada
- Snowmobile
- 2014 Venture MultiPurpose 2020 VK Professional ll
Post some pictures of your clutches and someone might be able to help. Also any other details like track length, type, studs, belt, gears.
- Joined
- Jun 1, 2004
- Messages
- 7,693
- Location
- sudbury on
- Country
- Canada
- Snowmobile
- 2016 apex xtx
2011 apex xtx
2009 phaser rtx/x
1997 et410t/r
1988 vk 540
1st thing you should do is ensure that you can turn the track by hand to eliminate any drag in the rear.
Pstn head
TY 4 Stroke Master
Track could be stretched.
PeeWee86
Extreme
You are correct in that you need more RPM. You say that you are new to turbo four strokes. If the snowmobile is new to you and you do not know any of the history of the clutch set up there are two possibilities. Either the belt/clutches have worn and they are no longer able to hold rpm or it’s possible that they were never setup right in the first place.
Start by cleaning the clutches and checking for any obviously worn components, sacked or broken springs, etc. Verify that the driven clutch has the proper pretension wrap. I have seen people that have taken them apart and don’t know how to put them back together correctly. I would start with a 3/3 or a 6/1 wrap. Install a brand new belt and take the time to break it in. You can gain RPM by reducing weight of your primary clutch arms, decreasing helix angle, or trying stiffer springs. It is hard give specific recommendations without knowing exactly what you have now.
Start by cleaning the clutches and checking for any obviously worn components, sacked or broken springs, etc. Verify that the driven clutch has the proper pretension wrap. I have seen people that have taken them apart and don’t know how to put them back together correctly. I would start with a 3/3 or a 6/1 wrap. Install a brand new belt and take the time to break it in. You can gain RPM by reducing weight of your primary clutch arms, decreasing helix angle, or trying stiffer springs. It is hard give specific recommendations without knowing exactly what you have now.
