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Hi all, I am new to this forum so forgive me if this has been asked already! I have a HPI Trophy 3.5. So, after installing a 3 piece clutch (abisma did a kit so opted for that for the time being) and the buggy not being ran for some time I decided to give it a little bash in the garden. Only issue is when cold, the buggy idle's perfectly fine, once it starts to get warm you can physically see the car trying to edge forward and when fully warm and the buggy has been ran around for a little while it doesn't idle at a stand still it constantly wants to move (unless applying the brakes). The gap is at 1mm or so too! Also when coming off the accelerator it bogs and when it is idling (when warm) sounds very lean although all the needles are almost factory. I'm so baffled as to what I need to do to ensure it idles correctly. I have read many different threads (not being a member) and now very confused. Can someone point me in the right direction?!

This car was a pre-owned HPI Trophy, that I expected to have a 3.5 (.21) engine, but on closer inspection most of the 3.5s have a black cooling head where this one is purple which is more in keeping with the 4.6, it is low on power and I want to rebuild it but with what parts? There are no size markings anywhere on the casings.

Right I'm in need of some help/info regarding my tyre and even wheel choices for my HPI Trophy Truggy 4.6 as I'm struggling a bit with lack of information out there and a lot of incorrect info as well... First thing is the size of the wheels, I've got the standard 7 Spoke Chrome wheels that come with the Truggy and I've measured them and they are approximately 4" across and 2" in width. Now this is a bit odd as almost all of the info out there seems to go on about Truggy wheels being 3.2" and 3.8", so what's the crack? Are the Trophy wheels 4" or a very generous 3.8" and is this a standard? If so why are all the wheels and tyres I come across for Truggys generally 3.2"? I've currently got the HPI Shredder tyres on but am looking for something a bit more suited to off road use (grass, mud etc). The Proline Badlands seem to be well regarded but when looking at the 3.8" version they have massive side-walls and I was hoping for something more low profile but with a decent tread as wont a 3.8" tyre with a large side-wall end up being too big for a Truggy and more suited to a MT? Can you get low profile off road 3.8-4.0" tyres? Or is it the case that the 3.8-4.0" wheels on the Trophy Truggy are a bit of an anomaly and actually I should be looking at getting some 3.2" wheels and using tyres made for them which have a much larger side-wall such as the HPI Aggressor Tyres (#4892)? Also if I should go for a 3.2" wheel tyre combo what's happened to the Badlands in a 3.2" fitment?? Cheers Ryan